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PatchSiren cyber security CVE debrief

CVE-2018-0296 Cisco CVE debrief

CVE-2018-0296 is a denial-of-service vulnerability affecting Cisco Adaptive Security Appliance (ASA). CISA added it to the Known Exploited Vulnerabilities (KEV) catalog, which means it is considered known to be exploited in the wild. The supplied source set does not include exploit details or affected version ranges, so the safest response is to prioritize Cisco’s updates and remediation guidance.

Vendor
Cisco
Product
Adaptive Security Appliance (ASA)
CVSS
HIGH 7.5
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

Organizations running Cisco ASA appliances, especially security teams, network administrators, and incident response teams responsible for perimeter devices and VPN/security gateways.

Technical summary

The available corpus identifies the issue as a Cisco ASA denial-of-service vulnerability and confirms it appears in CISA’s KEV catalog. No further technical mechanics, affected versions, or attack preconditions are provided in the source set. From a defensive standpoint, treat any exposed or business-critical ASA deployment as high priority for vendor patching and validation against Cisco guidance.

Defensive priority

High. CISA’s KEV inclusion indicates confirmed exploitation, and the source item instructs organizations to apply updates per vendor instructions. If remediation has not already been completed, this should be treated as an urgent maintenance item for Cisco ASA environments.

Recommended defensive actions

  • Review Cisco’s official advisories and apply the vendor-recommended updates for affected ASA devices.
  • Inventory all Cisco ASA deployments, including internet-facing and remote-access perimeter devices.
  • Verify whether any ASA systems remain on vulnerable software and prioritize them for maintenance windows.
  • Monitor for service degradation or unexpected reloads that could indicate denial-of-service impact.
  • Document remediation status and ensure the configuration/patch baseline is maintained across all ASA instances.

Evidence notes

Evidence is limited to the supplied CISA KEV entry and the linked official references. The corpus confirms the vulnerability name, affected product family (Cisco ASA), KEV listing, date added (2021-11-03), due date (2022-05-03), and the required action to apply updates per vendor instructions. No exploit chain, version list, or remediation bulletin text was included in the supplied data.

Sources and references

Verified primary and authoritative sources

  • CVE-2018-0296 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2018-0296

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

  • CVE-2018-0296 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2018-0296

    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.