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CVE-2017-6627

7.5
HIGHCVSS v3.1 Base Score
10.18%
LOW RiskEPSS (93rd percentile)
KEV

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.

Published: 9/7/2017
Modified: 4/22/2026
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

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

Vendor / Product:

Cisco IOS and IOS XE Software

Required Action:

Apply updates per vendor instructions.

Due Date: 3/24/2022(OVERDUE)
Added to KEV:

3/3/2022

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2017-6627

Vulnerability Summary

CVSS v3 Score

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2 Score

5

AV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS Score (Exploitation Probability)

10.18%LOW Exploitation Risk
93rd percentile

This vulnerability has a 10.18% probability of being exploited in the next 30 days, ranking higher than 93% of all scored CVEs.

CWE Classification

Related Vulnerabilities

Same Weakness Type(CWE-399)

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Similar SeverityHIGH