CVE-2004-1464

MEDIUMNVD 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 — 4 sources updated this weekExploited in the wild
5.9
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 5%CVSS: 5.9Exploit: NoneExposed: 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)
EPSS
91.4%
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 90× in last 7d / 388× 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 616 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2004-1464?
CVE-2004-1464 is a medium 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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