PatchSiren

PatchSiren cyber security CVE debrief

CVE-2004-1464 Cisco CVE debrief

CVE-2004-1464 is a Cisco IOS denial-of-service vulnerability that appears in CISA’s Known Exploited Vulnerabilities catalog. That KEV listing means defenders should treat it as a real-world risk, even though the supplied record set does not include deeper technical detail or a CVSS score. The safest response is to follow Cisco’s update guidance, verify whether any IOS systems are exposed, and prioritize remediation based on operational criticality.

Vendor
Cisco
Product
IOS
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2023-05-19
Original CVE updated
2023-05-19
Advisory published
2023-05-19
Advisory updated
2023-05-19

Who should care

Cisco IOS administrators, network engineering teams, vulnerability management owners, SOC analysts, and incident response teams should care, especially if IOS devices are internet-reachable or support business-critical routing and switching.

Technical summary

The supplied sources identify the issue only at a high level: a Cisco IOS denial-of-service vulnerability. CISA’s KEV entry indicates it is a known exploited vulnerability and directs organizations to apply updates per vendor instructions. The corpus provided here does not include the original Cisco advisory text, affected versions, attack preconditions, or a CVSS score, so those details should be verified in the vendor and NVD records before making implementation decisions.

Defensive priority

High priority. KEV inclusion is a strong signal to expedite patching or other vendor-recommended mitigation, especially for exposed or mission-critical IOS devices.

Recommended defensive actions

  • Review Cisco’s vendor guidance for the IOS advisory referenced in the CISA KEV notes and apply the recommended updates.
  • Inventory all Cisco IOS assets and identify which systems are reachable from untrusted networks.
  • Prioritize remediation for externally exposed, customer-facing, or business-critical network devices.
  • Confirm whether any compensating controls are in place until updates can be deployed.
  • Monitor logs and alerts for instability, unexpected reboots, or denial-of-service indicators on IOS devices.
  • Track remediation status in vulnerability management workflows and validate closure after update deployment.

Evidence notes

Evidence is limited to the supplied official records: the CVE entry, NVD detail page, and CISA KEV catalog. CISA’s source metadata names Cisco IOS as the affected product, labels the vulnerability as a denial-of-service issue, and marks it as a known exploited vulnerability with the instruction to apply updates per vendor instructions. No additional technical claims are made here beyond those records.

Official resources

This debrief is based only on the supplied official records. The provided timeline shows the CVE and KEV metadata published/modified on 2023-05-19 in the corpus, but that date should not be treated as the original vulnerability creation or