CVE-2021-27561 : Yealink Device Management (DM) 3.6.0.20 allows command injection as root via the

Yealink Device Management (DM) 3.6.0.20 allows command injection as root via the /sm/api/v1/firewall/zone/services URI, without authentication.

Published 2021-10-15 18:15:07

Updated 2025-02-04 20:15:42

Source MITRE

View at NVD, CVE.org

Products affected by CVE-2021-27561

Yealink » Device Management
Versions up to, including, (<=) 3.6.0.20
cpe:2.3:a:yealink:device_management:*:*:*:*:*:*:*:*
Matching versions

CISA vulnerability name:

Yealink Device Management Server-Side Request Forgery (SSRF) Vulnerability

CISA required action:

Apply updates per vendor instructions.

CISA description:

Yealink Device Management contains a server-side request forgery (SSRF) vulnerability that allows for unauthenticated remote code execution.

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2021-27561

Added on 2021-11-03 Action due date 2021-11-17

EPSS FAQ

94.18%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 100 %

Percentile, the proportion of vulnerabilities that are scored at or less

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source	First Seen
10.0	HIGH	AV:N/AC:L/Au:N/C:C/I:C/A:C	10.0	10.0	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: Complete Integrity Impact: Complete Availability Impact: Complete
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	134c704f-9b21-4f2e-91b3-4a467353bcc0	2025-02-04
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High
9.8	CRITICAL	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	3.9	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.
Assigned by:
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
- nvd@nist.gov (Primary)
CWE-918 Server-Side Request Forgery (SSRF)

The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

Assigned by: nvd@nist.gov (Primary)

https://ssd-disclosure.com/?p=4688

SSD Advisory – Yealink DM Pre Auth 'root' level RCE - SSD Secure Disclosure
Third Party Advisory

Jump to