Cisco Unified Communications Products Remote Code Execution Vulnerability

published 2021-04-08 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-6829

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 2.8%; EPSS 2.8% chance of exploitation in 30 days, percentile 86%
public exploits: 0; none known

A vulnerability in the SOAP API endpoint of Cisco Unified Communications Manager, Cisco Unified Communications Manager Session Management Edition, Cisco Unified Communications Manager IM & Presence Service, Cisco Unity Connection, and Cisco Prime License Manager could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper sanitization of user-supplied input. An attacker could exploit this vulnerability by sending a SOAP API request with crafted parameters to an affected device. A successful exploit could allow the attacker to execute arbitrary code with root privileges on the underlying Linux operating system of the affected device.

Patch / fix

fixed in 4

cisco prime_license_manager 11.5\(1\)su9
cisco unified_communications_manager 11.5\(1\)su9, 12.5\(1\)su4
cisco unified_communications_manager_im_&_presence_service 11.5\(1\)su9, 12.5\(1\)su4
cisco unity_connection 11.5\(1\)su9, 12.5\(1\)su4

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 2 y ago (2024-11-08)

Exploit prediction

2.81% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	9.0	AV:N/AC:L/Au:S/C:C/I:C/A:C

Affected products

Cisco Cisco Unity Connection

Classification

Weakness

CWE-94 Improper Control of Generation of Code

References

tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-cucm-rce-pqVYwyb
vendor-advisory

Sources

CVE List CVE-2021-1362
NVD CVE-2021-1362

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary