Quick answers
- Is CVE-2026-5604 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-5604 being exploited in the wild.
- How severe is CVE-2026-5604?
- High severity, with a CVSS score of 8.8, published 5 April 2026.
- Which products and versions are affected?
- Tenda CH22 1.0.0.1.
- Is there a fix for CVE-2026-5604?
- 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-2026-5604 attacked?
- It is attacked over the network, in device firmware.
- Am I affected by CVE-2026-5604?
- 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 'formCertLocalPrecreate' function within the '/goform/CertLocalPrecreate' endpoint of Tenda CH22 firmware version 1.0.0.1. The root cause is the unsafe use of the 'sprintf' function, which processes the user-supplied 'standard' parameter without adequate length validation, allowing the stack-based buffer 's' to be overwritten. A remote attacker with low privileges can exploit this by sending a crafted POST request. Successful exploitation can lead to a Denial of Service (DoS) or Remote Code Execution (RCE). A public Proof of Concept (PoC) has been released.
Affected products
- Tenda CH22 1.0.0.1
Timeline
- 2026-04-05: disclosed
- 2026-04-05: advisory