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CVE-2026-20049 Cisco Secure Firewall Threat Defense

Affected softwareCisco Secure Firewall Threat Defense
Severity7.7 High CVSS 3.1
WeaknessCWE-131
Published4 Mar 2026
Updated11 Aug 2026

Description

A vulnerability in the processing of Galois/Counter Mode (GCM)-encrypted Internet Key Exchange version 2 (IKEv2) IPsec traffic of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to the allocation of an insufficiently sized block of memory. An attacker could exploit this vulnerability by sending crafted GCM-encrypted IPsec traffic to an affected device. A successful exploit could allow the attacker to cause an unexpected reload of the device, resulting in a DoS condition. To exploit this vulnerability, the attacker must have valid credentials to establish a VPN connection with the affected device.

Exploitation status

No public exploit

No exploit has been reported in the sources we check.
  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.34% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review automated Upstream data
  • Record active
Decided by The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached
Finding This CVE names only products the Waratek agent cannot be installed into (cisco/secure_firewall_threat_defense). They ship as sealed appliance images or as native code with no application JVM, so there is no start-up line to add -javaagent to. The vulnerability may well be a Java one; it is permanently out of ARMR's reach rather than outside its subject.

Affected software and releases

Products and versions

2 products, 8 version entries
SourceVendorProductSchemeAffected versions
nvd cisco adaptive security appliance software generic ≥ 9.18.1 and ＜ 9.18.4.66 · ≥ 9.19.1 and ＜ 9.20.3.20 · ≥ 9.22.1.1 and ＜ 9.22.2.4 · ≥ 9.23.1 and ＜ 9.23.1.3
nvd cisco secure firewall threat defense generic ≥ 7.2.0 and ＜ 7.2.11 · ≥ 7.3.0 and ＜ 7.4.3 · ≥ 7.6.0 and ＜ 7.6.4 · ≥ 7.7.0 and ＜ 7.7.10

References

URLTags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-esp-dos-uv7yD8P5 Vendor Advisory

Timeline
Published2026-03-04By the CVE Program.
NVD record modified2026-08-11NVD's own last-modified date for this record.