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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
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

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.

Official resources

Publicly disclosed vulnerability; CISA KEV listing indicates known exploitation. The supplied records are dated 2021-11-03, which should be treated as the publication/entry date in this debrief context.