# CVE-2026-15543: Tenda CH22 buffer overflow in formCertListInfo

Source: https://junglewise.ai/threats/cve-2026-15543-tenda-ch22-buffer-overflow-in-formcertlistinfo  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-07-13. Updated: 2026-07-13  
License: CC BY 4.0 with a link back

CVE-2026-15543 · Severity: high · CVSS 8.8 · Published 2026-07-13

A vulnerability exists in the Tenda CH22 router that could allow an attacker to disrupt or take control of the device. By sending a specially crafted request to the device's management interface, an attacker can cause a system crash or potentially execute unauthorized commands. This could lead to a total loss of network availability or unauthorized access to data passing through the router.

Technologies: [Tenda CH22](https://junglewise.ai/threats/technologies/ch22). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-15543 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-15543 being exploited in the wild.

**How severe is CVE-2026-15543?** High severity, with a CVSS score of 8.8, published 13 July 2026.

**Which products and versions are affected?** Tenda CH22 1.0.0.1.

**Is there a fix for CVE-2026-15543?** 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-2026-15543 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-15543?** Check whether you run Tenda CH22 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 router, specifically within the 'formCertListInfo' function located in the '/goform/CertListInfo' file. The vulnerability is triggered by improper validation of the 'Name' argument, allowing an attacker to overwrite memory. This attack can be launched remotely by an authenticated user (PR:L). Successful exploitation can lead to arbitrary code execution or a complete denial of service (DoS) of the device. Public exploit code is reportedly available, increasing the risk of exploitation.

## Affected products

- Tenda CH22 1.0.0.1

## Timeline

- 2026-07-13: disclosed: Vulnerability disclosed via VulDB and NVD

## References

- [https://candle-throne-f75.notion.site/Tenda-CH22-formCertListInfo-377df0aa11858088aabaeb0f5e1909c9](https://candle-throne-f75.notion.site/Tenda-CH22-formCertListInfo-377df0aa11858088aabaeb0f5e1909c9)
- [https://vuldb.com/cve/CVE-2026-15543](https://vuldb.com/cve/CVE-2026-15543)
- [https://vuldb.com/submit/855077](https://vuldb.com/submit/855077)
- [https://vuldb.com/vuln/377893](https://vuldb.com/vuln/377893)
- [https://vuldb.com/vuln/377893/cti](https://vuldb.com/vuln/377893/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

## Related threats

- [Tenda CH22 command injection in formexeCommand](https://junglewise.ai/threats/cve-2026-78141-tenda-ch22-command-injection-in-formexecommand)
- [Tenda CH22 command injection in editFileName](https://junglewise.ai/threats/cve-2026-78063-tenda-ch22-command-injection-in-editfilename)
- [Tenda CH22 command injection in formcreateFileName](https://junglewise.ai/threats/cve-2026-77031-tenda-ch22-command-injection-in-formcreatefilename)
- [A vulnerability was detected in Tenda CH22 1.0.0.6(468). This issue affects the function R7WebsSecurityHandlerfunction…](https://junglewise.ai/threats/cve-2026-5962-a-vulnerability-was-detected-in-tenda-ch22-1-0-0-6-468-this-issue)
- [Tenda CH22 stack buffer overflow in formWrlExtraSet](https://junglewise.ai/threats/cve-2026-5605-tenda-ch22-stack-buffer-overflow-in-formwrlextraset)