CVE-2021-1406

Name: CVE-2021-1406
Creator: NVD / NIST
Published: 2021-04-08T04:15:12.593+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.9/10EPSS 1.08%

Last modified Jun 17, 2026

CVE-2021-1406 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an authenticated, remote attacker to access sensitive information on an affected device. The vulnerability is due to improper inclusion of sensitive information in downloadable files. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

Description

A vulnerability in Cisco Unified Communications Manager (Unified CM) and Cisco Unified Communications Manager Session Management Edition (Unified CM SME) could allow an authenticated, remote attacker to access sensitive information on an affected device. The vulnerability is due to improper inclusion of sensitive information in downloadable files. An attacker could exploit this vulnerability by authenticating to an affected device and issuing a specific set of commands. A successful exploit could allow the attacker to obtain hashed credentials of system users. To exploit this vulnerability an attacker would need to have valid user credentials with elevated privileges.

Metrics

CVSS 3.1

4.9/10

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

EPSS Probability

1.08%

60.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Unified Communications Manager	10.5\(2\)
Cisco	Unified Communications Manager	10.5\(2\)su1
Cisco	Unified Communications Manager	10.5\(2\)su2
Cisco	Unified Communications Manager	10.5\(2\)su2a
Cisco	Unified Communications Manager	10.5\(2\)su3
Cisco	Unified Communications Manager	10.5\(2\)su3a
Cisco	Unified Communications Manager	10.5\(2\)su4
Cisco	Unified Communications Manager	10.5\(2\)su4a
Cisco	Unified Communications Manager	10.5\(2\)su5
Cisco	Unified Communications Manager	10.5\(2\)su6
Cisco	Unified Communications Manager	10.5\(2\)su6a
Cisco	Unified Communications Manager	10.5\(2\)su7
Cisco	Unified Communications Manager	10.5\(2\)su8
Cisco	Unified Communications Manager	10.5\(2\)su9
Cisco	Unified Communications Manager	10.5\(2\)su10
Cisco	Unified Communications Manager	11.5\(1\)
Cisco	Unified Communications Manager	11.5\(1\)su1
Cisco	Unified Communications Manager	11.5\(1\)su2
Cisco	Unified Communications Manager	11.5\(1\)su3
Cisco	Unified Communications Manager	11.5\(1\)su4
Cisco	Unified Communications Manager	11.5\(1\)su5
Cisco	Unified Communications Manager	11.5\(1\)su7
Cisco	Unified Communications Manager	11.5\(1\)su8
Cisco	Unified Communications Manager	11.5\(1\)su9
Cisco	Unified Communications Manager	12.0\(1\)
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

References

Timeline

Published: Apr 8, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-1406?

How severe is CVE-2021-1406?

CVE-2021-1406 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.

How do I fix CVE-2021-1406?

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-2021-1406?

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

Scan your code now

Source: NVD / NIST