# CVE-2024-40891: Zyxel DSL CPE OS Command Injection Vulnerability

Source: https://junglewise.ai/threats/cve-2024-40891-zyxel-dsl-cpe-os-command-injection-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-02-11. Updated: 2026-05-09  
License: CC BY 4.0 with a link back

CVE-2024-40891 · Severity: critical · CVSS 8.8 · Exploited in the wild · Published 2025-02-11

Multiple legacy Zyxel DSL CPE devices contain a post-authentication command injection vulnerability in management commands. An authenticated attacker can execute arbitrary operating system commands on the affected device via Telnet.

Vendors: [Zyxel](https://junglewise.ai/threats/vendors/zyxel).

## Quick answers

**Is CVE-2024-40891 exploited in the wild?** Yes. CVE-2024-40891 is known to be exploited in the wild, first recorded on 11 February 2025. Treat it as urgent.

**How severe is CVE-2024-40891?** Critical severity, with a CVSS score of 8.8, published 11 February 2025.

**Which products and versions are affected?** Zyxel Corporation VMG4325-B10A firmware 1.00(AAFR.4)C0_20170615; Zyxel Corporation SBG3300-N000; Zyxel Corporation SBG3300-NB00; Zyxel Corporation SBG3500-N000; and 10 more.

**Is there a fix for CVE-2024-40891?** 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-2024-40891 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2024-40891?** Check whether you run Zyxel DSL CPE Devices. 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.

## Affected products

- Zyxel Corporation VMG4325-B10A firmware 1.00(AAFR.4)C0_20170615
- Zyxel Corporation SBG3300-N000
- Zyxel Corporation SBG3300-NB00
- Zyxel Corporation SBG3500-N000
- Zyxel Corporation SBG3500-NB00
- Zyxel Corporation VMG1312-B10A
- Zyxel Corporation VMG1312-B10B
- Zyxel Corporation VMG1312-B10E
- Zyxel Corporation VMG3312-B10A
- Zyxel Corporation VMG3313-B10A
- Zyxel Corporation VMG3926-B10B
- Zyxel Corporation VMG4380-B10A
- Zyxel Corporation VMG8324-B10A
- Zyxel Corporation VMG8924-B10A

## Timeline

- 2025-02-04: disclosed: Zyxel security advisory published
- 2025-02-11: kev added: Added to CISA Known Exploited Vulnerabilities Catalog

## Related threats

- [Zyxel DSL CPE OS Command Injection Vulnerability](https://junglewise.ai/threats/cve-2024-40890-zyxel-dsl-cpe-os-command-injection-vulnerability)