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CVE-2018-0158

Cisco IOS and XE Software Internet Key Exchange Memory Leak

8.6 HIGHActively exploited (CISA KEV)EPSS 7.19%
  1. Published28 Mar 2018
  2. Added to CISA KEV3 Mar 2022
  3. Remediation due17 Mar 2022
Actively exploited (CISA KEV)

A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial-of-service (DoS) condition.

Added to KEV: 3 Mar 2022Federal remediation due: 17 Mar 2022

Description

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 condition. Cisco Bug IDs: CSCvf22394.

CVSS 3.1 breakdown

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

Affected products

Cisco iOS15.5\(3\)s1.1 · 15.5\(3\)s1.10 · 15.5\(3\)s1.11 · 15.5\(3\)s1.12
Cisco iOS XE15.5\(3\)s1.1 · 15.5\(3\)s1.10 · 15.5\(3\)s1.11 · 15.5\(3\)s1.12

Remediation

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

References

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Frequently asked

Is CVE-2018-0158 being actively exploited?

Yes. CVE-2018-0158 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Mar 2022.

How severe is CVE-2018-0158?

CVE-2018-0158 has a CVSS 3.1 base score of 8.6, rated high. EPSS estimates a 7.19% probability of exploitation.

Which products are affected by CVE-2018-0158?

Affected products include Cisco iOS, Cisco iOS XE.

How do I fix CVE-2018-0158?

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-2018-0158 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.

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