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major vulnerability· requires attention

Affects widely deployed Cisco Secure Firewall ASA/FTD; high-severity DoS via unauthenticated SAML, could disrupt networks.

Infrastructure

CVE-2026-20101

8.6
High
EPSS 0.35%Patch availableMar 5, 2026

Unauthenticated SAML SSO DoS on Cisco ASA/FTD; device reloads.

common questions

Is CVE-2026-20101 being exploited?

Not confirmed. CVE-2026-20101 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.35% probability of exploitation in the next 30 days.

How severe is CVE-2026-20101?

CVE-2026-20101 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2026-20101?

Yes. A fix has been recorded for CVE-2026-20101. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2026-20101 affect?

CVE-2026-20101 affects Cisco Secure Firewall ASA Software, Cisco Secure Firewall FTD Software. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

What should I do about CVE-2026-20101?

Patch when available; monitor SAML traffic and apply mitigations.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
Cisco Secure Firewall ASA SoftwareCisco Secure Firewall FTD Software
impact

Unauthenticated attacker can trigger reload of Cisco ASA/FTD by sending crafted SAML messages, causing DoS and potential network disruption.

action required

Immediate action required

affected versions
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software
  • affected9.12.1
  • affected9.12.1.2
  • affected9.12.1.3
  • affected9.12.2
  • affected9.12.2.4
  • affected9.12.2.5
  • affected9.12.2.9
  • affected9.12.3
  • affected9.12.3.2
  • affected9.12.3.7
  • affected9.12.4
  • affected9.12.3.12
  • affected9.12.3.9
  • affected9.12.2.1
  • affected9.12.4.2
  • affected9.12.4.4
  • affected9.12.4.7
  • affected9.12.4.10
  • affected9.12.4.13
  • affected9.12.4.8
  • affected9.12.4.18
  • affected9.12.4.24
  • affected9.12.4.26
  • affected9.12.4.29
  • affected9.12.4.30
  • affected9.12.4.35
  • affected9.12.4.37
  • affected9.12.4.38
  • affected9.12.4.39
  • affected9.12.4.40
  • affected9.12.4.41
  • affected9.12.4.47
  • affected9.12.4.48
  • affected9.12.4.50
  • affected9.12.4.52
  • affected9.12.4.54
  • affected9.12.4.55
  • affected9.12.4.56
  • affected9.12.4.58
  • affected9.12.4.62
  • affected9.12.4.65
  • affected9.12.4.67
  • affected9.16.1
  • affected9.16.1.28
  • affected9.16.2
  • affected9.16.2.3
  • affected9.16.2.7
  • affected9.16.2.11
  • affected9.16.2.13
  • affected9.16.2.14
  • affected9.16.3
  • affected9.16.3.3
  • affected9.16.3.14
  • affected9.16.3.15
  • affected9.16.3.19
  • affected9.16.3.23
  • affected9.16.4
  • affected9.16.4.9
  • affected9.16.4.14
  • affected9.16.4.19
  • affected9.16.4.27
  • affected9.16.4.38
  • affected9.16.4.39
  • affected9.16.4.42
  • affected9.16.4.48
  • affected9.16.4.55
  • affected9.16.4.57
  • affected9.16.4.61
  • affected9.16.4.62
  • affected9.16.4.67
  • affected9.16.4.70
  • affected9.16.4.71
  • affected9.16.4.76
  • affected9.16.4.82
  • affected9.16.4.84
  • affected9.17.1
  • affected9.17.1.7
  • affected9.17.1.9
  • affected9.17.1.10
  • affected9.17.1.11
  • affected9.17.1.13
  • affected9.17.1.15
  • affected9.17.1.20
  • affected9.17.1.30
  • affected9.17.1.33
  • affected9.17.1.39
  • affected9.17.1.45
  • affected9.17.1.46
  • affected9.18.1
  • affected9.18.1.3
  • affected9.18.2
  • affected9.18.2.5
  • affected9.18.2.7
  • affected9.18.2.8
  • affected9.18.3
  • affected9.18.3.39
  • affected9.18.3.46
  • affected9.18.3.53
  • affected9.18.3.55
  • affected9.18.3.56
  • affected9.18.4
  • affected9.18.4.5
  • affected9.18.4.8
  • affected9.18.4.22
  • affected9.18.4.24
  • affected9.18.4.29
  • affected9.18.4.34
  • affected9.18.4.40
  • affected9.18.4.47
  • affected9.18.4.50
  • affected9.18.4.52
  • affected9.18.4.53
  • affected9.18.4.57
  • affected9.19.1
  • affected9.19.1.5
  • affected9.19.1.9
  • affected9.19.1.12
  • affected9.19.1.18
  • affected9.19.1.22
  • affected9.19.1.24
  • affected9.19.1.27
  • affected9.19.1.28
  • affected9.19.1.31
  • affected9.19.1.37
  • affected9.19.1.38
  • affected9.19.1.42
  • affected9.20.1
  • affected9.20.1.5
  • affected9.20.2
  • affected9.20.2.10
  • affected9.20.2.21
  • affected9.20.2.22
  • affected9.20.3
  • affected9.20.3.4
  • affected9.20.3.7
  • affected9.20.3.9
  • affected9.20.3.10
  • affected9.20.3.13
  • affected9.20.3.16
  • affected9.20.3.20
  • affected9.22.1.1
  • affected9.22.1.3
  • affected9.22.1.2
  • affected9.22.1.6
  • affected9.22.2
  • affected9.23.1
  • affected9.23.1.3
Cisco Cisco Secure Firewall Threat Defense (FTD) Software
  • affected6.4.0
  • affected6.4.0.1
  • affected6.4.0.3
  • affected6.4.0.2
  • affected6.4.0.4
  • affected6.4.0.5
  • affected6.4.0.6
  • affected6.4.0.7
  • affected6.4.0.8
  • affected6.4.0.9
  • affected6.4.0.10
  • affected6.4.0.11
  • affected6.4.0.12
  • affected6.4.0.13
  • affected6.4.0.14
  • affected6.4.0.15
  • affected6.4.0.16
  • affected6.4.0.17
  • affected6.4.0.18
  • affected7.0.0
  • affected7.0.0.1
  • affected7.0.1
  • affected7.0.1.1
  • affected7.0.2
  • affected7.0.2.1
  • affected7.0.3
  • affected7.0.4
  • affected7.0.5
  • affected7.0.6
  • affected7.0.6.1
  • affected7.0.6.2
  • affected7.0.6.3
  • affected7.0.7
  • affected7.0.8
  • affected7.0.8.1
  • affected7.1.0
  • affected7.1.0.1
  • affected7.1.0.2
  • affected7.1.0.3
  • affected7.2.0
  • affected7.2.0.1
  • affected7.2.1
  • affected7.2.2
  • affected7.2.3
  • affected7.2.4
  • affected7.2.4.1
  • affected7.2.5
  • affected7.2.5.1
  • affected7.2.6
  • affected7.2.7
  • affected7.2.5.2
  • affected7.2.8
  • affected7.2.8.1
  • affected7.2.9
  • affected7.2.10
  • affected7.2.10.2
  • affected7.3.0
  • affected7.3.1
  • affected7.3.1.1
  • affected7.3.1.2
  • affected7.4.0
  • affected7.4.1
  • affected7.4.1.1
  • affected7.4.2
  • affected7.4.2.1
  • affected7.4.2.2
  • affected7.4.2.3
  • affected7.4.2.4
  • affected7.6.0
  • affected7.6.1
  • affected7.6.2
  • affected7.6.2.1
  • affected7.7.0
  • affected7.7.10
  • affected7.7.10.1

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
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