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CISA KEV · Known exploitedHigh

CVE-2018-0158

Cisco IOS Software and Cisco IOS XE Software

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a memory leak or a reload of an affected device that leads to a denial of service (DoS) condition. The vulnerability is due to incorrect processing of certain IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device to be processed. A successful exploit could cause an affected device to continuously consume memory and eventually reload, resulting in a DoS condit...

CVSS
8.6
EPSS
7.24%
93.7% percentile
CISA KEV
Listed
Published
2018.03.29
PRIORITY ASSESSMENT

Immediate review

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

Known exploitationConfirmed by CISA KEV
Exploit probability7.24%
Technical severityCVSS 8.6

Vulnerability overview

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause a memory leak or a reload of an affected device that leads to a denial of service (DoS) condition. The vulnerability is due to incorrect processing of certain IKEv2 packets. An attacker could exploit this vulnerability by sending crafted IKEv2 packets to an affected device to be processed. A successful exploit could cause an affected device to continuously consume memory and eventually reload, resulting in a DoS condit...

Affected product and versions

Product
Cisco IOS Software and Cisco IOS XE Software
Affected versions
Cisco IOS and IOS XE, 15.5(3)s1.1, 15.5(3)s1.2, 15.5(3)s1.4, 15.5(3)s1.5, 15.5(3)s1.7, 15.5(3)s1.8, 15.5(3)s1.9, 15.5(3)s1.10, 15.5(3)s1.11, 15.5(3)s1.12
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: 2022.03.17
  1. 1
    Identify

    Confirm that Cisco IOS Software and Cisco 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:C/C:N/I:N/A:H
CWE
CWE-20, CWE-401
KEV added
2022.03.03
Ransomware use
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