Quick answers
- Is CVE-2026-5204 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-5204 being exploited in the wild.
- How severe is CVE-2026-5204?
- High severity, with a CVSS score of 8.8, published 31 March 2026.
- Which products and versions are affected?
- Tenda CH22 1.0.0.1.
- Is there a fix for CVE-2026-5204?
- 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-2026-5204 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-5204?
- Check whether you run Tenda CH22 or Tenda Ch22 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 Tenda CH22 firmware version 1.0.0.1. The flaw is located within the 'formWebTypeLibrary' function in the '/goform/webtypelibrary' component of the Parameter Handler. The root cause is an unsafe 'strcat' operation on the user-provided 'webSiteId' parameter without adequate length validation. A remote attacker with low privileges can trigger this overflow by sending a crafted POST request, potentially leading to remote code execution (RCE) or a denial of service (DoS) condition. A proof-of-concept exploit has been publicly disclosed.
Affected products
- Tenda CH22 1.0.0.1
Timeline
- 2026-03-31: disclosed: Vulnerability disclosed and CVE assigned
- 2026-03-31: advisory: Initial advisory published by VulDB