Quick answers
- Is CVE-2025-51087 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2025-51087 being exploited in the wild.
- How severe is CVE-2025-51087?
- High severity, with a CVSS score of 8.6, published 24 July 2025.
- Which products and versions are affected?
- Tenda AC8V4 V16.03.34.06.
- Is there a fix for CVE-2025-51087?
- 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-2025-51087 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2025-51087?
- 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 Tenda AC8V4 router firmware version V16.03.34.06. The vulnerability is located within the 'compare_parentcontrol_time' function, which processes requests sent to the '/goform/saveParentControlInfo' endpoint. The root cause is the use of the 'sscanf' function to copy the user-supplied 'time' POST parameter into a fixed-size stack buffer without adequate length validation. A remote, unauthenticated attacker can exploit this by sending a long string in the 'time' argument, leading to memory corruption. This can result in a denial-of-service (DoS) condition or potentially arbitrary code execution.
Affected products
- Tenda AC8V4 V16.03.34.06
Timeline
- 2025-07-24: disclosed
- 2025-07-24: advisory