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CVE-2025-20363 is a heap-based buffer overflow in the web services of Cisco Secure Firewall ASA, Secure Firewall FTD, IOS, IOS XE, and IOS XR software. Improper validation of user-supplied HTTP input permits crafted requests to cause memory corruption and potentially execute arbitrary code as root. Exploitation is unauthenticated on ASA and FTD, but requires low-privileged authenticated access on IOS, IOS XE, and IOS XR. Successful exploitation additionally requires obtaining target-specific system information, overcoming exploit mitigations, or both, and may result in complete device compromise.
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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.
72 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Allows an authenticated user to execute arbitrary code as root. The notice includes it among three vulnerabilities affecting Cisco ASA and Cisco Firepower, but does not specifically identify it as exploited in the ongoing campaign.
A high-severity Cisco Secure Firewall ASA and FTD HTTP request-based remote code execution vulnerability. An attacker must first obtain additional system information, bypass exploit mitigations, or both; successful exploitation grants root-level arbitrary code execution and can fully compromise the appliance.
A heap-based buffer overflow vulnerability in Cisco ASA/FTD, potentially allowing unauthenticated remote code execution as root. No evidence of exploitation in the wild as of reporting.
A remote code execution vulnerability in Cisco ASA/FTD (unauthenticated) and some Cisco IOS components (authenticated), allowing arbitrary code execution.
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.