Quick answers
- Is CVE-2026-36789 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-36789 being exploited in the wild.
- How severe is CVE-2026-36789?
- Informational severity, with a CVSS score of 7.5, published 8 June 2026.
- Which products and versions are affected?
- Tenda AC1206 v15.03.06.23.
- Is there a fix for CVE-2026-36789?
- 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-2026-36789 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-36789?
- Check whether you run Tenda AC1206 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 exists in the 'fromGstDhcpSetSer' CGI handler of the Tenda AC1206 router (firmware v15.03.06.23). The vulnerability is triggered when the 'dips' parameter (and potentially 'username'/'password' parameters) is processed without adequate length validation. Specifically, the code uses 'strrchr' to find a period character and calculates a length for 'strncpy' based on the result; if the period is missing, the calculation can lead to a large copy operation that overflows the stack buffer. An unauthenticated attacker can exploit this by sending a crafted HTTP request to the affected endpoint, leading to a device crash (DoS) or potentially remote code execution.
Affected products
- Tenda (Shenzhen Tenda Technology Co., Ltd) AC1206 v15.03.06.23
Timeline
- 2026-03-10: other: CVE request submitted to MITRE
- 2026-06-06: disclosed: Public disclosure
- 2026-06-08: advisory: NVD published date