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CVE-2026-20050 is a denial-of-service vulnerability in the Do Not Decrypt exclusion feature of the SSL decryption functionality in Cisco Secure Firewall Threat Defense (FTD) Software. The flaw is caused by improper memory management during inspection of TLS 1.2 encrypted traffic. An unauthenticated remote attacker can trigger the issue by sending crafted TLS 1.2 traffic through an affected device when the relevant SSL decryption policy path is exercised. Successful exploitation causes the affected device to reload, resulting in a service interruption. The issue is specific to TLS 1.2 traffic; other TLS versions are 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.
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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.
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.