Unauthenticated restricted URL access in Cisco Secure ASA/FTD VPN web server
CVE-2025-20362 is a vulnerability in the VPN web server component of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software. According to the provided Cisco advisory text, the flaw is caused by improper validation of user-supplied input in HTTP(S) requests and allows an unauthenticated remote attacker to access restricted remote-access VPN URL endpoints that should require authentication. An attacker can exploit the issue by sending crafted HTTP requests to the affected device’s web server. Cisco later reported a new attack variant against devices affected by CVE-2025-20362 and CVE-2025-20333 that can cause unpatched devices to unexpectedly reload, producing denial-of-service conditions.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
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.
Recent activity
280 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Cisco ASA/AnyConnect VPN vulnerability used for initial access into internal networks.
A Cisco firewall and VPN zero-day vulnerability mentioned in references as part of the broader trend of edge-device exploitation.
A Cisco firewall and VPN zero-day vulnerability referenced in related context about edge-device exploitation trends.
A privilege escalation vulnerability associated with attacks on Cisco infrastructure and linked to the ArcaneDoor campaign.
The version that knows your environment.
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.