What is CVE-2015-6431?

CVE-2015-6431 is a medium-severity vulnerability in Cisco iOS Xe, classified under CWE-399. CVSS score: 6.5/10. Published 2015-12-23.

How severe is CVE-2015-6431?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Cisco iOS Xe

CVE-2015-6431

Cisco IOS XE 16.1.1 allows remote attackers to cause a denial of service (device reload) via a packet with the 00-00-00-00-00-00 source MAC address, aka Bug ID CSCux48405.

Published 2015-12-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.9th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 53rd percentile — 52.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Cisco iOS Xe — versions 16.1.1

Weakness classification (CWE)

CWE-399

References

www.securitytracker.com/id/1034514 (vdb-entry)
www.securityfocus.com/bid/79654 (vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-2015-122… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2015-6431?: CVE-2015-6431 is a medium-severity vulnerability in Cisco iOS Xe, classified under CWE-399. CVSS score: 6.5/10. Published 2015-12-23.
How severe is CVE-2015-6431?: Medium severity. CVSS v3 base score is 6.5 out of 10.