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Highest advisory severityHigh 1 vendor · 1 advisory

CVE-2026-20039

CVE-2026-20039: 1 tracked advisory record across Cisco. Compare vendor sources and published fix guidance.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

NVD detail CVE.org

Vendor advisory comparison

Cisco

1 advisory
  • Advisory severityHigh8.6

    High [CVE-2026-20039] Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software VPN Web Server Denial of Service Vulnerability

    cisco-sa-asaftd-vpn-dos-SpOFF2ReSource published Source updated

    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. Cisco has r…

    Related products — impact not confirmed
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.2
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.1.3
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2.4
    • Cisco Secure Firewall Adaptive Security Appliance (ASA) Software 9.12.2.5

    4 more entries in the full advisory.

    Source-reported affected versions
    • Scope: At the time of publication, this vulnerability affected Cisco products if they were running a vulnerable release of Cisco Secure Firewall ASA Software or Secure FTD Software with one or both of the following features configured:
    Source-reported fixed versions
    No fixed-version detail extracted. This does not mean no fix exists.
    Mitigation guidance
    No mitigation guidance extracted; consult the source.
    Workarounds
    • There are no workarounds that address this vulnerability.
    Full advisory and evidenceOpen source bulletin

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