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CVE-2024-20375 Cisco Unified Communications Manager

Affected softwareCisco Unified Communications Manager
Severity8.6 High CVSS 3.1 2 scores
WeaknessOut-of-bounds write (CWE-787)
Published21 Aug 2024
Updated17 Jun 2026

Description

A vulnerability in the SIP call processing function of Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper parsing of SIP messages. An attacker could exploit this vulnerability by sending a crafted SIP message to an affected Cisco Unified CM or Cisco Unified CM SME device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition that interrupts the communications of reliant voice and video devices.

Exploitation status

No public exploit

No exploit has been reported in the sources we check. Published 2 years ago.

  • CISA KEV not listed
  • VulnCheck KEV not listed
  • CISA Vulnrichment exploitation: none
  • Indexed PoC none indexed
  • EPSS 0.74% chance in 30 days

Waratek protection

Outside Waratek scope

A Java vulnerability, but not one Waratek protects. It affects only Java on a user's desktop (applets, Web Start, JavaFX, the installer), sits in a product the Waratek agent can't be installed into, or is in a package we don't expect in business applications. The decision below says which.

  • Protection none
  • Action not pursued none
  • Review automated Upstream data
  • Record active
Decided by The only affected product being a sealed appliance image, where Java runs but no -javaagent can be attached
Finding This CVE names only products the Waratek agent cannot be installed into (cisco/unified_communications_manager). They ship as sealed appliance images or as native code with no application JVM, so there is no start-up line to add -javaagent to. The vulnerability may well be a Java one; it is permanently out of ARMR's reach rather than outside its subject.

CVSS

8.6 HIGH v3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H 2 metrics

We show the highest score from the newest CVSS version. Scores from different versions can't be compared, and the first score listed is sometimes a 0.0 placeholder.

VersionScoreBandVectorAssignerType
CVSS 3.1 8.6 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H psirt@cisco.com Secondary published
CVSS 3.1 7.5 HIGH CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H NVD Primary

Affected software and releases

Products and versions

1 product, 16 version entries
SourceVendorProductSchemeAffected versions
nvd cisco unified communications manager generic 12.0\(1\)su1 · 12.0\(1\)su2 · 12.0\(1\)su3 · 12.0\(1\)su4 · 12.0\(1\)su5 · 12.5\(1\) · 12.5\(1\)su1 · 12.5\(1\)su2 · 12.5\(1\)su3 · 12.5\(1\)su4 · 12.5\(1\)su5 · 12.5\(1\)su6 · 12.5\(1\)su7 · 12.5\(1\)su7a · 12.5\(1\)su8 · 12.5\(1\)su8a

References

URLTags
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-dos-kkHq43We Vendor Advisory

Timeline

Published2024-08-21By the CVE Program.
NVD record modified2026-06-17NVD's own last-modified date for this record.