CVE-2026-20021Disclosure(cisco / adaptive_security_appliance_software)

LOWCVSS 4.3 · MEDIUM

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, adjacent attacker to exhaust memory on an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to improperly validating input by the OSPF protocol when parsing packets. An attacker could exploit this vulnerability by by sending crafted OSPF packets to an affected device. A successful exploit could allow the attacker to exhaust memory on the affected device, resulting in a DoS condition.

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0.0/ 10 priority

Sources & remediation

Vendor / third-party advisories

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-ospf-ZH8PhbSW

Weakness type (CWE)

CWE-401

Priority

LOW

Exploitation

NONE

PoC

NONE

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

2 mentions across 2 observed days
Momentum state: stable

What's happening

Technical details provided in 1 signal
Disclosure: 2 classified signals
Peaked 1d ago at 1 mentions (2026-03-04); latest day: 1
2 total mentions across 2 days

Affected systems

Vendors

cisco

Products

adaptive_security_appliance_softwaresecure_firewall_threat_defense

76 versions affected across 2 products

Deep dive

Activity timeline2 mentions / 2d

Signal classification1 categories

Disclosure

2100.0%

Referenced assets2 URLs

By indicator

Full discourse2 posts

Vulmon Vulnerability Feed@VulmonFeeds220d
Disclosure
CVE-2026-20021 OSPF Protocol Memory Exhaustion Vulnerability in Cisco Secure Firewall Software https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-20021
Post summary
The text merely announces a Cisco Secure Firewall OSPF memory exhaustion vulnerability (CVE‑2026‑20021) without providing PoC, exploitation details, patches, or evidence of active attacks.
0000058
4.0K followersView on X
CVE@CVEnew220d
Disclosure
CVE-2026-20021 A vulnerability in the OSPF protocol of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could… https://www.cve.org/CVERecord?id=CVE-2026-20021
Post summary
The tweet announces the new CVE‑2026‑20021 regarding OSPF in Cisco ASA/FTD, but provides no further technical details, PoC, or exploit information.
0000084
56.6K followersView on X

CPE platform detail77 entries

Part:

Vendor:

Product:

Version:

Target SW:

Target HW:

77 of 77 entries

Part	Vendor	Product	Version	Target SW	Target HW
OS	cisco	adaptive_security_appliance_software	-	-	-
App	cisco	secure_firewall_threat_defense	6.4.0	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.1	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.10	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.11	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.12	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.13	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.14	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.15	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.16	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.17	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.18	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.2	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.3	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.4	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.5	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.6	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.7	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.8	-	-
App	cisco	secure_firewall_threat_defense	6.4.0.9	-	-
App	cisco	secure_firewall_threat_defense	7.0.0	-	-
App	cisco	secure_firewall_threat_defense	7.0.0.1	-	-
App	cisco	secure_firewall_threat_defense	7.0.1	-	-
App	cisco	secure_firewall_threat_defense	7.0.1.1	-	-
App	cisco	secure_firewall_threat_defense	7.0.2	-	-
App	cisco	secure_firewall_threat_defense	7.0.2.1	-	-
App	cisco	secure_firewall_threat_defense	7.0.3	-	-
App	cisco	secure_firewall_threat_defense	7.0.4	-	-
App	cisco	secure_firewall_threat_defense	7.0.5	-	-
App	cisco	secure_firewall_threat_defense	7.0.6	-	-
App	cisco	secure_firewall_threat_defense	7.0.6.1	-	-
App	cisco	secure_firewall_threat_defense	7.0.6.2	-	-
App	cisco	secure_firewall_threat_defense	7.0.6.3	-	-
App	cisco	secure_firewall_threat_defense	7.0.7	-	-
App	cisco	secure_firewall_threat_defense	7.0.8	-	-
App	cisco	secure_firewall_threat_defense	7.0.8.1	-	-
App	cisco	secure_firewall_threat_defense	7.1.0	-	-
App	cisco	secure_firewall_threat_defense	7.1.0.1	-	-
App	cisco	secure_firewall_threat_defense	7.1.0.2	-	-
App	cisco	secure_firewall_threat_defense	7.1.0.3	-	-
App	cisco	secure_firewall_threat_defense	7.2.0	-	-
App	cisco	secure_firewall_threat_defense	7.2.0.1	-	-
App	cisco	secure_firewall_threat_defense	7.2.1	-	-
App	cisco	secure_firewall_threat_defense	7.2.10	-	-
App	cisco	secure_firewall_threat_defense	7.2.10.2	-	-
App	cisco	secure_firewall_threat_defense	7.2.2	-	-
App	cisco	secure_firewall_threat_defense	7.2.3	-	-
App	cisco	secure_firewall_threat_defense	7.2.4	-	-
App	cisco	secure_firewall_threat_defense	7.2.4.1	-	-
App	cisco	secure_firewall_threat_defense	7.2.5	-	-
App	cisco	secure_firewall_threat_defense	7.2.5.1	-	-
App	cisco	secure_firewall_threat_defense	7.2.5.2	-	-
App	cisco	secure_firewall_threat_defense	7.2.6	-	-
App	cisco	secure_firewall_threat_defense	7.2.7	-	-
App	cisco	secure_firewall_threat_defense	7.2.8	-	-
App	cisco	secure_firewall_threat_defense	7.2.8.1	-	-
App	cisco	secure_firewall_threat_defense	7.2.9	-	-
App	cisco	secure_firewall_threat_defense	7.3.0	-	-
App	cisco	secure_firewall_threat_defense	7.3.1	-	-
App	cisco	secure_firewall_threat_defense	7.3.1.1	-	-
App	cisco	secure_firewall_threat_defense	7.3.1.2	-	-
App	cisco	secure_firewall_threat_defense	7.4.0	-	-
App	cisco	secure_firewall_threat_defense	7.4.1	-	-
App	cisco	secure_firewall_threat_defense	7.4.1.1	-	-
App	cisco	secure_firewall_threat_defense	7.4.2	-	-
App	cisco	secure_firewall_threat_defense	7.4.2.1	-	-
App	cisco	secure_firewall_threat_defense	7.4.2.2	-	-
App	cisco	secure_firewall_threat_defense	7.4.2.3	-	-
App	cisco	secure_firewall_threat_defense	7.4.2.4	-	-
App	cisco	secure_firewall_threat_defense	7.4.3	-	-
App	cisco	secure_firewall_threat_defense	7.6.0	-	-
App	cisco	secure_firewall_threat_defense	7.6.1	-	-
App	cisco	secure_firewall_threat_defense	7.6.2	-	-
App	cisco	secure_firewall_threat_defense	7.6.2.1	-	-
App	cisco	secure_firewall_threat_defense	7.7.0	-	-
App	cisco	secure_firewall_threat_defense	7.7.10	-	-
App	cisco	secure_firewall_threat_defense	7.7.10.1	-	-

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