Exploited vulnerability · CISA KEV

Is CVE-2018-0158 exploited? Yes: in CISA KEV since 3 Mar 2022

Gociux · Cisco IOS Software and Cisco IOS XE Software · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2018-0158, Cisco IOS and XE Software Internet Key Exchange Memory Leak Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Mar 2022, 1436 days after it was published. It affects Cisco IOS Software and Cisco IOS XE Software, an internet-facing product of the kind attackers use for initial access. If you run it, CISA's required action is: Apply updates per vendor instructions.

What it is

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.

What to do

1. Check whether you run it. Look for IOS Software and Cisco IOS XE Software in your asset inventory, including appliances and cloud images. Stack check lists every exploited Cisco CVE at once.
2. Apply the fix. Apply updates per vendor instructions.
3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 28 Mar 2018.
4. Get told next time. Email alerts when CISA adds a CVE for Cisco.

Other exploited CVEs in IOS Software and Cisco IOS XE Software

• CVE-2018-0159: Cisco IOS and XE Software Internet Key Exchange Version 1 Denial-of-Service Vulnerability (3 Mar 2022)
• CVE-2018-0156: Cisco IOS Software and Cisco IOS XE Software Smart Install Denial-of-Service Vulnerability (3 Mar 2022)

References

• nvd.nist.gov/vuln/detail/CVE-2018-0158

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in March 2022 · Cisco scorecard · act-now radar.