Vulnerability · CVE-2025-66738
An issue in Yealink T21P_E2 Phone 52.84.0.15 allows a remote normal privileged attacker to execute arbitrary code via a crafted request the ping function of the diagnostic componen
Published Dec 26, 2025 · catalog updated Jul 5, 2026 · An issue in Yealink
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-2025-66738. EPSS is 0.60%. Act only if a listed version of An issue in Yealink is installed.
Gaps on this record
- The stored product name is a package slug. The name on this page is taken from the title (An issue in Yealink).
- 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
- CVE-2026-78845 · Critical
- CVE-2026-107079 · Unknown
- CVE-2026-95168 · High
- CVE-2025-60475 · Medium
- CVE-2025-60494 · Unknown
- Severity
- High8.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.60%
- Remediation
- Vendor / distro source
- Affected products
- vendor n/a n/a n/a
An issue in Yealink T21P_E2 Phone 52.84.0.15 allows a remote normal privileged attacker to execute arbitrary code via a crafted request the ping 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-2025-66738
No stored fix
No vendor fix text is stored. Use the linked advisory before you change production.
Version check
No version range is stored, so an installed version cannot be checked on this page.
Advisory
Open the cve_org record and follow its fix.
Official advisories
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-2025-66738. EPSS is 0.60%. Act only if a listed version of An issue in Yealink 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 0.60%. 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.
Dec 26, 2025 · EUVD
Detected
An issue in Yealink T21P_E2 Phone 52.84.0.15 allows a remote normal privileged attacker to execute arbitrary code via a crafted request the ping function of the diagnostic component.
Jul 5, 2026 · EUVD
Updated
An issue in Yealink T21P_E2 Phone 52.84.0.15 allows a remote normal privileged attacker to execute arbitrary code via a crafted request the ping function of the diagnostic component.
Sources
- CVE.orgVulnerability recordCVE-2025-66738
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2025-66738
30-day exploitation probability 0.60%
first.org - EUVDVulnerability recordEUVD-2025-205450
An issue in Yealink T21P_E2 Phone 52.84.0.15 allows a remote normal privileged attacker to execute arbitrary code via a crafted request the ping 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