CVE-2021-27561 KEV
9.8
CRITICAL · CVSS 3.1 · EPSS 82.9% (pctl 100)
Patch first
On CISA KEV — known exploited in the wild, due 2021-11-17.
Description
Yealink Device Management (DM) 3.6.0.20 allows command injection as root via the /sm/api/v1/firewall/zone/services URI, without authentication.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 82.87% — more likely to be exploited than 100% of all CVEs |
| Weakness | CWE-78 |
| On CISA KEV | yes — remediate by 2021-11-17 |
| Public exploit | none known |
| Published | 2021-10-15 |
| Last modified | 2026-06-17 |
CISA KEV
| Name | Yealink Device Management Server-Side Request Forgery (SSRF) Vulnerability |
|---|---|
| Added | 2021-11-03 |
| Due | 2021-11-17 |
| Vendor / product | Yealink / Device Management |
| Ransomware use | none reported |
Affected (1)
| Vendor | Product |
|---|---|
| yealink | device management |
References
→ the Explorer · watch your stack · NVD