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CVE record · CVE-2026-20281

Cisco Desk Phone 9800 Series, IP Phone 7800 and 8800 Series, and Video Phone 8875 with SIP Software Denial of Service Vulnerability

CVSS 7.5 HighEPSS 0.0057 · 47th percentile

Published by the CVE Program (CNA: cisco) at 2 Sept 2026, 16:14 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Cisco Cisco Session Initiation Protocol (SIP) Software
  • affected 12.1(1)SR1
  • affected 11.5(1)
  • affected 10.3(2)
  • affected 10.2(2)
  • affected 10.3(1)
  • affected 10.3(1)SR4
  • affected 11.0(1)
  • affected 10.4(1)SR2 3rd Party
  • affected 11.7(1)
  • affected 12.1(1)
  • affected 11.0(0.7) MPP
  • affected 9.3(4) 3rd Party
  • and 98 more
Other versions: unknown
Identifiers
CVE-2026-20281
CNA
cisco
Weakness (CWE)
CWE-401
Tags
Published
2 Sept 2026
Updated
2 Sept 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CNA (cisco)
  • CISA KEV Not listed.
  • EPSS 0.0057, the 47th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 2 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.