CVE-2025-66738
8.8 · HIGHOverview
CVE-2025-66738 is a high-severity vulnerability affecting yealink sip-t21\(p\)e2_firmware. It was published on December 26, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from yealink. Update sip-t21\(p\)e2_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
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Frequently Asked Questions
What is CVE-2025-66738?
CVE-2025-66738 is a high-severity vulnerability affecting yealink sip-t21\(p\)e2_firmware. It was published on December 26, 2025 and has a CVSS 3.1 base score of 8.8 (HIGH).
How severe is CVE-2025-66738?
This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.
How do I fix or remediate CVE-2025-66738?
Check the references section for vendor advisories and patches from yealink. Update sip-t21\(p\)e2_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2025-66738?
CyberStrike's AI-powered security agents can automatically detect CVE-2025-66738 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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