CVE-2017-6627

HIGHNVD 7.59.0▲
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 7.5 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
7.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 6%CVSS: 7.5Exploit: NoneExposed: 0

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

A vulnerability in the UDP processing code of Cisco IOS 15.1, 15.2, and 15.4 and IOS XE 3.14 through 3.18 could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and a denial of service (DoS) condition. The vulnerability is due to Cisco IOS Software application changes that create UDP sockets and leave the sockets idle without closing them. An attacker could exploit this vulnerability by sending UDP packets with a destination port of 0 to an affected device. A successful exploit could allow the attacker to cause UDP packets to be held in the input interfaces queue, resulting in a DoS condition. The input interface queue will stop holding UDP packets when it receives 250 packets. Cisco Bug IDs: CSCup10024, CSCva55744, CSCva95506.

CVSS v3
7.5
EG Score
9.0(high)
EPSS
92.6%
KEV
⚠ Exploited

Published

September 7, 2017

Last Modified

April 22, 2026

Advisory Details (4)

Auto-updated May 19, 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-2017-6627
generic🔴 Active Exploitation

Cisco IOS and Cisco IOS XE Software UDP Packet Processing Denial of Service Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-ios-udp
generic
http://www.securitytracker.com/id/1039289
generic
http://www.securityfocus.com/bid/100644

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 63× in last 7d / 246× 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 462 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2017-6627?
CVE-2017-6627 is a high vulnerability published on September 7, 2017. A vulnerability in the UDP processing code of Cisco IOS 15.1, 15.2, and 15.4 and IOS XE 3.14 through 3.18 could allow an unauthenticated, remote attacker to cause the input queue of an affected system to hold UDP packets, causing an interface queue wedge and a denial of service (DoS) condition. The…
When was CVE-2017-6627 disclosed?
CVE-2017-6627 was first published in the National Vulnerability Database on September 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-2017-6627 actively exploited?
Yes. CISA added CVE-2017-6627 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-2017-6627?
CVE-2017-6627 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2017-6627?
CVE-2017-6627 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-2017-6627?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-6627, 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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