CVE-2024-40891

Zyxel DSL CPE Devices: DSL CPE OS Command Injection

As of , CVE-2024-40891 in Zyxel DSL CPE Devices is on CISA's list of exploited vulnerabilities: CISA listed it on . Our patch-first group: Patch soon.

Exploited
Yes: CISA listed it on 11 February 2025
US federal deadline
4 March 202521 days after CISA listed it. US federal civilian agencies must fix it by then.
Used in ransomware campaigns
Not known to CISA
EPSS score
0.22Higher than 97% of the CVEs EPSS scores. EPSS estimates the chance of exploitation activity in the next 30 days.
EPSS when listed
0.00 on 11 February 2025EPSS on the day CISA listed it.
Public exploit
None foundNeither Metasploit nor Exploit-DB lists one.
Fix
Vendor advice: www.zyxel.comLinks below, from CISA's entry.

What CISA says to do

The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization if a current mitigation is unavailable.

CISA's required action

What the flaw is

Multiple Zyxel DSL CPE devices contain a post-authentication command injection vulnerability in the management commands that could allow an authenticated attacker to execute OS commands via Telnet.

CISA's 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.

The CVE record's description, from Zyxel

CVE published
4 February 2025
Assigned by
Zyxel
CVSS
8.8 High (CVSS 3.1, from the CNA)
CWE-78
Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CISA SSVC, exploitation
active
CISA SSVC, automatable
no
CISA SSVC, technical impact
total

Timeline

  1. The CVE record was published.
  2. CISA added it to its list of exploited vulnerabilities.
  3. CISA changed its entry. Edited: notes.
  4. The US federal deadline to fix it.

DSL CPE Devices: other exploited entries

VulnerabilityProductOur groupListedDeadlineEPSS
CVE-2024-40890DSL CPE OS Command InjectionZyxel DSL CPE DevicesPatch soon0.21

Read further