CVE-2017-6663

MEDIUMNVD 6.59.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 6.5 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
6.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 2%CVSS: 6.5Exploit: NoneExposed: 0

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

A vulnerability in the Autonomic Networking feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause autonomic nodes of an affected system to reload, resulting in a denial of service (DoS) condition. More Information: CSCvd88936. Known Affected Releases: Denali-16.2.1 Denali-16.3.1.

CVSS v3
6.5
EG Score
9.0(high)
EPSS
79.8%
KEV
⚠ Exploited

Published

August 7, 2017

Last Modified

April 22, 2026

Advisory Details (4)

Auto-updated May 20, 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-2017-6663
generic

Cisco IOS and IOS XE Software Autonomic Networking Infrastructure Denial of Service Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170726-anidos
generic
http://www.securitytracker.com/id/1038999
generic
http://www.securityfocus.com/bid/99973

Data Freshness Timeline

(refreshed 96× in last 7d / 412× 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 560 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2017-6663?
CVE-2017-6663 is a medium vulnerability published on August 7, 2017. A vulnerability in the Autonomic Networking feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, adjacent attacker to cause autonomic nodes of an affected system to reload, resulting in a denial of service (DoS) condition. More Information: CSCvd88936. Known…
When was CVE-2017-6663 disclosed?
CVE-2017-6663 was first published in the National Vulnerability Database on August 7, 2017, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-6663 actively exploited?
Yes. CISA added CVE-2017-6663 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Cisco IOS and IOS XE Software. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2017-6663?
CVE-2017-6663 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2017-6663?
CVE-2017-6663 affects Cisco IOS and IOS XE Software. 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-2017-6663?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-6663, 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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