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CVE-2024-20481 Cisco CVE debrief

CVE-2024-20481 is a Cisco ASA and Firepower Threat Defense denial-of-service vulnerability that CISA has added to its Known Exploited Vulnerabilities catalog. That KEV listing makes this a priority for defenders because it is treated as actively exploited. The supplied corpus does not include affected versions, attack preconditions, or a CVSS score, so remediation should follow Cisco’s official guidance as soon as possible.

Vendor
Cisco
Product
Adaptive Security Appliance (ASA) and Firepower Threat Defense (FTD)
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2024-10-24
Original CVE updated
2024-10-24
Advisory published
2024-10-24
Advisory updated
2024-10-24

Who should care

Security and network teams that operate Cisco Adaptive Security Appliance (ASA) or Firepower Threat Defense (FTD), especially if the devices are externally exposed or support critical perimeter functions.

Technical summary

The available source material identifies this issue as a denial-of-service vulnerability affecting Cisco ASA and FTD and confirms that it is tracked by CISA as a known exploited vulnerability. CISA’s KEV metadata directs organizations to apply vendor mitigations or discontinue use of the product if mitigations are unavailable. The provided corpus does not include exploit mechanics, affected release ranges, or a CVSS score.

Defensive priority

High. CISA added the vulnerability to the KEV catalog on 2024-10-24 with a remediation due date of 2024-11-14, which indicates urgent attention is warranted for exposed Cisco ASA/FTD deployments.

Recommended defensive actions

  • Identify all Cisco ASA and FTD assets in your environment, including internet-facing devices and appliances used for remote access or perimeter security.
  • Review the Cisco security advisory referenced in the KEV metadata and apply Cisco-provided mitigations immediately.
  • If Cisco does not provide a workable mitigation for a specific deployment, plan to discontinue use or replace the affected product as CISA recommends.
  • Validate logging, monitoring, and alerting for service degradation or denial-of-service symptoms on ASA/FTD devices.
  • Track remediation progress against the KEV due date of 2024-11-14 and escalate any unpatched exposed systems.

Evidence notes

This debrief is based on the supplied CISA KEV source item and the official links provided in the corpus. The KEV metadata identifies Cisco as the vendor, ASA and FTD as the product, the issue as a denial-of-service vulnerability, dateAdded as 2024-10-24, and dueDate as 2024-11-14. The corpus also includes official CVE.org and NVD links, but it does not provide a CVSS score or additional technical detail.

Official resources

Public timing context: CVE publishedAt and modifiedAt are 2024-10-24, and CISA KEV dateAdded is also 2024-10-24 with dueDate 2024-11-14. No separate severity rating was supplied in the source corpus.