CVE-2017-6627

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

In the wild

CISA lists this as exploited in real attacks. Treat as urgent.

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2017-03-09 00:00 UTC ReservedThe CVE id was reserved by its CNA
2. 2017-09-07 21:29 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2022-03-03 Exploited in the wildAdded to CISA's Known Exploited Vulnerabilities list
4. 2022-03-24 Remediation deadlineCISA's due date for federal agencies to fix it
5. 2026-06-17 01:22 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: yes, CISA lists it. This puts it above everything that is not.
• Exploit odds: 6.2% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: a patch or advisory is linked.

Details

Published

2017-09-07 21:29 UTC

Last modified

2026-06-17 01:22 UTC

Added to CISA KEV

2022-03-03

Exploit probability

6.2% · EPSS, next 30 days

Weakness

CWE-399

Record status

Analyzed

Affected

• Cisco iOS 15.1\(2\)gc
• Cisco iOS 15.1\(2\)gc1
• Cisco iOS 15.1\(2\)gc2
• Cisco iOS 15.1\(4\)gc
• Cisco iOS 15.1\(4\)gc1
• Cisco iOS 15.1\(4\)gc2
• Cisco iOS 15.2\(1\)gc
• Cisco iOS 15.2\(1\)gc1

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

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