Secuno
ENNL
Book demo

CVE-2017-6627

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

7.5 HIGHActively exploited (CISA KEV)EPSS 6.16%
  1. Published7 Sept 2017
  2. Added to CISA KEV3 Mar 2022
  3. Remediation due24 Mar 2022
Actively exploited (CISA KEV)

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.

Added to KEV: 3 Mar 2022Federal remediation due: 24 Mar 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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Cisco iOS15.1\(2\)gc · 15.1\(2\)gc1 · 15.1\(2\)gc2 · 15.1\(4\)gc
Cisco iOS XE3.14.0s · 3.14.1s · 3.14.2s · 3.14.3s

Remediation

No fixed version is recorded in the NVD data. Check the vendor advisory for the latest guidance.

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-418699.1
Missing Authorization, Improper Resource Shutdown and Job Interruption vulnerability in…
CVE-2025-58678.0
A vulnerability classified as critical was found in RT-Thread 5.1.0. This vulnerability…
CVE-2022-257628.6
If a web application sends a WebSocket message concurrently with the WebSocket…
CVE-2022-207678.6
A vulnerability in the Snort rule evaluation function of Cisco Firepower Threat Defense…
CVE-2022-207158.6
A vulnerability in the remote access SSL VPN features of Cisco Adaptive Security…
CVE-2019-152568.6
A vulnerability in the Internet Key Exchange version 1 (IKEv1) feature of Cisco…

Frequently asked

Is CVE-2017-6627 being actively exploited?

Yes. CVE-2017-6627 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Mar 2022.

How severe is CVE-2017-6627?

CVE-2017-6627 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 6.16% probability of exploitation.

Which products are affected by CVE-2017-6627?

Affected products include Cisco iOS, Cisco iOS XE.

How do I fix CVE-2017-6627?

Apply the vendor's patch or advisory guidance, then verify no affected versions remain across your devices.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2017-6627 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.