# CVE-2026-5547: Tenda AC10 OS command injection in formAddMacfilterRule

Source: https://junglewise.ai/threats/cve-2026-5547-tenda-ac10-os-command-injection-in-formaddmacfilterrule  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-05. Updated: 2026-07-24  
License: CC BY 4.0 with a link back

CVE-2026-5547 · Severity: medium · CVSS 6.3 · Published 2026-04-05

A vulnerability exists in the Tenda AC10 router, a device used to provide wireless internet connectivity for homes and small offices. An attacker with valid login credentials can exploit this flaw to take complete control of the router. This could allow them to intercept internet traffic, disrupt network services, or use the device as a foothold to attack other devices on the local network.

Technologies: [Tenda AC10](https://junglewise.ai/threats/technologies/ac10), [Tenda AC10 firmware](https://junglewise.ai/threats/technologies/ac10-firmware). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2026-5547 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-5547 being exploited in the wild.

**How severe is CVE-2026-5547?** Medium severity, with a CVSS score of 6.3, published 5 April 2026.

**Which products and versions are affected?** Tenda AC10 16.03.10.10_multi_TDE01.

**Is there a fix for CVE-2026-5547?** 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-2026-5547 attacked?** It is attacked over the network, in an operating system.

**Am I affected by CVE-2026-5547?** 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

An OS command injection vulnerability exists in the Tenda AC10 router firmware version 16.03.10.10_multi_TDE01. The flaw is located within the 'formAddMacfilterRule' function (and approximately 20 other functions) in the '/bin/httpd' binary. The root cause is the improper neutralization of user-supplied input from 'websGetVar()' before it is passed to 'doSystemCmd()', which executes shell commands. An authenticated attacker can exploit this over the network by sending crafted requests to the affected endpoints. Successful exploitation results in arbitrary command execution with root-level privileges. No official patch is currently detailed in the advisory, though remediation suggests sanitizing shell metacharacters and using allowlist validation.

## 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

## References

- [https://github.com/somanyerrors/tenda-ac10v4-vulnerabilities/blob/main/findings/CRITICAL-03-command-injection-formaddmacfilterrule.md](https://github.com/somanyerrors/tenda-ac10v4-vulnerabilities/blob/main/findings/CRITICAL-03-command-injection-formaddmacfilterrule.md)
- [https://vuldb.com/submit/782296](https://vuldb.com/submit/782296)
- [https://vuldb.com/vuln/355311](https://vuldb.com/vuln/355311)
- [https://vuldb.com/vuln/355311/cti](https://vuldb.com/vuln/355311/cti)
- [https://www.tenda.com.cn/](https://www.tenda.com.cn/)

## Related threats

- [Tenda AC10 stack buffer overflow in fromAdvSetLanip](https://junglewise.ai/threats/cve-2026-16248-tenda-ac10-stack-buffer-overflow-in-fromadvsetlanip)
- [Tenda AC10 v3 buffer overflow in UploadCfg](https://junglewise.ai/threats/cve-2026-51380-tenda-ac10-v3-buffer-overflow-in-uploadcfg)
- [Tenda Firmware authentication backdoor in httpd login function](https://junglewise.ai/threats/cve-2026-11405-tenda-firmware-authentication-backdoor-in-httpd-login-function)
- [Tenda AC10 stack buffer overflow in fromSysToolChangePwd](https://junglewise.ai/threats/cve-2026-5550-tenda-ac10-stack-buffer-overflow-in-fromsystoolchangepwd)
- [Tenda AC10 hard-coded RSA private key in webroot](https://junglewise.ai/threats/cve-2026-5549-tenda-ac10-hard-coded-rsa-private-key-in-webroot)