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CVE-2026-20349 is an improper clearing of heap memory before release vulnerability in HTTP request processing by the Remote Access SSL VPN service of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software. Insufficient error checking allows an unauthenticated remote attacker to submit a crafted HTTP request to an affected SSL listener, causing the appliance to reload unexpectedly. Cisco has confirmed active exploitation in August 2026. Cisco Secure Firewall Management Center Software 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.
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.
137 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability affecting Cisco Secure Firewall ASA and FTD Software that is mentioned as background context and noted as exploited in the wild.
A vulnerability identified as CVE-2026-20349 affecting Cisco Secure Firewall ASA and FTD.
A heap inspection vulnerability in Cisco Secure Firewall that could lead to denial-of-service conditions.
A heap inspection vulnerability affecting Cisco Secure Firewall ASA Software and Cisco Secure Firewall FTD Software.
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.