# CVE-2025-51089: Tenda AC8V4 heap overflow in GetParentControlInfo

Source: https://junglewise.ai/threats/cve-2025-51089-tenda-ac8v4-heap-overflow-in-getparentcontrolinfo  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-07-24. Updated: 2026-07-05  
License: CC BY 4.0 with a link back

CVE-2025-51089 · Severity: medium · CVSS 6.5 · Published 2025-07-24

A security vulnerability exists in the Tenda AC8V4 home router, a device used to provide wireless internet access. An attacker can send a specially crafted request to the router's management interface to cause a system crash or potentially gain unauthorized control over the device. This could lead to a loss of internet connectivity or allow an attacker to disrupt network operations.

Technologies: [Tenda Ac8](https://junglewise.ai/threats/technologies/ac8), [Tenda Ac8 Firmware](https://junglewise.ai/threats/technologies/ac8-firmware). Vendors: [Tenda](https://junglewise.ai/threats/vendors/tenda).

## Quick answers

**Is CVE-2025-51089 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-51089 being exploited in the wild.

**How severe is CVE-2025-51089?** Medium severity, with a CVSS score of 6.5, published 24 July 2025.

**Which products and versions are affected?** Tenda AC8V4 firmware V16.03.34.06.

**Is there a fix for CVE-2025-51089?** 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-2025-51089 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2025-51089?** Check whether you run Tenda Ac8, Tenda Ac8 Firmware or Tenda AC8V4 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 heap-based buffer overflow (CWE-122) exists in the Tenda AC8V4 router firmware version V16.03.34.06. The vulnerability is located within the 'GetParentControlInfo' function, which processes POST requests to the '/goform/GetParentControlInfo' endpoint. The application fails to validate the length of the 'mac' parameter before copying it into a heap-allocated buffer using the 'strcpy' function. A remote, unauthenticated attacker can exploit this by sending an oversized 'mac' string, leading to memory corruption, a denial-of-service (DoS) condition, or potentially arbitrary code execution. A proof-of-concept exploit demonstrating the crash is publicly available.

## Affected products

- Tenda AC8V4 firmware V16.03.34.06

## Timeline

- 2025-07-24: advisory: NVD publication date

## References

- [https://github.com/TL-SN/IOT/blob/main/Tenda/Tenda-AC8v4%20%20V16.03.34.06/CVE-2025-51089.md](https://github.com/TL-SN/IOT/blob/main/Tenda/Tenda-AC8v4%20%20V16.03.34.06/CVE-2025-51089.md)

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- [Tenda AC8 buffer overflow in UPnP service](https://junglewise.ai/threats/cve-2025-61498-tenda-ac8-buffer-overflow-in-upnp-service)
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- [Tenda AC8V4 stack overflow in saveParentControlInfo](https://junglewise.ai/threats/cve-2025-51087-tenda-ac8v4-stack-overflow-in-saveparentcontrolinfo)
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