CVE-2024-20375

Name: CVE-2024-20375
Creator: NVD / NIST
Published: 2024-08-21T17:15:07.303+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 0.74%

Last modified Jun 17, 2026

CVE-2024-20375 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.74% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

0.74%

50.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Cisco	Unified Communications Manager	12.0\(1\)su1
Cisco	Unified Communications Manager	12.0\(1\)su2
Cisco	Unified Communications Manager	12.0\(1\)su3
Cisco	Unified Communications Manager	12.0\(1\)su4
Cisco	Unified Communications Manager	12.0\(1\)su5
Cisco	Unified Communications Manager	12.5\(1\)
Cisco	Unified Communications Manager	12.5\(1\)su1
Cisco	Unified Communications Manager	12.5\(1\)su2
Cisco	Unified Communications Manager	12.5\(1\)su3
Cisco	Unified Communications Manager	12.5\(1\)su4
Cisco	Unified Communications Manager	12.5\(1\)su5
Cisco	Unified Communications Manager	12.5\(1\)su6
Cisco	Unified Communications Manager	12.5\(1\)su7
Cisco	Unified Communications Manager	12.5\(1\)su7a
Cisco	Unified Communications Manager	12.5\(1\)su8
Cisco	Unified Communications Manager	12.5\(1\)su8a

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-dos-kkHq43WeVendor Advisory

Timeline

Published: Aug 21, 2024
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2024-20375?

How severe is CVE-2024-20375?

CVE-2024-20375 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.74% probability of exploitation in the next 30 days.

How do I fix CVE-2024-20375?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2024-20375?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST