Microsoft Communicator, and Communicator in Microsoft Office 2010 beta, allows remote attackers to cause a denial of service (memory consumption) via a large number of SIP INVITE requests, which trigger the creation of many sessions.
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Score 5.3 from GitHub Security Advisory published 2022-05-17. NVD baseline CVSS 5.3; sources differ by 0.0.
Microsoft Communicator, and Communicator in Microsoft Office 2010 beta, allows remote attackers to cause a denial of service (memory consumption) via a large number of SIP INVITE requests, which trigger the creation of many sessions.
November 20, 2008
April 23, 2026
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.
Working exploit code is in the public domain (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
Microsoft Office 2010 Beta - Communicator SIP Denial of Service
Open source ↗Microsoft Office - Communicator 'SIP' Remote Denial of Service
Open source ↗See which npm, PyPI, Go, and Maven packages are affected by CVE-2008-5180
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