VulnSocial

CVE-2024-20353Disclosure(cisco / adaptive_security_appliance_software)

LOWCVSS 8.6 · HIGHCISA KEV

Exploitation ongoing with high activity in latest observed window (4 mentions)

Immediate actions

  • Prioritize remediation for cisco adaptive_security_appliance_software systems immediately
  • Assume compromise if assets are exposed
  • Track advisory updates for patch or workaround availability

Recommended action window: Immediate (within 24h)

NVD description

A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to incomplete error checking when parsing an HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.

cisco CVEsBack to dashboard
3.5/ 10 priority

Sources & remediation

Listed in the CISA Known Exploited Vulnerabilities catalog. Federal remediation due date: 2024-05-01. Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Exploit / PoC references
Vendor / third-party advisories
Other references
Weakness type (CWE)
CWE-835

Priority

LOW

Exploitation

ACTIVE

PoC

YES

Patch

NONE

Momentum

STABLE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • adaptive_security_appliance_software
  • secure_firewall_threat_defense

Threat summary

  • Active exploitation appears in 2 classified signals
  • 5 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Active exploitation reported across 2 signals
  • Technical details provided in 2 signals
  • Disclosure: 2 classified signals
  • General: 1 classified signal
  • Peaked at 4 mentions on most recent observed day (2026-05-03)
  • 5 total mentions across 2 days

Affected systems

Vendors
cisco
Products
adaptive_security_appliance_softwaresecure_firewall_threat_defense

267 versions affected across 2 products

Deep dive

Activity timeline5 mentions / 2d
01234Mentions · 2026-03-24: 1Mentions · 2026-05-03: 4Active Exploitation · 2026-05-03: 2Technical Details · 2026-03-24: 1Technical Details · 2026-05-03: 103-2405-03
Signal classification3 categories
Disclosure
240.0%
Active Exploitation
240.0%
General
120.0%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-03-241
Disclosure1
2026-05-034
Active Exploitation2Disclosure1General1
Full discourse5 posts
  • CVETrends@CVEShield
    General

    Top 5 Trending CVEs: 1 - CVE-2026-31431 2 - CVE-2026-41940 3 - CVE-2026-3910 4 - CVE-2024-20359 5 - CVE-2024-20353 #cve #cvetrends #cveshield #cybersecurity https://www.cveshield.com/dashboard

    Post summary

    The content simply lists five trending CVEs without providing any additional information about exploits, patches, or technical details.

    01031255
    1.7K followersView on X
  • Lyrie.ai@lyrie_ai
    Disclosure

    CVE-2024-20353: Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD) contain an infinite loop vulnerability that can lead to remote denial of service condition.

    Post summary

    The post announces CVE-2024-20353, an infinite-loop induced remote denial of service vulnerability affecting Cisco ASA and FTD, without providing exploit details or mitigation information.

    10020138
    308 followersView on X
  • Lyrie.ai@lyrie_ai
    Active Exploitation

    CVE-2024-20353 added to CISA KEV: Cisco Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)

    Post summary

    CVE-2024-20353 has been added to the CISA KEV list for Cisco ASA and FTD, indicating that the vulnerability is considered to be actively exploited.

    1000093
    152 followersView on X
  • Lyrie.ai@lyrie_ai
    Active Exploitation

    https://research.lyrie.ai/research/active-exploit-cve-2024-20353-adaptive-security-appliance-asa-and-firepower-thre #lyrie #cybersecurity #CVE #threatintel #zerodayattack

    Post summary

    The snippet points to a blog post that claims active exploitation of CVE-2024-20353 on Adaptive Security Appliance and FirePower devices, but contains no technical, PoC, or patch details.

    0000030
    152 followersView on X
  • DailyCVE@dailycve
    Disclosure

    🔴 #Cisco FMC, Insecure Deserialization, #CVE-2024-20353 (Critical) https://dailycve.com/cisco-fmc-insecure-deserialization-cve-2024-20353-critical/

    Post summary

    The tweet announces the discovery of a critical insecure deserialization vulnerability (CVE-2024-20353) affecting Cisco FMC.

