CVE-2015-0607 — The Authentication Proxy feature in Cisco IOS does not properly handle invalid AAA return codes from RADIUS and TACACS+ servers, which allows remote attackers to bypass authentication in opportunistic circumstances via a connection attempt that triggers an invalid code, as demonstrated by a connection attempt with a blank password, aka Bug IDs CSCuo09400 and CSCun16016

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MEDIUM

The Authentication Proxy feature in Cisco IOS does not properly handle invalid AAA return codes from RADIUS and TACACS+ servers, which allows remote attackers to bypass authentication in opportunistic circumstances via a connection attempt that triggers an invalid code, as demonstrated by a connection attempt with a blank password, aka Bug IDs CSCuo09400 and CSCun16016

Published Mar 6, 2015

4.3

MEDIUM

CVSS 2.0

EPSS 1.97%

Description

The Authentication Proxy feature in Cisco IOS does not properly handle invalid AAA return codes from RADIUS and TACACS+ servers, which allows remote attackers to bypass authentication in opportunistic circumstances via a connection attempt that triggers an invalid code, as demonstrated by a connection attempt with a blank password, aka Bug IDs CSCuo09400 and CSCun16016.

Remediation

No remediation recorded yet.

Metrics

1.97% 0.01969

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.01969

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 2, 2026	1.97% (0.01969)	79.69th	v5 (v2026.06.15)
Jun 15, 2026	1.98% (0.01983)	77.90th	v5 (v2026.06.15)
Mar 17, 2025	0.30% (0.00301)	51.28th	v4 (v2025.03.14)
Dec 12, 2024	0.37% (0.00368)	73.41th	v3 (v2023.03.01)
Feb 8, 2024	0.37% (0.00368)	71.77th	v3 (v2023.03.01)
Mar 7, 2023	0.37% (0.00368)	68.21th	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 (4)

http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0607
vendor-advisoryx_refsource_CISCOVendor Advisory
http://tools.cisco.com/security/center/viewAlert.x?alertId=37711
x_refsource_CONFIRMVendor Advisory
http://www.securityfocus.com/bid/72794
vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1031817
vdb-entryx_refsource_SECTRACK

Link	Providers	Tags
http://tools.cisco.com/security/center/content/CiscoSecurityNotice/CVE-2015-0607		vendor-advisoryx_refsource_CISCOVendor Advisory
http://tools.cisco.com/security/center/viewAlert.x?alertId=37711		x_refsource_CONFIRMVendor Advisory
http://www.securityfocus.com/bid/72794		vdb-entryx_refsource_BID
http://www.securitytracker.com/id/1031817		vdb-entryx_refsource_SECTRACK

Change history (0)

No recorded changes yet.

Sources

CVE.org / MITRE

Status PUBLISHED

Assigner cisco

Published Mar 6, 2015

Updated Aug 6, 2024

Reserved Jan 7, 2015

Link CVE-2015-0607

CISA Vulnrichment

Updated n/a

NVD

Status Modified

Modified Jun 17, 2026

Link CVE-2015-0607

Red Hat

Severity n/a

Public date n/a

Links CVE-2015-0607