PatchSiren

PatchSiren cyber security CVE debrief

CVE-2018-0156 Cisco CVE debrief

CVE-2018-0156 is a Cisco IOS Software and Cisco IOS XE Software Smart Install denial-of-service vulnerability. CISA has included it in the Known Exploited Vulnerabilities (KEV) catalog, which means defenders should treat it as actively important to address. The KEV entry directs organizations to apply updates per vendor instructions.

Vendor
Cisco
Product
IOS Software and Cisco IOS XE Software
CVSS
HIGH 8.6
CISA KEV
Listed
Original CVE published
2022-03-03
Original CVE updated
2022-03-03
Advisory published
2022-03-03
Advisory updated
2022-03-03

Who should care

Organizations running Cisco IOS Software or Cisco IOS XE Software, especially teams responsible for network infrastructure, perimeter devices, and environments where Smart Install may be in use or reachable.

Technical summary

The public record identifies a Smart Install flaw in Cisco IOS Software and Cisco IOS XE Software that can be used to cause denial of service. The CISA KEV catalog lists the vulnerability as known exploited and points defenders to vendor-provided updates as the remediation path.

Defensive priority

Urgent. This CVE is on CISA’s KEV catalog, with a due date of 2022-03-17 in the supplied timeline, so remediation should be prioritized immediately for affected Cisco devices.

Recommended defensive actions

  • Apply Cisco updates per vendor instructions as directed by the CISA KEV entry.
  • Inventory Cisco IOS and IOS XE devices to determine whether they are affected by CVE-2018-0156.
  • Prioritize remediation for internet-facing and business-critical network devices.
  • Verify that the updated software is deployed successfully and document completion.
  • Monitor affected devices for service disruption or abnormal restart behavior while remediation is underway.

Evidence notes

The supplied corpus includes the CISA KEV entry for this CVE, which states the vulnerability name, lists Cisco IOS Software and Cisco IOS XE Software as the affected product family, and gives the required action: "Apply updates per vendor instructions." The corpus also supplies official CVE.org and NVD records as supporting reference links. No CVSS score was provided in the supplied data.

Sources and references

Verified primary and authoritative sources

  • CVE-2018-0156 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2018-0156

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2018-0156 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2018-0156

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.