CVE-2024-40891

CRITICALNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2025-02-11), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 22%CVSS: 8.8Exploit: cisa kev · ssvc active · epss top5pctExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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
8.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
22%
EPSS %ILE
97%
KEV
⚠ Exploited

Published

February 4, 2025

Last Modified

October 27, 2025

Advisory Details (2)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

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

Zyxel security advisory for command injection and insecure default credentials vulnerabilities in certain legacy DSL CPE | Zyxel Networks

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

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 0× in last 7d / 0× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-28 04:15 UTCGHSA enrichment
  2. 2026-07-28 00:02 UTCGHSA enrichment
  3. 2026-07-27 19:49 UTCGHSA enrichment
  4. 2026-07-27 19:24 UTCCISA KEV update
  5. 2026-07-27 17:17 UTCCISA KEV update
  6. 2026-07-27 15:38 UTCEG score recompute
  7. 2026-07-27 15:38 UTCGHSA enrichment
  8. 2026-07-27 14:11 UTCEPSS rescore
  9. 2026-07-27 11:26 UTCGHSA enrichment
  10. 2026-07-27 07:14 UTCGHSA enrichment
  11. 2026-07-27 03:01 UTCGHSA enrichment
  12. 2026-07-26 22:49 UTCGHSA enrichment
  13. 2026-07-26 18:37 UTCEG score recompute
  14. 2026-07-26 18:37 UTCGHSA enrichment
  15. 2026-07-26 14:53 UTCEPSS rescore
  16. 2026-07-26 14:53 UTCEPSS rescore
  17. 2026-07-26 14:26 UTCEG score recompute
  18. 2026-07-26 14:26 UTCGHSA enrichment
  19. 2026-07-26 10:14 UTCGHSA enrichment
  20. 2026-07-26 06:01 UTCGHSA enrichment
  21. 2026-07-26 01:49 UTCEG score recompute
  22. 2026-07-26 01:49 UTCGHSA enrichment
  23. 2026-07-25 14:16 UTCEPSS rescore
  24. 2026-07-24 14:16 UTCEPSS rescore
  25. 2026-07-23 14:17 UTCEPSS rescore
Show 75 more
  1. 2026-07-23 02:39 UTCEG score recompute
  2. 2026-07-22 20:27 UTCGHSA enrichment
  3. 2026-07-22 19:40 UTCCISA KEV update
  4. 2026-07-22 16:15 UTCEG score recompute
  5. 2026-07-22 16:15 UTCGHSA enrichment
  6. 2026-07-22 14:07 UTCEPSS rescore
  7. 2026-07-22 12:03 UTCGHSA enrichment
  8. 2026-07-22 07:51 UTCGHSA enrichment
  9. 2026-07-22 03:39 UTCGHSA enrichment
  10. 2026-07-21 23:25 UTCGHSA enrichment
  11. 2026-07-21 18:39 UTCEG score recompute
  12. 2026-07-21 18:39 UTCGHSA enrichment
  13. 2026-07-21 15:23 UTCEPSS rescore
  14. 2026-07-21 15:23 UTCEPSS rescore
  15. 2026-07-21 14:37 UTCCISA KEV update
  16. 2026-07-21 14:27 UTCGHSA enrichment
  17. 2026-07-21 10:16 UTCGHSA enrichment
  18. 2026-07-21 06:03 UTCGHSA enrichment
  19. 2026-07-21 01:50 UTCGHSA enrichment
  20. 2026-07-20 21:38 UTCGHSA enrichment
  21. 2026-07-20 17:26 UTCEG score recompute
  22. 2026-07-20 17:26 UTCGHSA enrichment
  23. 2026-07-20 17:06 UTCEPSS rescore
  24. 2026-07-20 13:15 UTCGHSA enrichment
  25. 2026-07-20 09:03 UTCGHSA enrichment
  26. 2026-07-20 04:51 UTCGHSA enrichment
