CVE-2021-1406

What it is

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.

At a glance

Exploitability

Can be exploited over the network with an admin-level account. High risk of data exposure.

Exploit odds

1.1% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2021-04-08 04:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 03:31 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 1.1% in the next 30 days (EPSS).
• Severity: 4.9 MEDIUM (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2021-04-08 04:15 UTC

Last modified

2026-06-17 03:31 UTC

Exploit probability

1.1% · EPSS, next 30 days

Weakness

CWE-538

Record status

Modified

Affected

• 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

Attack profile CVSS 3.1 · 4.9

Attack vector

Network

Complexity

Low

Privileges needed

High

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-1406.md and follow it. Check whether this project is affected by CVE-2021-1406. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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