CVE-2026-20101
A vulnerability in the SAML 2.0 single sign-on (SSO) feature of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an…
- 8.6HighCVSS base score
- 0.40%Exploitation in 30 daysEPSS · top 65% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
A vulnerability in the SAML 2.0 single sign-on (SSO) feature of Cisco Secure Firewall ASA Software and Secure FTD Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a DoS condition. This vulnerability is due to insufficient error checking when processing SAML messages. An attacker could exploit this vulnerability by sending crafted SAML messages to the SAML service. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.
Timeline
ID reserved
By cisco
- 5 months later
· 5 months later
Published
- 1 day later
· 1 day later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| ciscoCNA (assigner) | 3.1 | High8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
| NVDNVD · Analyzed | 3.1 | High8.6 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.40% · top 65% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.
Affected products
Cisco · Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
- affected 9.12.1
- affected 9.12.1.2
- affected 9.12.1.3
- affected 9.12.2
- affected 9.12.2.4
- affected 9.12.2.5
- affected 9.12.2.9
- affected 9.12.3
- affected 9.12.3.2
- affected 9.12.3.7
- affected 9.12.4
- affected 9.12.3.12
- affected 9.12.3.9
- affected 9.12.2.1
- affected 9.12.4.2
- affected 9.12.4.4
- affected 9.12.4.7
- affected 9.12.4.10
- affected 9.12.4.13
- affected 9.12.4.8
- affected 9.12.4.18
- affected 9.12.4.24
- affected 9.12.4.26
- affected 9.12.4.29
- affected 9.12.4.30
- affected 9.12.4.35
- affected 9.12.4.37
- affected 9.12.4.38
- affected 9.12.4.39
- affected 9.12.4.40
- affected 9.12.4.41
- affected 9.12.4.47
- affected 9.12.4.48
- affected 9.12.4.50
- affected 9.12.4.52
- affected 9.12.4.54
- affected 9.12.4.55
- affected 9.12.4.56
- affected 9.12.4.58
- affected 9.12.4.62
- and 107 more
Cisco · Cisco Secure Firewall Threat Defense (FTD) Software
- affected 6.4.0
- affected 6.4.0.1
- affected 6.4.0.3
- affected 6.4.0.2
- affected 6.4.0.4
- affected 6.4.0.5
- affected 6.4.0.6
- affected 6.4.0.7
- affected 6.4.0.8
- affected 6.4.0.9
- affected 6.4.0.10
- affected 6.4.0.11
- affected 6.4.0.12
- affected 6.4.0.13
- affected 6.4.0.14
- affected 6.4.0.15
- affected 6.4.0.16
- affected 6.4.0.17
- affected 6.4.0.18
- affected 7.0.0
- affected 7.0.0.1
- affected 7.0.1
- affected 7.0.1.1
- affected 7.0.2
- affected 7.0.2.1
- affected 7.0.3
- affected 7.0.4
- affected 7.0.5
- affected 7.0.6
- affected 7.0.6.1
- affected 7.0.6.2
- affected 7.0.6.3
- affected 7.0.7
- affected 7.0.8
- affected 7.0.8.1
- affected 7.1.0
- affected 7.1.0.1
- affected 7.1.0.2
- affected 7.1.0.3
- affected 7.2.0
- and 35 more
What to do
Exploitation: The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.
References
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-9440 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-20101)Record last updated .