CVE-2021-27561 is a critical unauthenticated command injection vulnerability in Yealink Device Management (DM) version 3.6.0.20, specifically affecting the /sm/api/v1/firewall/zone/services URI. With a CVSS score of 9.8, this flaw allows remote attackers to execute arbitrary commands as root with no user interaction required, leading to complete compromise of confidentiality, integrity, and availability. This vulnerability is actively exploited in the wild, as evidenced by its inclusion in CISA's KEV catalog and mentions in media coverage regarding botnet activity. While no Metasploit or ExploitDB modules exist, Nuclei templates are available, and there is significant community discussion surrounding this CVE.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
<= 3.6.0.20CPE matchmatch criteria | cpe:2.3:a:yealink:device_management:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.