SB2026090285 - Denial of service in Cisco SIP IP Phone software for Desk phones

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Main Vulnerability Database SB2026090285

SB2026090285 - Denial of service in Cisco SIP IP Phone software for Desk phones

Published: September 2, 2026

Security Bulletin ID SB2026090285
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Memory leak (CVE-ID: CVE-2026-20281)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper memory management in web access handling when processing HTTP packets. A remote attacker can send a continuous stream of crafted HTTP packets to cause a denial of service.

The device must be registered to Cisco Unified Communications Manager and have Web Access enabled. A manual reboot is required to recover from the condition.


Remediation

Install update from vendor's website.

References