  27. 2026-07-19 20:28 UTCGHSA enrichment
  28. 2026-07-19 16:16 UTCEG score recompute
  29. 2026-07-19 16:16 UTCGHSA enrichment
  30. 2026-07-19 14:30 UTCEPSS rescore
  31. 2026-07-19 14:30 UTCEPSS rescore
  32. 2026-07-19 12:04 UTCGHSA enrichment
  33. 2026-07-19 07:53 UTCGHSA enrichment
  34. 2026-07-19 03:41 UTCEG score recompute
  35. 2026-07-19 03:41 UTCGHSA enrichment
  36. 2026-07-19 02:28 UTCEPSS rescore
  37. 2026-07-19 02:28 UTCEPSS rescore
  38. 2026-07-18 23:28 UTCGHSA enrichment
  39. 2026-07-18 19:16 UTCGHSA enrichment
  40. 2026-07-18 15:04 UTCGHSA enrichment
  41. 2026-07-18 10:52 UTCEG score recompute
  42. 2026-07-18 10:52 UTCGHSA enrichment
  43. 2026-07-18 10:03 UTCEPSS rescore
  44. 2026-07-18 10:03 UTCEPSS rescore
  45. 2026-07-18 06:40 UTCGHSA enrichment
  46. 2026-07-18 02:28 UTCGHSA enrichment
  47. 2026-07-17 22:16 UTCGHSA enrichment
  48. 2026-07-17 18:04 UTCGHSA enrichment
  49. 2026-07-17 13:53 UTCGHSA enrichment
  50. 2026-07-17 09:42 UTCEG score recompute
  51. 2026-07-17 09:42 UTCGHSA enrichment
  52. 2026-07-17 05:30 UTCGHSA enrichment
  53. 2026-07-17 01:18 UTCGHSA enrichment
  54. 2026-07-16 21:07 UTCGHSA enrichment
  55. 2026-07-16 17:04 UTCCISA KEV update
  56. 2026-07-16 17:02 UTCEPSS rescore
  57. 2026-07-16 16:55 UTCGHSA enrichment
  58. 2026-07-16 12:43 UTCGHSA enrichment
  59. 2026-07-16 08:29 UTCGHSA enrichment
  60. 2026-07-16 04:18 UTCGHSA enrichment
  61. 2026-07-16 00:06 UTCGHSA enrichment
  62. 2026-07-15 19:54 UTCGHSA enrichment
  63. 2026-07-15 16:56 UTCEPSS rescore
  64. 2026-07-15 16:56 UTCEPSS rescore
  65. 2026-07-15 16:49 UTCCISA KEV update
  66. 2026-07-15 15:42 UTCGHSA enrichment
  67. 2026-07-15 15:04 UTCCISA KEV update
  68. 2026-07-15 11:31 UTCGHSA enrichment
  69. 2026-07-15 07:19 UTCGHSA enrichment
  70. 2026-07-15 03:08 UTCGHSA enrichment
  71. 2026-07-15 01:59 UTCEPSS rescore
  72. 2026-07-15 01:59 UTCEPSS rescore
  73. 2026-07-14 22:56 UTCGHSA enrichment
  74. 2026-07-14 18:45 UTCGHSA enrichment
  75. 2026-07-14 18:05 UTCCISA KEV update

Frequently asked(6)

What is CVE-2024-40891?
CVE-2024-40891 is a critical vulnerability published on February 4, 2025. 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…
When was CVE-2024-40891 disclosed?
CVE-2024-40891 was first published in the National Vulnerability Database on February 4, 2025, with the most recent update on October 27, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2024-40891 actively exploited?
Yes. CISA added CVE-2024-40891 to the Known Exploited Vulnerabilities catalog on February 11, 2025, affecting Zyxel DSL CPE Devices. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2024-40891?
CVE-2024-40891 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2024-40891?
CVE-2024-40891 affects Zyxel DSL CPE Devices. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2024-40891?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2024-40891, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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