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
91.5%
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 55× in last 7d / 214× 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 423 total refreshes for this CVE.

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