CVE-2024-40891

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.

CVSS v3.1 Score

8.8

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Feb 11, 2025 Remediation due: Mar 4, 2025

Weakness Type (CWE)

CWE-78 OS Command Injection

Affected Products

Vendor	Product	Versions
zyxel	vmg1312-b10a_firmware	All
zyxel	vmg1312-b10a	All
zyxel	vmg1312-b10b_firmware	All
zyxel	vmg1312-b10b	All
zyxel	vmg1312-b10e_firmware	All
zyxel	vmg1312-b10e	All
zyxel	vmg3312-b10a_firmware	All
zyxel	vmg3312-b10a	All
zyxel	vmg3313-b10a_firmware	All
zyxel	vmg3313-b10a	All
zyxel	vmg3926-b10b_firmware	All
zyxel	vmg3926-b10b	All
zyxel	vmg4325-b10a_firmware	All
zyxel	vmg4325-b10a	All
zyxel	vmg4380-b10a_firmware	All
zyxel	vmg4380-b10a	All
zyxel	vmg8324-b10a_firmware	All
zyxel	vmg8324-b10a	All
zyxel	vmg8924-b10a_firmware	All
zyxel	vmg8924-b10a	All
zyxel	sbg3300-n000_firmware	All
zyxel	sbg3300-n000	All
zyxel	sbg3300-nb00_firmware	All
zyxel	sbg3300-nb00	All
zyxel	sbg3500-n000_firmware	All
zyxel	sbg3500-n000_firmware	All
zyxel	sbg3500-nb00_firmware	All
zyxel	sbg3500-nb00	All

References

Advisories & Patches

https://www.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

Other References

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2024-40891

Frequently Asked Questions

What is CVE-2024-40891? +

**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. It has a CVSS v3.1 base score of 8.8 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2024-40891? +

CVE-2024-40891 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2024-40891? +

CVE-2024-40891 affects products from zyxel, specifically: sbg3300-n000, sbg3300-n000_firmware, sbg3300-nb00, sbg3300-nb00_firmware, sbg3500-n000_firmware, sbg3500-nb00, sbg3500-nb00_firmware, vmg1312-b10a, vmg1312-b10a_firmware, vmg1312-b10b, vmg1312-b10b_firmware, vmg1312-b10e, vmg1312-b10e_firmware, vmg3312-b10a, vmg3312-b10a_firmware, vmg3313-b10a, vmg3313-b10a_firmware, vmg3926-b10b, vmg3926-b10b_firmware, vmg4325-b10a, vmg4325-b10a_firmware, vmg4380-b10a, vmg4380-b10a_firmware, vmg8324-b10a, vmg8324-b10a_firmware, vmg8924-b10a, vmg8924-b10a_firmware. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-40891? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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