Signal is active with 1 mentions in latest observed window
Recommended action window: Monitor and triage in normal cycle
NVD description
A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Priority
LOW
Exploitation
NONE
PoC
NONE
Patch
AVAILABLE
Momentum
STABLE
If you run products in this scope, you should treat this CVE as relevant to your environment.
| Date | Total | Labels |
|---|
| 2026-03-04 | 3 | Disclosure2Patch1 |
| 2026-03-07 | 2 | Disclosure2 |
| 2026-03-09 | 1 | Patch1 |
CVE-2026-20039 — Unauthenticated DoS in Cisco ASA/FTD VPN Web Server ⏬ Thread ⏬ #SecurityAlert https://t.co/hzzrDWSFW6
Post summary
The tweet announces CVE-2026-20039, describing an unauthenticated DoS vulnerability in Cisco ASA/FTD VPN Web Server, but does not provide additional exploitation or mitigation details.
1️⃣ Your Cisco ASA is rebooting under HTTP flood and you don't even need creds to trigger it. CVE-2026-20039, CVSS 8.6. Heap memory never cleared before release. Full DoS, no workaround. #infosec https://t.co/he93CMObRQ
Post summary
The post announces a DoS vulnerability (CVE‑2026‑20039) affecting Cisco ASA devices that can be triggered via HTTP flood without credentials, provides basic technical details such as CVSS score and heap memory issue, and notes there is no workaround or patch available.
CVE-2026-20039 Your Cisco ASA is rebooting under HTTP flood ⏬FIX⏬ https://www.linkedin.com/pulse/cve-2026-20039-your-cisco-asa-rebooting-under-http-flood-elomary-cpx7f https://t.co/0RLpsNT7G7
Post summary
The tweet announces CVE-2026-20039, a vulnerability that causes Cisco ASA devices to reboot under HTTP flood, and references a fix available via the linked article.
CVE-2026-20039 A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software coul… https://www.cve.org/CVERecord?id=CVE-2026-20039
Post summary
The excerpt merely cites CVE‑2026‑20039 and links to its CVE record, providing no exploit details, patch information, or evidence of active exploitation.
🟠 CVE-2026-20039 - High A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticate... https://www.thehackerwire.com/vulnerability/CVE-2026-20039/ https://t.co/CmaFwlvqLy
Post summary
The tweet announces CVE-2026-20039, a high‑severity vulnerability in Cisco Secure Firewall’s VPN web server that could allow unauthenticated access, with a link to an external article for more details.
[CVE-2026-20039: HIGH] Critical vulnerability in Cisco Secure Firewall ASA and FTD Software could lead to DoS attacks. Ensure timely patching to prevent exploitation by remote attackers.#cve,CVE-2026-20039,#cybersecurity https://cvefind.com/CVE-2026-20039
Post summary
The post announces the high‑severity CVE‑2026‑20039, a DoS vulnerability in Cisco Secure Firewall ASA and FTD Software, and urges users to apply patches to mitigate remote exploitation.
2 of 2 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| OS | cisco | adaptive_security_appliance_software | - | - | - |
| App | cisco | secure_firewall_threat_defense | - | - | - |