Vulnerability in Cisco iOS Xr

CVE-2015-4223

Cisco IOS XR 5.1.3 allows remote attackers to cause a denial of service (process reload) via crafted MPLS Label Distribution Protocol (LDP) packets, aka Bug ID CSCuu77478.

Published 2015-06-25 · 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:P/A:N. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.025 (84.0th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Cisco iOS Xr — versions 5.1.3

Weakness classification (CWE)

CWE-399

References

www.securitytracker.com/id/1032715 (VDB Entry, Third Party Advisory, vdb-entry)
www.securityfocus.com/bid/75399 (VDB Entry, Third Party Advisory, vdb-entry)
tools.cisco.com/security/center/viewAlert.x (vendor-advisory, Vendor Advisory)