CVE-2004-1464

CRITICALNVD 5.99.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2023-05-19), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 5.9 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 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: 5%CVSS: 5.9Exploit: cisa kev · ssvc activeExposed: 0

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

Cisco IOS 12.2(15) and earlier allows remote attackers to cause a denial of service (refused VTY (virtual terminal) connections), via a crafted TCP connection to the Telnet or reverse Telnet port.

CVSS v3
5.9
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
5%
EPSS %ILE
91%
KEV
⚠ Exploited

Published

December 31, 2004

Last Modified

June 16, 2026

Advisory Details (5)

Auto-updated May 20, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet. Sources: cert.
cert🔴 Active Exploitation

VU#384230 - Cisco IOS fails to properly handle telnet connections

http://www.kb.cert.org/vuls/id/384230
generic
http://securitytracker.com/id?1011079
generic

About Secunia Research | Flexera

http://secunia.com/advisories/12395/
generic

IBM X-Force Exchange

https://exchange.xforce.ibmcloud.com/vulnerabilities/17131
generic
http://www.securityfocus.com/bid/11060

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 51× in last 7d / 222× 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.

Showing the most recent 100 of 683 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2004-1464?
CVE-2004-1464 is a critical vulnerability published on December 31, 2004. Cisco IOS 12.2(15) and earlier allows remote attackers to cause a denial of service (refused VTY (virtual terminal) connections), via a crafted TCP connection to the Telnet or reverse Telnet port.
When was CVE-2004-1464 disclosed?
CVE-2004-1464 was first published in the National Vulnerability Database on December 31, 2004, with the most recent update on June 16, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2004-1464 actively exploited?
Yes. CISA added CVE-2004-1464 to the Known Exploited Vulnerabilities catalog on May 19, 2023, affecting Cisco IOS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2004-1464?
CVE-2004-1464 has a CVSS v3 base score of 5.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2004-1464?
CVE-2004-1464 affects Cisco IOS. 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-2004-1464?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2004-1464, 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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