    0000050
    173 followersView on X
CPE platform detail267 entries

267 of 267 entries

PartVendorProductVersionTarget SWTarget HW
OSciscoadaptive_security_appliance_software9.12.1--
OSciscoadaptive_security_appliance_software9.12.1.2--
OSciscoadaptive_security_appliance_software9.12.1.3--
OSciscoadaptive_security_appliance_software9.12.2--
OSciscoadaptive_security_appliance_software9.12.2.1--
OSciscoadaptive_security_appliance_software9.12.2.4--
OSciscoadaptive_security_appliance_software9.12.2.5--
OSciscoadaptive_security_appliance_software9.12.2.9--
OSciscoadaptive_security_appliance_software9.12.3--
OSciscoadaptive_security_appliance_software9.12.3.12--
OSciscoadaptive_security_appliance_software9.12.3.2--
OSciscoadaptive_security_appliance_software9.12.3.7--
OSciscoadaptive_security_appliance_software9.12.3.9--
OSciscoadaptive_security_appliance_software9.12.4--
OSciscoadaptive_security_appliance_software9.12.4.10--
OSciscoadaptive_security_appliance_software9.12.4.13--
OSciscoadaptive_security_appliance_software9.12.4.18--
OSciscoadaptive_security_appliance_software9.12.4.2--
OSciscoadaptive_security_appliance_software9.12.4.24--
OSciscoadaptive_security_appliance_software9.12.4.26--
OSciscoadaptive_security_appliance_software9.12.4.29--
OSciscoadaptive_security_appliance_software9.12.4.30--
OSciscoadaptive_security_appliance_software9.12.4.35--
OSciscoadaptive_security_appliance_software9.12.4.37--
OSciscoadaptive_security_appliance_software9.12.4.38--
OSciscoadaptive_security_appliance_software9.12.4.39--
OSciscoadaptive_security_appliance_software9.12.4.4--
OSciscoadaptive_security_appliance_software9.12.4.40--
OSciscoadaptive_security_appliance_software9.12.4.41--
OSciscoadaptive_security_appliance_software9.12.4.47--
OSciscoadaptive_security_appliance_software9.12.4.48--
OSciscoadaptive_security_appliance_software9.12.4.50--
OSciscoadaptive_security_appliance_software9.12.4.52--
OSciscoadaptive_security_appliance_software9.12.4.54--
OSciscoadaptive_security_appliance_software9.12.4.55--
OSciscoadaptive_security_appliance_software9.12.4.56--
OSciscoadaptive_security_appliance_software9.12.4.58--
OSciscoadaptive_security_appliance_software9.12.4.62--
OSciscoadaptive_security_appliance_software9.12.4.65--
OSciscoadaptive_security_appliance_software9.12.4.7--
OSciscoadaptive_security_appliance_software9.12.4.8--
OSciscoadaptive_security_appliance_software9.14.1--
OSciscoadaptive_security_appliance_software9.14.1.10--
OSciscoadaptive_security_appliance_software9.14.1.15--
OSciscoadaptive_security_appliance_software9.14.1.19--
OSciscoadaptive_security_appliance_software9.14.1.30--
OSciscoadaptive_security_appliance_software9.14.1.6--
OSciscoadaptive_security_appliance_software9.14.2--
OSciscoadaptive_security_appliance_software9.14.2.13--
OSciscoadaptive_security_appliance_software9.14.2.15--
OSciscoadaptive_security_appliance_software9.14.2.4--
OSciscoadaptive_security_appliance_software9.14.2.8--
OSciscoadaptive_security_appliance_software9.14.3--
OSciscoadaptive_security_appliance_software9.14.3.1--
OSciscoadaptive_security_appliance_software9.14.3.11--
OSciscoadaptive_security_appliance_software9.14.3.13--
OSciscoadaptive_security_appliance_software9.14.3.15--
OSciscoadaptive_security_appliance_software9.14.3.18--
OSciscoadaptive_security_appliance_software9.14.3.9--
OSciscoadaptive_security_appliance_software9.14.4--
OSciscoadaptive_security_appliance_software9.14.4.12--
OSciscoadaptive_security_appliance_software9.14.4.13--
