Vulnerability in Cisco iOS

CVE-2015-6294

Cisco IOS 15.2(3)E and earlier and IOS XE 3.6(2)E and earlier allow remote attackers to cause a denial of service (functionality loss) via crafted Cisco Discovery Protocol (CDP) packets, aka Bug ID CSCuu25770.

Published 2015-09-18 · last modified 2026-06-17.

CVSS v2 metric

CVSS v2 base score 6.1 (Medium). Vector: AV:A/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: 0.008 (54.0th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 54.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Cisco iOS — versions 15.2\(3\)e, 15.2(3)e, 15.2\(2\)e2
Cisco iOS Xe — versions 3.6e.0, 3.6e.1, 3.6e.2

Weakness classification (CWE)

CWE-399

References

tools.cisco.com/security/center/viewAlert.x (vendor-advisory, Vendor Advisory)
www.securitytracker.com/id/1033612 (VDB Entry, Third Party Advisory, vdb-entry)