What’s Vulnerable › Vulnerabilities

CVE-2026-7208: Yealink SIP-T33G < 124.87.0.0 Race Condition via Diagnostic File Deletion

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-24
• Weakness: CWE-362

Description

Yealink SIP-T33G firmware versions 124.86.x.x prior to 124.87.0.0 contain a race condition vulnerability that allows authenticated attackers to interrupt active diagnostic processes by concurrently deleting output files written to predictable paths under the diagnostic directory. Attackers can trigger a diagnostic operation such as traceroute or ping and simultaneously invoke the file deletion endpoint to terminate the running process, leaving the system in an inconsistent state.

Affected products

• Yealink SIP-T33G: from 124.86.0.0 before 124.87.0.0 — fixed in 124.87.0.0

How to fix

Upgrade to a fixed version: Yealink SIP-T33G 124.87.0.0. Check the vendor advisory for mitigations.

References

• https://www.vulncheck.com/advisories/yealink-sip-t33g-race-condition-via-diagnostic-file-deletion
• https://www.yealink.com/en/product-detail/ip-phone-t33g
• https://www.yealink.com/en/trust-center/security-bulletins/race-condition-on-runtime-diagnostic-files-in-yealink-sipt33g

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