OSciscoadaptive_security_appliance_software9.14.4.14--
OSciscoadaptive_security_appliance_software9.14.4.15--
OSciscoadaptive_security_appliance_software9.14.4.17--
OSciscoadaptive_security_appliance_software9.14.4.22--
OSciscoadaptive_security_appliance_software9.14.4.23--
OSciscoadaptive_security_appliance_software9.14.4.6--
OSciscoadaptive_security_appliance_software9.14.4.7--
OSciscoadaptive_security_appliance_software9.15.1--
OSciscoadaptive_security_appliance_software9.15.1.1--
OSciscoadaptive_security_appliance_software9.15.1.10--
OSciscoadaptive_security_appliance_software9.15.1.15--
OSciscoadaptive_security_appliance_software9.15.1.16--
OSciscoadaptive_security_appliance_software9.15.1.17--
OSciscoadaptive_security_appliance_software9.15.1.21--
OSciscoadaptive_security_appliance_software9.15.1.7--
OSciscoadaptive_security_appliance_software9.16.1--
OSciscoadaptive_security_appliance_software9.16.1.28--
OSciscoadaptive_security_appliance_software9.16.2--
OSciscoadaptive_security_appliance_software9.16.2.11--
OSciscoadaptive_security_appliance_software9.16.2.13--
OSciscoadaptive_security_appliance_software9.16.2.14--
OSciscoadaptive_security_appliance_software9.16.2.3--
OSciscoadaptive_security_appliance_software9.16.2.7--
OSciscoadaptive_security_appliance_software9.16.3--
OSciscoadaptive_security_appliance_software9.16.3.14--
OSciscoadaptive_security_appliance_software9.16.3.15--
OSciscoadaptive_security_appliance_software9.16.3.19--
OSciscoadaptive_security_appliance_software9.16.3.23--
OSciscoadaptive_security_appliance_software9.16.3.3--
OSciscoadaptive_security_appliance_software9.16.4--
OSciscoadaptive_security_appliance_software9.16.4.14--
OSciscoadaptive_security_appliance_software9.16.4.18--
OSciscoadaptive_security_appliance_software9.16.4.19--
OSciscoadaptive_security_appliance_software9.16.4.27--
OSciscoadaptive_security_appliance_software9.16.4.38--
OSciscoadaptive_security_appliance_software9.16.4.39--
OSciscoadaptive_security_appliance_software9.16.4.42--
OSciscoadaptive_security_appliance_software9.16.4.48--
OSciscoadaptive_security_appliance_software9.16.4.55--
OSciscoadaptive_security_appliance_software9.16.4.9--
OSciscoadaptive_security_appliance_software9.17.1--
OSciscoadaptive_security_appliance_software9.17.1.10--
OSciscoadaptive_security_appliance_software9.17.1.11--
OSciscoadaptive_security_appliance_software9.17.1.13--
OSciscoadaptive_security_appliance_software9.17.1.15--
OSciscoadaptive_security_appliance_software9.17.1.20--
OSciscoadaptive_security_appliance_software9.17.1.30--
OSciscoadaptive_security_appliance_software9.17.1.33--
OSciscoadaptive_security_appliance_software9.17.1.7--
OSciscoadaptive_security_appliance_software9.17.1.9--
OSciscoadaptive_security_appliance_software9.18.1--
OSciscoadaptive_security_appliance_software9.18.1.3--
OSciscoadaptive_security_appliance_software9.18.2--
OSciscoadaptive_security_appliance_software9.18.2.5--
OSciscoadaptive_security_appliance_software9.18.2.7--
OSciscoadaptive_security_appliance_software9.18.2.8--
OSciscoadaptive_security_appliance_software9.18.3--
OSciscoadaptive_security_appliance_software9.18.3.39--
OSciscoadaptive_security_appliance_software9.18.3.46--
OSciscoadaptive_security_appliance_software9.18.3.53--
OSciscoadaptive_security_appliance_software9.18.3.55--
OSciscoadaptive_security_appliance_software9.18.3.56--
OSciscoadaptive_security_appliance_software9.18.4--
OSciscoadaptive_security_appliance_software9.18.4.5--
OSciscoadaptive_security_appliance_software9.18.4.8--
