Loading vulnerability…
CVE-2025-20363 is a heap-based buffer overflow in the web services components of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Secure Firewall Threat Defense (FTD) Software, Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software. The flaw is caused by improper validation of user-supplied input in HTTP requests, which can result in insufficient heap allocation followed by an out-of-bounds write of attacker-controlled data. The resulting heap memory corruption can be leveraged to execute arbitrary code on the affected device. On Cisco ASA and FTD, exploitation is possible by an unauthenticated remote attacker through the exposed vulnerable web service. On Cisco IOS, IOS XE, and IOS XR, exploitation requires authenticated remote access with low user privileges. Successful exploitation can result in arbitrary code execution as root and may lead to complete compromise of the device. Available reporting also indicates exploitation may require target-specific information disclosure, mitigation bypass, or both.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
67 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.
A vulnerability affecting Cisco ASA, FTD, IOS, IOS XE, and IOS XR with Remote Access VPN enabled, allowing arbitrary code execution (unauthenticated on ASA/FTD, authenticated on other platforms).
A Cisco vulnerability listed as trending and critical, but no specific details provided in the content.
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.