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CVE-2024-20375

A vulnerability in the SIP call processing function of Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications…

High8.6EPSS 0.74%
Published
Updated
Reserved
Assigned by
cisco

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.

Timeline

  1. ID reserved

    By cisco

  2. · 10 months later

    Published

  3. · 2 days later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2024-20375, by who scored it
Scored byCVSSScoreVector
ciscoCNA (assigner)3.1High8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
NVDNVD · Analyzed3.1High7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.74% · top 45% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.6.

Weakness

Affected products

  • Cisco · Cisco Unified Communications Manager

    • affected 12.0(1)SU1
    • affected 12.0(1)SU2
    • affected 12.0(1)SU3
    • affected 12.0(1)SU4
    • affected 12.0(1)SU5
    • affected 12.5(1)
    • affected 12.5(1)SU1
    • affected 12.5(1)SU2
    • affected 12.5(1)SU3
    • affected 12.5(1)SU4
    • affected 12.5(1)SU5
    • affected 12.5(1)SU6
    • affected 12.5(1)SU7
    • affected 12.5(1)SU7a
    • affected 12.5(1)SU8
    • affected 12.5(1)SU8a
    • affected 14
    • affected 14SU1
    • affected 14SU2
    • affected 14SU3
    • affected 15

What to do

Exploitation: The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.

References (1)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .