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CVE-2026-20052 is a denial-of-service vulnerability in the Snort 3 Detection Engine of Cisco Secure Firewall Threat Defense (FTD) Software. The flaw is caused by a logic error in memory management during Snort 3 SSL packet inspection. When the device is performing Snort 3 SSL inspection, crafted SSL packets sent over an established connection can trigger the faulty memory-handling path in the detection engine. Successful exploitation causes the Snort 3 Detection Engine to restart unexpectedly, interrupting inspection and security processing.
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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.