CVE-2024-40891 Zyxel DSL CPE OS Command Injection
Authenticated attackers can execute OS commands on legacy Zyxel DSL CPE devices via Telnet management commands.
- Exploited in the wild
- Since 11 Feb 2025
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2024-40891?
CVE-2024-40891 is a high-severity command injection vulnerability in Zyxel VMG4325-B10A firmware, published on 4 Feb 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
**UNSUPPORTED WHEN ASSIGNED** A post-authentication command injection vulnerability in the management commands of the legacy DSL CPE Zyxel VMG4325-B10A firmware version 1.00(AAFR.4)C0_20170615 could allow an authenticated attacker to execute operating system (OS) commands on an affected device via Telnet.
Weakness: CWE-78
Which versions are affected by CVE-2024-40891?
It affects 14 products.
Products include Zyxel Sbg3300-N000 Firmware, Zyxel Sbg3300-Nb00 Firmware, Zyxel Sbg3500-N000 Firmware, Zyxel Sbg3500-Nb00 Firmware, Zyxel Vmg1312-B10a Firmware, Zyxel Vmg1312-B10b Firmware and 8 more.
How do I fix CVE-2024-40891?
No fix has been published for CVE-2024-40891 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 4 Mar 2025.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2024-40891 being exploited?
Yes. Attackers have exploited CVE-2024-40891 in the wild since at least 11 Feb 2025.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Zyxel VMG4325-B10A firmware
Sources
Also known as GHSA-pm4h-579g-cgqq.