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CVE-2026-20101 is a denial-of-service vulnerability in the SAML 2.0 single sign-on feature of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software. The flaw is caused by insufficient error checking during processing of SAML messages. A remote, unauthenticated attacker can send crafted SAML messages to the affected SAML service and trigger an unexpected device reload. The issue affects authentication-related functionality exposed through the Remote Access SSL VPN environment and results in service interruption rather than confidentiality or integrity compromise.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
16 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Unauthenticated remote denial-of-service vulnerability in Cisco Secure Firewall ASA and Secure FTD SAML 2.0 SSO processing, where crafted SAML messages can trigger an unexpected reload.
Denial of service vulnerability affecting Cisco ASA and Cisco Secure Firewall Threat Defense (FTD) Remote Access SSL VPN.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.