OSciscoadaptive_security_appliance_software9.19.1--
OSciscoadaptive_security_appliance_software9.19.1.12--
OSciscoadaptive_security_appliance_software9.19.1.18--
OSciscoadaptive_security_appliance_software9.19.1.22--
OSciscoadaptive_security_appliance_software9.19.1.24--
OSciscoadaptive_security_appliance_software9.19.1.27--
OSciscoadaptive_security_appliance_software9.19.1.5--
OSciscoadaptive_security_appliance_software9.19.1.9--
OSciscoadaptive_security_appliance_software9.20.1--
OSciscoadaptive_security_appliance_software9.20.1.5--
OSciscoadaptive_security_appliance_software9.20.2--
OSciscoadaptive_security_appliance_software9.8.1--
OSciscoadaptive_security_appliance_software9.8.1.5--
OSciscoadaptive_security_appliance_software9.8.1.7--
OSciscoadaptive_security_appliance_software9.8.2--
OSciscoadaptive_security_appliance_software9.8.2.14--
OSciscoadaptive_security_appliance_software9.8.2.15--
OSciscoadaptive_security_appliance_software9.8.2.17--
OSciscoadaptive_security_appliance_software9.8.2.20--
OSciscoadaptive_security_appliance_software9.8.2.24--
OSciscoadaptive_security_appliance_software9.8.2.26--
OSciscoadaptive_security_appliance_software9.8.2.28--
OSciscoadaptive_security_appliance_software9.8.2.33--
OSciscoadaptive_security_appliance_software9.8.2.35--
OSciscoadaptive_security_appliance_software9.8.2.38--
OSciscoadaptive_security_appliance_software9.8.2.8--
OSciscoadaptive_security_appliance_software9.8.3--
OSciscoadaptive_security_appliance_software9.8.3.11--
OSciscoadaptive_security_appliance_software9.8.3.14--
OSciscoadaptive_security_appliance_software9.8.3.16--
OSciscoadaptive_security_appliance_software9.8.3.18--
OSciscoadaptive_security_appliance_software9.8.3.21--
OSciscoadaptive_security_appliance_software9.8.3.26--
OSciscoadaptive_security_appliance_software9.8.3.29--
OSciscoadaptive_security_appliance_software9.8.3.8--
OSciscoadaptive_security_appliance_software9.8.4--
OSciscoadaptive_security_appliance_software9.8.4.10--
OSciscoadaptive_security_appliance_software9.8.4.12--
OSciscoadaptive_security_appliance_software9.8.4.15--
OSciscoadaptive_security_appliance_software9.8.4.17--
OSciscoadaptive_security_appliance_software9.8.4.20--
OSciscoadaptive_security_appliance_software9.8.4.22--
OSciscoadaptive_security_appliance_software9.8.4.25--
OSciscoadaptive_security_appliance_software9.8.4.26--
OSciscoadaptive_security_appliance_software9.8.4.29--
OSciscoadaptive_security_appliance_software9.8.4.3--
OSciscoadaptive_security_appliance_software9.8.4.32--
OSciscoadaptive_security_appliance_software9.8.4.33--
OSciscoadaptive_security_appliance_software9.8.4.34--
OSciscoadaptive_security_appliance_software9.8.4.35--
OSciscoadaptive_security_appliance_software9.8.4.39--
OSciscoadaptive_security_appliance_software9.8.4.40--
OSciscoadaptive_security_appliance_software9.8.4.41--
OSciscoadaptive_security_appliance_software9.8.4.43--
OSciscoadaptive_security_appliance_software9.8.4.44--
OSciscoadaptive_security_appliance_software9.8.4.45--
OSciscoadaptive_security_appliance_software9.8.4.46--
OSciscoadaptive_security_appliance_software9.8.4.48--
OSciscoadaptive_security_appliance_software9.8.4.7--
OSciscoadaptive_security_appliance_software9.8.4.8--
Appciscosecure_firewall_threat_defense6.2.3--
Appciscosecure_firewall_threat_defense6.2.3.1--
Appciscosecure_firewall_threat_defense6.2.3.10--
Appciscosecure_firewall_threat_defense6.2.3.11--
Appciscosecure_firewall_threat_defense6.2.3.12--
Appciscosecure_firewall_threat_defense6.2.3.13--
Appciscosecure_firewall_threat_defense6.2.3.14--
