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Findings

CVE-2017-6627

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

Published Sep 7, 2017 · updated Jun 16, 2026 · cisco ios

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.

Timeline

Detection, updates, and resolution for this record.

  1. Sep 7, 2017 · Catalog

    Detected

    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

  2. Mar 3, 2022 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. Mar 24, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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

Required action

Apply updates per vendor instructions.

CISA due date Mar 24, 2022

Affected

  • cpe cisco/ios15.1\(2\)gc
  • cpe cisco/ios15.1\(2\)gc1
  • cpe cisco/ios15.1\(2\)gc2
  • cpe cisco/ios15.1\(4\)gc
  • cpe cisco/ios15.1\(4\)gc1
  • cpe cisco/ios15.1\(4\)gc2
  • cpe cisco/ios15.2\(1\)gc
  • cpe cisco/ios15.2\(1\)gc1
  • vendor Cisco IOS and IOS XE Softwareversion unspecified

Sources

  • CISA KEVCVE-2017-6627

    A vulnerability in the UDP processing code of Cisco IOS and IOS XE 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 denial of service.

    cisa.gov
  • CVE.orgCVE-2017-6627

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2017-6627

    30-day exploitation probability 6.2%

    first.org
  • NIST NVDCVE-2017-6627

    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 (

    nvd.nist.gov

References