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High severity · published Dec 26, 2025
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…
8.8
CVSS
0.6%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 49% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SF
Sip-t21(p)e2 Firmware · Yealink
52.84.0.15 · source: NVD
Affected product
SF
Sip-t21(p)e2 Firmware
Yealink
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-66738
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-66738
Exploit
https://drive.google.com/file/d/13t5ywSPJMx4487njJcH3ZTNuc_k3h4ty/view?usp=sharing
More from Sip-t21(p)e2 Firmware
4.3
CVE-2025-66737
Yealink T21P_E2 Phone 52.84.0.15 is vulnerable to Directory Traversal