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CVE-2012-0381

Cisco IOS - IKEv1 Implementation

Cisco CVSS 7.5 Updated April 30, 2026

Executive Risk Summary

"A denial of service vulnerability exists in the IKEv1 implementation of Cisco IOS, allowing remote attackers to cause a device reload by sending IKE UDP packets over IPv4 or IPv6. This vulnerability affects Cisco IOS versions 12.2 through 12.4 and 15.0 through 15.2, as well as IOS XE versions 2.1.x through 2.6.x and 3.1.xS through 3.4.xS."

Anticipated Attack Path

  1. 1. Attacker sends IKE UDP packets over IPv4 or IPv6
  2. 2. IKEv1 implementation processes the packets, causing a device reload
  3. 3. Device becomes unavailable, resulting in a denial of service

Am I Vulnerable?

  • Verify Cisco IOS version and patch level
  • Check for IKEv1 implementation vulnerabilities
  • Implement IKEv2 or other secure protocols

Operational Audit Arsenal

Target Type Network Device
Target Asset IKEv1 Process
Standard Path Cisco IOS

Manual Verification Required

This is a non-Windows asset (Cisco). Use the target asset details and official path provided above to verify your current version against the official vendor advisories listed below.

Patch Impact Forecast

Reboot Required Likely

Network connectivity may be disrupted during the patching process

Internal Work Notes

Denial of service vulnerability in Cisco IOS IKEv1 implementation, requiring patching to prevent device reloads

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Intelligence Sources

Related Cisco Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.