Zyxel DSL CPE OS Command Injection Vulnerability

HIGH 8.8EXPLOITED (CISA KEV)CVE-2024-40890 · Published 04/02/2025 · updated 17/06/2026

Zyxel DSL CPE OS Command Injection Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 11/02/2025. Patch affected systems as an emergency.

In short

CVE-2024-40890 is a HIGH (CVSS 8.8) vulnerability.
Exploited in the wild: CISA added it to the KEV catalog on 11/02/2025.
Chance of exploitation in the next 30 days (EPSS): 20.7%, higher than 97.5% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
DSL CPE Devices Zyxel	Versions not published yet (product named by CISA KEV)

Description

**UNSUPPORTED WHEN ASSIGNED** A post-authentication command injection vulnerability in the CGI program 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 by sending a crafted HTTP POST request.

References

zyxel.com/global/en/support/security-advisories/zyxel-security-advisory-for-command-injection-and-insecure-default-credentials-vulnerabilities-in-certain-legacy-dsl-cpe-02-04-2025 · Vendor Advisory
cisa.gov/known-exploited-vulnerabilities-catalog · US Government Resource
CISA KEV · CVE-2024-40890

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