CVE-2023-22917 Memory corruption in ATP series firmware

High 7.5 Published 24 Apr 2023 Updated 12 Feb 2025

Remote unauthenticated attackers can cause a denial of service on Zyxel firewalls by uploading a crafted configuration file that triggers a buffer overflow.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-22917?

CVE-2023-22917 is a high-severity memory corruption vulnerability in Zyxel ATP series firmware, published on 24 Apr 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A buffer overflow vulnerability in the “sdwan_iface_ipc” binary of Zyxel ATP series firmware versions 5.10 through 5.32, USG FLEX series firmware versions 5.00 through 5.32, USG FLEX 50(W) firmware versions 5.10 through 5.32, USG20(W)-VPN firmware versions 5.10 through 5.32, and VPN series firmware versions 5.00 through 5.35, which could allow a remote unauthenticated attacker to cause a core dump with a request error message on a vulnerable device by uploading a crafted configuration file.

Weakness: CWE-120

Which versions are affected by CVE-2023-22917?

It affects 18 products.

Products include Zyxel Atp100 Firmware, Zyxel Atp100w Firmware, Zyxel Atp200 Firmware, Zyxel Atp500 Firmware, Zyxel Atp700 Firmware, Zyxel Atp800 Firmware and 12 more.

How do I fix CVE-2023-22917?

No fix has been published for CVE-2023-22917 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-2023-22917 being exploited?

There is no known exploitation of CVE-2023-22917 in the wild and no public exploit code.

Sources

Also known as GHSA-34gf-pfjm-cq2w.