CVE-2021-31624 Memory corruption in n/a

High 8.8 Published 29 Oct 2021 Updated 9 Jul 2026

Attackers can execute arbitrary code on Tenda AC9 routers via a buffer overflow in the urls parameter.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2021-31624?

CVE-2021-31624 is a high-severity memory corruption vulnerability in n/a, published on 29 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Buffer Overflow vulnerability in Tenda AC9 V1.0 through V15.03.05.19(6318), and AC9 V3.0 V15.03.06.42_multi, allows attackers to execute arbitrary code via the urls parameter.

Weakness: CWE-120

Which versions are affected by CVE-2021-31624?

It affects 1 product.

Products include Tendacn Ac9 Firmware.

How do I fix CVE-2021-31624?

No fix has been published for CVE-2021-31624 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-31624 being exploited?

There is no known exploitation of CVE-2021-31624 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Sources

Also known as GHSA-qvhc-5474-w39h.