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CVE-2026-20023 Cisco Secure Firewall Threat Defense

Affected softwareCisco Secure Firewall Threat Defense
Severity6.5 Medium CVSS 3.1 2 scores
WeaknessOut-of-bounds write (CWE-787)
Published4 Mar 2026
Updated11 Aug 2026

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 unauthenticated, adjacent attacker to corrupt memory on an affected device, resulting in a denial of service (DoS) condition. This vulnerability is due to memory corruption when parsing OSPF protocol packets. An attacker could exploit this vulnerability by sending crafted OSPF packets to an affected device. A successful exploit could allow the attacker to cause memory corruption causing the affected device to reboot, resulting in a DoS condition.

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 0.17% 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.

CVSS

6.5 MEDIUM v3.1 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 6.5 MEDIUM CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD Primary published
CVSS 3.1 6.1 MEDIUM CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H psirt@cisco.com Secondary

Affected software and releases

Products and versions

2 products, 234 version entries
SourceVendorProductSchemeAffected versions
nvd cisco adaptive security appliance software generic 9.12.1 · 9.12.1.2 · 9.12.1.3 · 9.12.2 · 9.12.2.1 · 9.12.2.4 · 9.12.2.5 · 9.12.2.9 · 9.12.3 · 9.12.3.2 · 9.12.3.7 · 9.12.3.9 · 9.12.3.12 · 9.12.4 · 9.12.4.2 · 9.12.4.4 · 9.12.4.7 · 9.12.4.8 · 9.12.4.10 · 9.12.4.13 · 9.12.4.18 · 9.12.4.24 · 9.12.4.26 · 9.12.4.29 · 9.12.4.30 · 9.12.4.35 · 9.12.4.37 · 9.12.4.38 · 9.12.4.39 · 9.12.4.40 · 9.12.4.41 · 9.12.4.47 · 9.12.4.48 · 9.12.4.50 · 9.12.4.52 · 9.12.4.54 · 9.12.4.55 · 9.12.4.56 · 9.12.4.58 · 9.12.4.62 · 9.12.4.65 · 9.12.4.67 · 9.16.1 · 9.16.1.28 · 9.16.2 · 9.16.2.3 · 9.16.2.7 · 9.16.2.11 · 9.16.2.13 · 9.16.2.14 · 9.16.3 · 9.16.3.3 · 9.16.3.14 · 9.16.3.15 · 9.16.3.19 · 9.16.3.23 · 9.16.4 · 9.16.4.9 · 9.16.4.14 · 9.16.4.19 · 9.16.4.27 · 9.16.4.38 · 9.16.4.39 · 9.16.4.42 · 9.16.4.48 · 9.16.4.55 · 9.16.4.57 · 9.16.4.61 · 9.16.4.62 · 9.16.4.67 · 9.16.4.70 · 9.16.4.71 · 9.16.4.76 · 9.16.4.82 · 9.16.4.84 · 9.16.4.85 · 9.17.1 · 9.17.1.7 · 9.17.1.9 · 9.17.1.10 · 9.17.1.11 · 9.17.1.13 · 9.17.1.15 · 9.17.1.20 · 9.17.1.30 · 9.17.1.33 · 9.17.1.39 · 9.17.1.45 · 9.17.1.46 · 9.18.1 · 9.18.1.3 · 9.18.2 · 9.18.2.5 · 9.18.2.7 · 9.18.2.8 · 9.18.3 · 9.18.3.39 · 9.18.3.46 · 9.18.3.53 · 9.18.3.55 · 9.18.3.56 · 9.18.4 · 9.18.4.5 · 9.18.4.8 · 9.18.4.22 · 9.18.4.24 · 9.18.4.29 · 9.18.4.34 · 9.18.4.40 · 9.18.4.47 · 9.18.4.50 · 9.18.4.52 · 9.18.4.53 · 9.18.4.57 · 9.18.4.66 · 9.18.4.67 · 9.18.4.68 · 9.19.1 · 9.19.1.5 · 9.19.1.9 · 9.19.1.12 · 9.19.1.18 · 9.19.1.22 · 9.19.1.24 · 9.19.1.27 · 9.19.1.28 · 9.19.1.31 · 9.19.1.37 · 9.19.1.38 · 9.19.1.42 · 9.20.1 · 9.20.1.5 · 9.20.2 · 9.20.2.10 · 9.20.2.21 · 9.20.2.22 · 9.20.3 · 9.20.3.4 · 9.20.3.7 · 9.20.3.9 · 9.20.3.10 · 9.20.3.13 · 9.20.3.16 · 9.20.4 · 9.20.4.7 · 9.20.4.10 · 9.20.4.14 · 9.22.1.1 · 9.22.1.2 · 9.22.1.3 · 9.22.1.6 · 9.22.2.9 · 9.22.2.13 · 9.22.2.14 · 9.23.1 · 9.23.1.7 · 9.23.1.13 · 9.23.1.19 · 9.23.1.22
nvd cisco secure firewall threat defense generic 6.4.0 · 6.4.0.1 · 6.4.0.2 · 6.4.0.3 · 6.4.0.4 · 6.4.0.5 · 6.4.0.6 · 6.4.0.7 · 6.4.0.8 · 6.4.0.9 · 6.4.0.10 · 6.4.0.11 · 6.4.0.12 · 6.4.0.13 · 6.4.0.14 · 6.4.0.15 · 6.4.0.16 · 6.4.0.17 · 6.4.0.18 · 7.0.0 · 7.0.0.1 · 7.0.1 · 7.0.1.1 · 7.0.2 · 7.0.2.1 · 7.0.3 · 7.0.4 · 7.0.5 · 7.0.6 · 7.0.6.1 · 7.0.6.2 · 7.0.6.3 · 7.0.7 · 7.0.8 · 7.0.8.1 · 7.1.0 · 7.1.0.1 · 7.1.0.2 · 7.1.0.3 · 7.2.0 · 7.2.0.1 · 7.2.1 · 7.2.2 · 7.2.3 · 7.2.4 · 7.2.4.1 · 7.2.5 · 7.2.5.1 · 7.2.5.2 · 7.2.6 · 7.2.7 · 7.2.8 · 7.2.8.1 · 7.2.9 · 7.2.10 · 7.2.10.2 · 7.3.0 · 7.3.1 · 7.3.1.1 · 7.3.1.2 · 7.4.0 · 7.4.1 · 7.4.1.1 · 7.4.2 · 7.4.2.1 · 7.4.2.2 · 7.4.2.3 · 7.4.2.4 · 7.4.3 · 7.6.0 · 7.6.1 · 7.6.2 · 7.6.2.1 · 7.7.0 · 7.7.10.1

References

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

Timeline

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