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CVE-2026-20006 is a denial-of-service vulnerability in the TLS cryptography functionality of the Snort 3 Detection Engine used by Cisco Secure Firewall Threat Defense (FTD) Software. The flaw is caused by an improper implementation of the TLS protocol in Snort 3 processing. A remote, unauthenticated attacker can trigger the issue by sending a crafted TLS packet to an affected device. Successful exploitation causes the Snort 3 Detection Engine to unexpectedly restart, interrupting inspection and resulting in dropped network traffic. TLS 1.3 is not affected.
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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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.