CVE-2013-6979

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Summary

CVECVE-2013-6979
StatePUBLISHED
Assignercisco
Source PriorityCVE Program / NVD first with legacy fallback
Published2013-12-23 22:55:03 UTC
Updated2026-04-29 01:13:23 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v2.0 5.4 from [email protected]

AV:N/AC:H/Au:N/C:C/I:N/A:N

EPSS: 0.036020000 probability, percentile 0.882030000 (date 2026-07-21)

Problem Types: CWE-287 | n/a

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
High
Authentication
None
Confidentiality
Complete
Integrity
None
Availability
None

AV:N/AC:H/Au:N/C:C/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Cisco Ios Xe - All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
IBM X-Force Exchange af854a3a-2127-422b-91ae-364da2661108 exchange.xforce.ibmcloud.com
Cisco Security Notice: Cisco IOS XE Software Telnet Authentication Bypass Vulnerability af854a3a-2127-422b-91ae-364da2661108 tools.cisco.com Vendor Advisory
Cisco IOS vty Authentication Flaw Lets Remote Users Access the System - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com Third Party Advisory, VDB Entry
Cisco IOS XE Software Telnet Remote Authentication Bypass Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
osvdb.org/101351 af854a3a-2127-422b-91ae-364da2661108 osvdb.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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