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CVE-2026-20281 is an unauthenticated remote denial-of-service vulnerability in Cisco Session Initiation Protocol (SIP) Software affecting Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 devices. Improper memory management during HTTP packet processing permits a continuous stream of crafted HTTP packets to cause sustained memory consumption. The affected device eventually enters a denial-of-service state and requires a manual reboot for recovery.
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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.
A high-severity Cisco SIP phone vulnerability that enables unauthenticated remote denial of service through continuous streams of crafted HTTP packets.
An unauthenticated remote denial-of-service vulnerability caused by improper memory management while processing HTTP packets in affected Cisco SIP desk and video phones. Exploitation requires registration to Cisco Unified Communications Manager and enabled Web Access.
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.