# Zyxel DSL CPE Devices: 2 exploited vulnerabilities (CVE-2024-40890, CVE-2024-40891) · pwn.watch

> CVE-2024-40890: Multiple Zyxel DSL CPE devices contain a post-authentication command injection vulnerability in the CGI program that could allow an authenticated attacker to execute OS commands via a crafted HTTP request. CVE-2024-40891: 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. Added to CISA KEV on 2025-02-11.

Page: https://pwn.watch/i/zyxel-dsl-cpe-devices-cve-2024-40890 · generated 2026-10-22T20:45:43.249Z

## Status
- Severity: high · status: closed · patch: unpatched
- Product: Zyxel DSL CPE Devices
- Started: 2025-02-11 · closed: 2025-02-11
- CVEs: CVE-2024-40890, CVE-2024-40891
- Affected: See vendor advisory / CISA notes (versions not always listed in KEV feed)
- Fixed in: None: CISA says the product is end-of-life; discontinue use

## Follow this incident
- RSS (one item per update): https://pwn.watch/i/zyxel-dsl-cpe-devices-cve-2024-40890/feed.xml
- JSON Feed: https://pwn.watch/i/zyxel-dsl-cpe-devices-cve-2024-40890/feed.json
- Full data (timeline, sources, posts, agentBrief): https://pwn.watch/i/zyxel-dsl-cpe-devices-cve-2024-40890.json
- This file: https://pwn.watch/i/zyxel-dsl-cpe-devices-cve-2024-40890/llms.txt

## Updates (newest first)
- 2025-02-11: CISA added CVE-2024-40890 to the KEV catalog (due 2025-03-04).
- 2025-02-11: CISA added CVE-2024-40891 to the KEV catalog (due 2025-03-04).

## Fix brief
# Security brief: Zyxel DSL CPE Devices: 2 exploited vulnerabilities (CVE-2024-40890, CVE-2024-40891)

Source: https://pwn.watch/i/zyxel-dsl-cpe-devices-cve-2024-40890 · status: closed (closed Feb 11, 2025) · severity: high · updated Feb 11, 2025

## Patch status
**UNPATCHED: no fixed release yet. Apply mitigations and watch for updates.**

## What it is
CVE-2024-40890: Multiple Zyxel DSL CPE devices contain a post-authentication command injection vulnerability in the CGI program that could allow an authenticated attacker to execute OS commands via a crafted HTTP request. CVE-2024-40891: 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. Added to CISA KEV on 2025-02-11.

Severity detail: CVSS 8.8 (CNA, v3.1); actively exploited (CISA KEV)

- Product: Zyxel DSL CPE Devices
- CVE / advisory ids: CVE-2024-40890, CVE-2024-40891

## Affected versions
- See vendor advisory / CISA notes (versions not always listed in KEV feed)

## Check whether you're affected
No generic command applies (the product is a hosted service, appliance or desktop app). Check the installed version in its admin UI / About screen and compare with the versions above.

## Fix
Upgrade to one of these fixed versions (or later on the same branch):
- None: CISA says the product is end-of-life; discontinue use

After upgrading, re-run the checks above and redeploy/restart the affected services.

## Mitigations
The data marks this as unpatched. Until every affected component is fixed, apply the vendor mitigations from the advisories below (restrict network exposure of the affected service, disable the vulnerable feature if the advisory allows).

## Latest updates
- Feb 11, 2025: CISA added CVE-2024-40890 to the KEV catalog (due 2025-03-04).
- Feb 11, 2025: CISA added CVE-2024-40891 to the KEV catalog (due 2025-03-04).

## Advisories
- [Zyxel advisory: Zyxel DSL CPE Devices](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) (Zyxel)
- [Zyxel advisory: Zyxel DSL CPE Devices](https://www.zyxel.com/service-provider/global/en/security-advisories/zyxel-security-advisory-command-injection-insecure-in-certain-legacy-dsl-cpe-02-04-2025) (Zyxel)
- [NVD: CVE-2024-40890](https://nvd.nist.gov/vuln/detail/CVE-2024-40890) (NVD)
- [NVD: CVE-2024-40891](https://nvd.nist.gov/vuln/detail/CVE-2024-40891) (NVD)
- [CISA Known Exploited Vulnerabilities Catalog](https://www.cisa.gov/known-exploited-vulnerabilities-catalog) (CISA)

## Caveats
Derived from CISA KEV JSON feed catalogVersion 2026.10.21. CVSS from the CVE record (cvelistV5). Exact affected/fixed version strings are not always in the KEV record; verify against the vendor advisory URL. startedAt uses dateAdded (exploitation may have begun earlier; many entries are older CVEs newly confirmed as exploited in 2025).

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Machine-readable: https://pwn.watch/i/zyxel-dsl-cpe-devices-cve-2024-40890.json · all incidents: https://pwn.watch/incidents.json. Verify against the vendor advisory before changing production systems.