Quick answers
- Is CVE-2025-51085 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-51085 being exploited in the wild.
- How severe is CVE-2025-51085?
- Medium severity, with a CVSS score of 5.3, published 24 July 2025.
- Which products and versions are affected?
- Tenda AC8V4 V16.03.34.06.
- Is there a fix for CVE-2025-51085?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2025-51085 attacked?
- It is attacked over the network, in device firmware.
- Am I affected by CVE-2025-51085?
- Check whether you run Tenda Ac8, Tenda Ac8 Firmware or Tenda AC8V4 at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A stack-based buffer overflow (CWE-121) exists in the 'fromSetSysTime' function of the Tenda AC8V4 router firmware. When the 'timeType' parameter is set to 'sync', the application calls a sub-function (at address 004A75C0) that processes the 'timeZone' parameter. This parameter is retrieved from a POST request without length validation and is subsequently passed to a 'strcpy' call, leading to a stack overflow. A remote, unauthenticated attacker can exploit this by sending a long string in the 'timeZone' field to cause a denial-of-service (DoS) condition. Proof-of-concept code demonstrates the crash using a 2000-byte payload.
Affected products
- Tenda AC8V4 V16.03.34.06
Timeline
- 2025-07-24: disclosed: Initial vulnerability disclosure
- 2025-07-24: advisory: NVD publication date