Vulnerability in Cisco iOS

CVE-2014-2143

The IKE implementation in Cisco IOS 15.4(1)T and earlier and IOS XE allows remote attackers to cause a denial of service (security-association drop) via crafted Main Mode packets, aka Bug ID CSCun31021.

Published 2014-04-04 · last modified 2026-06-17.

CVSS v2 metric

CVSS v2 base score 5.0 (Medium). Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.017 (76.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000

Affected products

Cisco iOS — versions 15.3(3)m2, 15.0, 15.3(3)m1
Cisco iOS Xe

References

tools.cisco.com/security/center/viewAlert.x (Vendor Advisory)
tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2014-2143 (vendor-advisory, Vendor Advisory)