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CVE-2016-6474

25
FAUCET Score

CVE-2016-6474 describes a vulnerability in Cisco IOS and IOS XE Software, specifically within the X.509 Version 3 implementation for SSH authentication. This flaw could allow an unauthenticated, remote attacker to bypass authentication on affected systems. With a CVSS v3 score of 7.3 (High), the vulnerability is easily exploitable over the network with low attack complexity, potentially leading to limited confidentiality, integrity, and availability impacts. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
15.5\(2.25\)tCPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.5\(2.25\)t:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.3HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
3.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.41%
Probability of exploitation in next 30 days
EPSS Percentile
69.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0141 is in the 51st percentile among its peer group of 51,485 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscoworkaround availablevia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20161207-ios-xe-x509
MitigationVendor Advisory
securityfocus.com / bid/94773
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037420
Third Party AdvisoryVDB Entry