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Vulnerabilities

Vulnerability · CVE-2025-66737

Yealink T21P_E2 Phone 52.84.0.15 is vulnerable to Directory Traversal.

Published Dec 26, 2025 · catalog updated Jul 5, 2026 · Yealink T21P_E2 Phone 52.84.0.15

Last checked Nov 1, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-66737. EPSS is 0.66%. Act only if a listed version of Yealink T21P_E2 Phone 52.84.0.15 is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (Yealink T21P_E2 Phone 52.84.0.15).
  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
Medium4.3
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.66%
Remediation
Vendor / distro source
Affected products
vendor n/a n/a n/a

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor n/a n/a n/an/a

How to fix CVE-2025-66737

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-66737. EPSS is 0.66%. Act only if a listed version of Yealink T21P_E2 Phone 52.84.0.15 is installed.

Which versions are affected?

Compare what you have installed with n/a n/a n/a n/a. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.66%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Dec 26, 2025 · EUVD

    Detected

    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.

  2. Jul 5, 2026 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-66737

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-66737

    30-day exploitation probability 0.66%

    first.org
  • EUVDVulnerability recordEUVD-2025-205448

    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.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSNov 1, 2026
  • CVE.orgOct 29, 2026
  • EUVDOct 29, 2026