CVE-2018-0154VulnerabilityPublished 03/03/2022Updated 10/24/2026

CVE-2018-0154: Cisco IOS Software Integrated Services Module for VPN Denial-of-Service Vulnerability

Affects Cisco IOS SoftwareSource CISA KEV

Severity

High

No CVSS score published yet

Exploitation: Actively exploited – in CISA KEV since 03/03/2022
KEV deadline: 03/17/2022
EPSS: 7.1% chance of exploitation in 30 days – higher than 94% of CVEs

What to do

CISA required action

Apply updates per vendor instructions.

nvd.nist.gov/vuln/detail/CVE-2018-0154 (opens in a new tab)

Description

CVE-2018-0154 is a high-severity vulnerability in the crypto engine of Cisco Integrated Services Module for VPN (ISM-VPN) running Cisco IOS Software. It allows an unauthenticated remote attacker to cause a denial-of-service (DoS) condition. This vulnerability has been exploited in the wild. No specific affected versions or patch information is provided in the available data.

Summary

This vulnerability affects the crypto engine component of Cisco ISM-VPN modules running Cisco IOS Software. An unauthenticated remote attacker can exploit this flaw to trigger a denial-of-service condition, disrupting VPN services. The vulnerability is tracked as CVE-2018-0154 and has been observed in active exploitation scenarios. No detailed version or patch information is included in the provided data.

Impact

Successful exploitation results in a denial-of-service condition, potentially disrupting VPN connectivity and impacting network availability. The vulnerability is exploitable remotely without authentication, increasing the risk of widespread impact. It has been confirmed to be exploited in the wild, indicating active threat presence.

Mitigation

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, monitor Cisco advisories for updates and apply any recommended temporary mitigations. Cisco IOS Software users with ISM-VPN modules should prioritize verifying their exposure and readiness to apply patches once released.

Weaknesses

CWE-399Unclassified weakness (opens in a new tab)

What to do

Description

AnalysisAI-generated, updated 10/24/2026, 10:40:38 UTC

Weaknesses

References

Related threats