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PatchSiren cyber security CVE debrief

CVE-2018-0171 Cisco CVE debrief

CVE-2018-0171 is a Cisco IOS and IOS XE Smart Install remote code execution issue that CISA has placed in its Known Exploited Vulnerabilities catalog. That KEV inclusion means defenders should treat it as actively exploited risk and prioritize remediation on affected network devices. The supplied corpus directs operators to apply Cisco updates per vendor instructions.

Vendor
Cisco
Product
IOS and IOS XE
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Network and infrastructure teams that manage Cisco IOS or IOS XE devices, especially environments where the Smart Install feature is enabled or where management interfaces may be reachable from untrusted networks.

Technical summary

Based on the supplied official sources, the vulnerability affects Cisco IOS and IOS XE Software Smart Install and can result in remote code execution. CISA’s KEV record identifies the product as Cisco IOS and IOS XE, lists the issue as a known exploited vulnerability, and directs organizations to apply updates per vendor instructions.

Defensive priority

High. KEV inclusion indicates known exploitation, so this should be prioritized ahead of non-exploited routine maintenance when the affected devices are in scope.

Recommended defensive actions

  • Identify Cisco IOS and IOS XE assets in your environment and confirm whether they are in scope for CVE-2018-0171.
  • Apply Cisco-recommended updates per vendor instructions as soon as operationally feasible.
  • Review device exposure and restrict access to management-facing interfaces from untrusted networks.
  • Validate whether Smart Install is enabled on any affected devices and follow Cisco guidance for feature-specific mitigation and hardening.
  • Track remediation against the CISA KEV due date provided in the corpus and verify completion through configuration and version checks.

Evidence notes

The official sources supplied for this debrief are the CVE record, NVD detail page, and the CISA KEV catalog entry. The CISA KEV metadata in the corpus identifies the vulnerability as Cisco IOS and IOS XE Software Smart Install Remote Code Execution Vulnerability, sets dateAdded to 2021-11-03, dueDate to 2022-05-03, and requiredAction to apply updates per vendor instructions. The corpus does not provide a CVSS score, so severity here is based on KEV status and the vulnerability description rather than a numeric score.

Official resources

This debrief uses the supplied official-source corpus and the provided timeline fields for context. The CISA KEV entry in the corpus is dated 2021-11-03; that catalog date is not the same as the CVE’s original disclosure date.