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CVE-2026-20025 is a denial-of-service vulnerability in the OSPF protocol implementation of Cisco Secure Firewall ASA Software and Cisco Secure Firewall FTD Software. The flaw is caused by insufficient input validation while processing OSPF link-state update (LSU) packets. An authenticated adjacent attacker who possesses the OSPF secret key can send crafted LSU packets to a vulnerable device, triggering heap corruption during packet handling. Successful exploitation can cause the affected device to reload unexpectedly.
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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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.