CVE-2017-6663

CRITICALNVD 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 — 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: 2.1%CVSS: 6.5Exploit: cisa kev · ssvc activeExposed services: Not assessed

A fix is available — apply it.

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
9.0CRITICALhigh confidence
EG Risk
81
EG Risk 81/100CISA SSVC

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%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
2.1%
EPSS %ILE
81st
KEV
⚠ Exploited

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation active (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 7, 2017

Last Modified

June 17, 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 53× in last 7d / 244× 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 1,053 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2017-6663?
CVE-2017-6663 is a critical 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 on August 7, 2017, with the most recent update on June 17, 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 attention. A fix is available. Apply it.
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 (CRITICAL).
Which products are affected by CVE-2017-6663?
CVE-2017-6663 affects Cisco IOS and IOS XE Software.
How do I remediate CVE-2017-6663?
A fix for CVE-2017-6663 is available: update to the fixed version the vendor names in its advisory.

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