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CRITICAL SEVERITY
CVE-2021-27561 Yealink · Device Management

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

Technical Severity

CVSS v3.1 Metrics

CRITICAL
9.8 / 10
Minimal Risk Critical
Vector Specification
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Exploitation Likelihood

EPSS Prediction

94.11 %
Predictive Probability
Percentile Rank
99.9 th

Documented as more likely to be exploited than 99.9% of known CVEs.

Detection Date

Nov 03, 2021

Remediation Due

Nov 17, 2021

CISA Catalog Active

Threat Analysis

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

Remediation Directive

Apply updates per vendor instructions.

External Intelligence

NVD

National Vulnerability Database

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