Vulnerability in Cisco iOS Xr

CVE-2015-4195

Cisco IOS XR 5.1.1.K9SEC allows remote authenticated users to cause a denial of service (vty error, and SSH and TELNET outage) via a crafted disconnect action within an SSH session, aka Bug ID CSCul63127.

Published 2015-06-19 · last modified 2026-06-17.

CVSS v2 metric

CVSS v2 base score 4.0 (Medium). Vector: AV:N/AC:L/Au:S/C:N/I:N/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.

EPSS exploit prediction

EPSS: 0.016 (75.1th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 75th percentile — 75.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: -0.000

Affected products

Cisco iOS Xr — versions 5.1.1.k9sec

Weakness classification (CWE)

CWE-399

References

www.securityfocus.com/bid/75295 (VDB Entry, Third Party Advisory, vdb-entry)
tools.cisco.com/security/center/viewAlert.x (vendor-advisory, Vendor Advisory)
www.securitytracker.com/id/1032661 (VDB Entry, Third Party Advisory, vdb-entry)