CVE-2024-40891
Exploited in the wild. In CISA KEV since 2025‑02‑11. A vendor fix is available.
What to do
The vendor has published a fix. Version details are below where the sources state them.
What it is
From the CVE record
**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.
In plain language
No plain-language summary for this CVE yet.
Exploitation
Where each signal puts this CVE on the scale from published to confirmed exploited.
- CISA KEV
Listed as exploited in the wild since 2025-02-11.
US federal agencies must remediate by 2025-03-04.
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.
- Public exploits
No public exploit or proof of concept found in the sources we track.
- EPSS
22% chance of exploitation activity in the next 30 days, which ranks it in the 98th percentile of scored CVEs.
Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.
- Attention now
Sustained, driven by in-the-wild reports.
Lifecycle
8 events over 506 days, from the signal feeds we watch.
- OpenVAS check added
- EPSS band changehigh → moderate
- Patch availablerecord updated
- Added to CISA KEV
- Publishedweakness classified, att&ck mapped
Affected products
- VMG4325-B10A firmwareNetworking Infrastructure
- Zyxel CPE SeriesNetworking Infrastructure
- vmg1312-b10a firmwareNetworking Infrastructure
- vmg1312-b10b firmwareNetworking Infrastructure
- vmg1312-b10e firmwareNetworking Infrastructure
- vmg3312-b10a firmwareNetworking Infrastructure
- vmg3313-b10a firmwareNetworking Infrastructure
- vmg3926-b10b firmwareNetworking Infrastructure
And 8 more affected products. See all after sign-in
Technical detail
CVSS 3.1 vector
Open in the CVSS calculatorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Scored 8.8 by NVD.
How it is reached
- Attack Vector NetworkExploitable remotely over the network without any special conditions
- Attack Complexity LowNo special conditions — the attack can be reliably reproduced
- Privileges Required LowRequires basic user-level privileges
- User Interaction NoneNo user interaction needed — fully automated exploitation
Scope
- Scope UnchangedImpact is limited to the vulnerable component itself
Impact if exploited
- Confidentiality HighTotal information disclosure — all data in the component is compromised
- Integrity HighTotal loss of integrity — attacker can modify any data in the component
- Availability HighTotal denial of service — the component is completely unavailable
Weaknesses
ATT&CK techniques
Mapped from the weaknesses above (CWE to ATT&CK), not observed in attacks.
Sources
References in the record
- 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
- bleepingcomputer.com/news/security/hackers-exploit-critical-unpatched-flaw-in-zyxel-cpe-devices/&
- vulncheck.com/signin?redirect=/cve/CVE-2024-40891&
And 4 more references. See all after sign-in
In the news
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We'll flag the next CVE, public exploit or patch for VMG4325-B10A Firmware, not every advisory. This one: actively exploited.
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