How to check if you are exposed to CVE-2018-0167
- Find every Cisco IOS, XR, and XE Software system you or your clients run, including ones exposed to the internet. Those come first: CISA only lists flaws attackers are already using.
- Compare each version with the fixed versions in the vendor advisory. Where no fix exists yet, apply the vendor’s mitigation or take the system off the internet.
- Run a credentialed vulnerability scan to catch the systems you missed, then check that the next scan no longer reports CVE-2018-0167.
US federal agencies had to fix this by 2022-03-17. Everyone else should treat that deadline as a guide: if it has passed, this is overdue.
Affected versions
Versions the National Vulnerability Database lists as vulnerable to CVE-2018-0167. Check the vendor advisory for the exact fixed builds before you sign anything off.
| Product | Vulnerable versions |
|---|---|
| Cisco IOS | 5.2.0.base; up to and including 15.6.3m1; up to and including 15.2\(6\)e0a; up to and including 15.2\(4a\)ea5 |
| Cisco IOS XR | from 4.1 before 5.1.3 |
| Cisco IOS XE | 5.2.0.base; up to and including 15.6.3m1; up to and including 15.2\(6\)e0a; up to and including 15.2\(4a\)ea5 |
Timeline
- · Published in the National Vulnerability Database
- · Added to CISA's Known Exploited Vulnerabilities catalog, 1,436 days after it was published
- · Fix-by date for US federal agencies, passed 1,690 days ago
Weakness type
More exploited Cisco vulnerabilities
CISA lists 102 exploited Cisco vulnerabilities. The closest matches:
- CVE-2018-0175Cisco IOS, XR, and XE Software Buffer Overflow VulnerabilityAdded 2022-03-03
- CVE-2026-76418Cisco Secure Firewall ASA Software and Cisco Secure FTD Software Unchecked Return Value to NULL Pointer Dereference VulnerabilityAdded 2026-10-29
- CVE-2026-76519Cisco Secure Email Gateway Relative Path Traversal VulnerabilityAdded 2026-10-14
- CVE-2026-76504Cisco Catalyst SD-WAN Manager Hex Encoding VulnerabilityAdded 2026-09-30
- CVE-2026-76460Cisco Identity Services Engine Incorrect Use of Privileged APIs VulnerabilityAdded 2026-09-16
- CVE-2026-76461Cisco Secure Email Gateway SQL Injection VulnerabilityAdded 2026-09-14
- CVE-2026-20079Cisco Firewall Management Center Authentication Bypass Using an Alternate Path or Channel VulnerabilityAdded 2026-09-09
- CVE-2026-20349Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection VulnerabilityAdded 2026-08-11
Keep going
Sources: CISA Known Exploited Vulnerabilities catalog (version 2026.10.30); EPSS data from FIRST.org; CVSS and descriptions from the NIST National Vulnerability Database. Checked 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.