CVE-2022-34746 Weak cryptography in Zyxel GS1900 series firmware

Medium 5.9 Published 20 Sep 2022 Updated 29 May 2025

An attacker can retrieve private keys by factoring weak RSA moduli in the web interface, potentially leading to unauthorized access.

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-2022-34746?

CVE-2022-34746 is a medium-severity vulnerability in Zyxel GS1900 series firmware, published on 20 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An insufficient entropy vulnerability caused by the improper use of randomness sources with low entropy for RSA key pair generation was found in Zyxel GS1900 series firmware versions prior to V2.70. This vulnerability could allow an unauthenticated attacker to retrieve a private key by factoring the RSA modulus N in the certificate of the web administration interface.

Weakness: CWE-331

Which versions are affected by CVE-2022-34746?

It affects 10 products.

Products include Zyxel Gs1900-10hp Firmware, Zyxel Gs1900-16 Firmware, Zyxel Gs1900-24 Firmware, Zyxel Gs1900-24e Firmware, Zyxel Gs1900-24ep Firmware, Zyxel Gs1900-24hpv2 Firmware and 4 more.

How do I fix CVE-2022-34746?

No fix has been published for CVE-2022-34746 yet. Limit exposure of the affected software until one is available.

Is CVE-2022-34746 being exploited?

There is no known exploitation of CVE-2022-34746 in the wild and no public exploit code.

Sources

Also known as GHSA-cqpc-c229-h8hr.