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CVE-2026-20103 is a denial-of-service vulnerability in the Remote Access SSL VPN functionality of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software. The flaw is caused by trusting user-supplied input without proper validation, which allows crafted packets sent to the Remote Access SSL VPN server to trigger uncontrolled resource consumption. Specifically, exploitation can exhaust device memory, degrading the SSL VPN service and causing the device web interface to stop responding. The issue is remotely reachable and does not require authentication.
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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.
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 ASA and Cisco Secure Firewall Threat Defense (FTD) Remote Access SSL VPN, where crafted packets can exhaust device memory and make the web interface unresponsive, preventing new VPN connections.
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.