Appciscosecure_firewall_threat_defense6.2.3.15--
Appciscosecure_firewall_threat_defense6.2.3.16--
Appciscosecure_firewall_threat_defense6.2.3.17--
Appciscosecure_firewall_threat_defense6.2.3.18--
Appciscosecure_firewall_threat_defense6.2.3.2--
Appciscosecure_firewall_threat_defense6.2.3.3--
Appciscosecure_firewall_threat_defense6.2.3.4--
Appciscosecure_firewall_threat_defense6.2.3.5--
Appciscosecure_firewall_threat_defense6.2.3.6--
Appciscosecure_firewall_threat_defense6.2.3.7--
Appciscosecure_firewall_threat_defense6.2.3.8--
Appciscosecure_firewall_threat_defense6.2.3.9--
Appciscosecure_firewall_threat_defense6.4.0--
Appciscosecure_firewall_threat_defense6.4.0.1--
Appciscosecure_firewall_threat_defense6.4.0.10--
Appciscosecure_firewall_threat_defense6.4.0.11--
Appciscosecure_firewall_threat_defense6.4.0.12--
Appciscosecure_firewall_threat_defense6.4.0.13--
Appciscosecure_firewall_threat_defense6.4.0.14--
Appciscosecure_firewall_threat_defense6.4.0.15--
Appciscosecure_firewall_threat_defense6.4.0.16--
Appciscosecure_firewall_threat_defense6.4.0.17--
Appciscosecure_firewall_threat_defense6.4.0.2--
Appciscosecure_firewall_threat_defense6.4.0.3--
Appciscosecure_firewall_threat_defense6.4.0.4--
Appciscosecure_firewall_threat_defense6.4.0.5--
Appciscosecure_firewall_threat_defense6.4.0.6--
Appciscosecure_firewall_threat_defense6.4.0.7--
Appciscosecure_firewall_threat_defense6.4.0.8--
Appciscosecure_firewall_threat_defense6.4.0.9--
Appciscosecure_firewall_threat_defense6.6.0--
Appciscosecure_firewall_threat_defense6.6.0.1--
Appciscosecure_firewall_threat_defense6.6.1--
Appciscosecure_firewall_threat_defense6.6.3--
Appciscosecure_firewall_threat_defense6.6.4--
Appciscosecure_firewall_threat_defense6.6.5--
Appciscosecure_firewall_threat_defense6.6.5.1--
Appciscosecure_firewall_threat_defense6.6.5.2--
Appciscosecure_firewall_threat_defense6.6.7--
Appciscosecure_firewall_threat_defense6.6.7.1--
Appciscosecure_firewall_threat_defense6.7.0--
Appciscosecure_firewall_threat_defense6.7.0.1--
Appciscosecure_firewall_threat_defense6.7.0.2--
Appciscosecure_firewall_threat_defense6.7.0.3--
Appciscosecure_firewall_threat_defense7.0.0--
Appciscosecure_firewall_threat_defense7.0.0.1--
Appciscosecure_firewall_threat_defense7.0.1--
Appciscosecure_firewall_threat_defense7.0.1.1--
Appciscosecure_firewall_threat_defense7.0.2--
Appciscosecure_firewall_threat_defense7.0.2.1--
Appciscosecure_firewall_threat_defense7.0.3--
Appciscosecure_firewall_threat_defense7.0.4--
Appciscosecure_firewall_threat_defense7.0.5--
Appciscosecure_firewall_threat_defense7.0.6--
Appciscosecure_firewall_threat_defense7.0.6.1--
Appciscosecure_firewall_threat_defense7.1.0--
Appciscosecure_firewall_threat_defense7.1.0.1--
Appciscosecure_firewall_threat_defense7.1.0.2--
Appciscosecure_firewall_threat_defense7.1.0.3--
Appciscosecure_firewall_threat_defense7.2.0--
Appciscosecure_firewall_threat_defense7.2.0.1--
Appciscosecure_firewall_threat_defense7.2.1--
Appciscosecure_firewall_threat_defense7.2.2--
Appciscosecure_firewall_threat_defense7.2.3--
Appciscosecure_firewall_threat_defense7.2.4--
Appciscosecure_firewall_threat_defense7.2.4.1--
Appciscosecure_firewall_threat_defense7.2.5--
Appciscosecure_firewall_threat_defense7.2.5.1--
Appciscosecure_firewall_threat_defense7.3.0--
Appciscosecure_firewall_threat_defense7.3.1--
Appciscosecure_firewall_threat_defense7.3.1.1--
Appciscosecure_firewall_threat_defense7.4.0--
Appciscosecure_firewall_threat_defense7.4.1--

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