Vulnerability in Cisco iOS

CVE-2011-0944

Cisco IOS 12.4, 15.0, and 15.1 allows remote attackers to cause a denial of service (device reload) via malformed IPv6 packets, aka Bug ID CSCtj41194.

Published 2011-10-03 · last modified 2026-06-16.

CVSS v2 metric

CVSS v2 base score 7.8 (High). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.018 (77.5th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 78th percentile — 77.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Cisco iOS — versions 12.4, 15.0, 15.1

Weakness classification (CWE)

CWE-399

References

tools.cisco.com/security/center/viewAlert.x (Vendor Advisory)
www.cisco.com/en/US/products/products_security_advisory09186a0080b95d59.shtml (vendor-advisory, Vendor Advisory)