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Vulnerabilities

Vulnerability · CVE-2017-6627

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

Published Sep 7, 2017 · catalog updated Jun 16, 2026 · Cisco IOS and IOS XE Software

Patch now

CVE-2017-6627 is in the CISA known-exploited catalog, due Mar 24, 2022. Confirm Cisco IOS and IOS XE Software against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
High7.5
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
6.16%
Remediation
Remediation guidance
Affected products
cpe cisco/ios · vendor Cisco IOS and IOS XE Software

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • 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

How to fix CVE-2017-6627

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2017-6627 is in the CISA known-exploited catalog, due Mar 24, 2022. Confirm Cisco IOS and IOS XE Software against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with 15.1\(2\)gc, 15.1\(2\)gc1, 15.1\(2\)gc2, 15.1\(4\)gc, 15.1\(4\)gc1, 15.1\(4\)gc2. Apply updates per vendor instructions.

What should an analyst verify?

CWE-399; CWE-404. EPSS 6.16%. The CISA KEV listing is the exploitation evidence. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Cisco security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

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

Sources

  • CISA KEVConfirmed exploitationCVE-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.orgVulnerability recordCVE-2017-6627

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2017-6627

    30-day exploitation probability 6.2%

    first.org
  • NIST NVDVulnerability recordCVE-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
  • VulnCheck KEVConfirmed exploitationCVE-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.

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.