Reference page — cumulative record through Thursday, October 8, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2017-6627

CVE-2017-6627HIGH

n/a Cisco IOS and Cisco IOS XE — Cisco IOS and IOS XE Software

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  U  N  N  H    7.5   .0616   93.3   YES

AFFECTED
  Product                     Versions                      Fixed
  Cisco IOS and Cisco IOS XE  Cisco IOS and Cisco IOS XE –  —

TIMELINE
  Mar 9   Reserved by cisco
  Sep 7   Published (CNA: cisco)
  Mar 3   Added to CISA KEV, remediation due 2022-03-24

CWE-399 · CNA: cisco · CVSS v3.1 · 4 references · KEV due March 24, 2022

Description

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
March 9, 2017	Reserved	Reserved by cisco
September 7, 2017	Published	Published (CNA: cisco)
March 3, 2022	KEV ADDED	Added to CISA KEV, remediation due 2022-03-24

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	Cisco IOS and Cisco IOS XE	—	Cisco IOS and Cisco IOS XE	—

Weaknesses

CWE-399

References (4)

http://www.securityfocus.com/bid/100644 [vdb-entry, x_refsource_BID]
http://www.securitytracker.com/id/1039289 [vdb-entry, x_refsource_SECTRACK]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-ios-udp [x_refsource_CONFIRM]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-6627 [government-resource]

Authoritative record: CVE-2017-6627 at cve.org

Weaknesses: CWE-399

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2017-6627 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Thursday, October 8, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.