Yealink T21P_E2 Phone 52.84.0.15 is vulnerable to Directory Traversal.
Priority MEDIUM 53CWE-23Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-23 and the CVSS impact.
Summary
Yealink T21P_E2 Phone 52.84.0.15 is vulnerable to Directory Traversal. A remote normal privileged attacker can read arbitrary files via a crafted request result read function of the diagnostic component.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00661 51st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2025-66737
- 2026-10-03 Alias added: GHSA-8cpr-48rw-5rrc
- 2026-10-07 EPSS moved to the 50th–90th percentile
References
More Yealink Sip-t21(p)e2 Firmware vulnerabilities
- TI-2025-41051 An issue in Yealink T21P_E2 Phone 52.84.0.15 allows a remote normal privileged attacker… CVSS 3.1HIGH 8.8
Sources
- CVE-2025-66737 · CVE Program
- CVE-2025-66737 · NVD
- FIRST EPSS
- GHSA-8cpr-48rw-5rrc · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences