CVE-2013-6979 — 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

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MEDIUM

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

Published Dec 23, 2013

5.4

MEDIUM

CVSS 2.0

EPSS 3.60%

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.

Affected products

Remediation

No remediation recorded yet.

Metrics

3.60% 0.03602

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.03602

Score over time

2022–2026

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (10 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	3.60% (0.03602)	89.09th	v5 (v2026.06.15)
Jun 15, 2026	3.60% (0.03602)	87.94th	v5 (v2026.06.15)
Mar 17, 2025	0.44% (0.00441)	61.08th	v4 (v2025.03.14)
Dec 12, 2024	0.26% (0.00262)	66.41th	v3 (v2023.03.01)
Feb 8, 2024	0.26% (0.00262)	64.93th	v3 (v2023.03.01)
Mar 7, 2023	0.27% (0.00265)	62.34th	v3 (v2023.03.01)
Mar 6, 2023	1.21% (0.01213)	66.61th	v2 (v2022.01.01)
Feb 17, 2023	1.21% (0.01213)	66.22th	v2 (v2022.01.01)
Apr 1, 2022	1.21% (0.01213)	64.21th	v2 (v2022.01.01)
Feb 4, 2022	1.21% (0.01213)	40.54th	v2 (v2022.01.01)

Weaknesses (1)

CWE-287

Improper Authentication

References (5)

http://osvdb.org/101351
vdb-entryx_refsource_OSVDB
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6979
vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/64502
vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1029537
vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/89901
vdb-entryx_refsource_XF

Link	Providers	Tags
http://osvdb.org/101351		vdb-entryx_refsource_OSVDB
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2013-6979		vendor-advisoryx_refsource_CISCOVendor Advisory
http://www.securityfocus.com/bid/64502		vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
http://www.securitytracker.com/id/1029537		vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
https://exchange.xforce.ibmcloud.com/vulnerabilities/89901		vdb-entryx_refsource_XF

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Dec 23, 2013

Updated Aug 6, 2024

Reserved Dec 5, 2013

Link CVE-2013-6979

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2013-6979

Red Hat

Severity n/a

Public date n/a

Links CVE-2013-6979