Quick answers
- Is CVE-2026-5548 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-5548 being exploited in the wild.
- How severe is CVE-2026-5548?
- High severity, with a CVSS score of 8.8, published 5 April 2026.
- Which products and versions are affected?
- Tenda AC10 16.03.10.10_multi_TDE01.
- Is there a fix for CVE-2026-5548?
- 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-2026-5548 attacked?
- It is attacked over the network, in device firmware.
- Am I affected by CVE-2026-5548?
- Check whether you run Tenda AC10 or Tenda AC10 firmware 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 vulnerability exists in the 'fromSysToolChangePwd' function within the '/bin/httpd' binary of Tenda AC10 firmware version 16.03.10.10_multi_TDE01. The root cause is an unbounded copy operation where the 'GetValue' function retrieves the 'sys.userpass' argument into a fixed-size 36-byte stack buffer without length validation. A remote attacker with the ability to manipulate this NVRAM value (potentially through chained exploitation of other vulnerabilities) can overflow the buffer to overwrite the saved return address ($ra). This can lead to arbitrary code execution or a denial-of-service condition.
Affected products
- Tenda AC10 16.03.10.10_multi_TDE01
Timeline
- 2026-04-05: disclosed: Initial disclosure via VulDB and NVD
- 2026-04-05: advisory