CVE-2013-6979

Name: CVE-2013-6979
Creator: NVD / NIST
Published: 2013-12-23T22:55:03.177+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.60%

Last modified Jun 17, 2026

CVE-2013-6979 is a vulnerability of currently unknown severity. The VTY authentication implementation in Cisco IOS XE 03.02.xxSE and 03.03.xxSE incorrectly relies on the Linux-IOS internal-network configuration, which allows remote attackers to bypass authentication by leveraging access to a 192.168.x.2 source IP address, aka Bug ID CSCuj90227.. EPSS estimates a 3.60% chance of exploitation in the next 30 days.

Description

The VTY authentication implementation in Cisco IOS XE 03.02.xxSE and 03.03.xxSE incorrectly relies on the Linux-IOS internal-network configuration, which allows remote attackers to bypass authentication by leveraging access to a 192.168.x.2 source IP address, aka Bug ID CSCuj90227.

Metrics

EPSS Probability

3.60%

88.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-287

Affected Software

Vendor	Product	Versions
Cisco	Ios Xe	All versions

References

http://osvdb.org/101351
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6979Vendor Advisory
http://www.securityfocus.com/bid/64502Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1029537Third Party Advisory, VDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/89901
http://osvdb.org/101351
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6979Vendor Advisory
http://www.securityfocus.com/bid/64502Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1029537Third Party Advisory, VDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/89901

Timeline

Published: Dec 23, 2013
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2013-6979?

How severe is CVE-2013-6979?

Severity scoring for CVE-2013-6979 is pending analysis. The EPSS model estimates a 3.60% probability of exploitation in the next 30 days.

How do I fix CVE-2013-6979?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2013-6979?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST