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CVE-2026-20022 is a denial-of-service vulnerability in the OSPF protocol implementation of Cisco Secure Firewall ASA Software and Cisco Secure FTD Software. The flaw is triggered when OSPF canonicalization debugging is enabled with the relevant debug command. The vulnerability is caused by insufficient input validation during processing of OSPF Link State Update (LSU) packets. A remote adjacent attacker can send crafted unauthenticated OSPF packets that cause an out-of-bounds memory write beyond the packet data buffer. Successful exploitation can force the affected device to reload unexpectedly, interrupting routing and firewall services.
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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.
6 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.