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CISA KEV · Known exploitedHigh

CVE-2017-6627

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 atta...

CVSS
7.5
EPSS
6.04%
92.6% percentile
CISA KEV
Listed
Published
2017.09.08
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability6.04%
Technical severityCVSS 7.5

Vulnerability overview

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 atta...

Affected product and versions

Product
Cisco IOS and IOS XE Software
Affected versions
Cisco IOS and Cisco IOS XE, 15.1(2)gc, 15.1(2)gc1, 15.1(2)gc2, 15.1(4)gc, 15.1(4)gc1, 15.1(4)gc2, 15.2(1)gc, 15.2(1)gc1, 15.2(1)gc2, 15.2(2)gc, 15.2(3)gc, 15.2(3)gc1, 15.2(3r)gca, 15.2(4)gc, 15.2(4)gc1, 15.2(4)gc2, 15.2(4)gc3, 15.4(1)t, 15.4(1)t1
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply updates per vendor instructions.

Due date: 2022.03.24
  1. 1
    Identify

    Confirm that Cisco IOS and IOS XE Software and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-399, CWE-404
KEV added
2022.03.03
Ransomware use
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