DoS via OSPF LSU out-of-bounds write in Cisco Secure Firewall ASA/FTD (OSPF canonicalization debug)
A vulnerability in OSPF processing in Cisco Secure Firewall ASA Software and Cisco Secure FTD Software can be triggered when OSPF canonicalization debugging is enabled (via debug ip ospf canon). Due to insufficient input validation while processing OSPF Link State Update (LSU) packets, an unauthenticated adjacent attacker can send crafted OSPF packets that cause the device to write to memory outside the bounds of the packet data (out-of-bounds write), leading to an unexpected device reload and denial of service.
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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.
no debug ip ospf canon) unless actively required for troubleshooting, and restrict/segment OSPF adjacency to trusted L2/L3 neighbors to reduce exposure to crafted adjacent OSPF traffic. (No additional vendor-specific mitigations were provided in the content.)Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.