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CVE-2016-6423

17
FAUCET Score

CVE-2016-6423 describes a denial-of-service vulnerability affecting Cisco IOS 15.5(3)M and IOS XE, specifically within their IKEv2 client and initiator implementations. A remote IKEv2 server can trigger a device reload by sending specially crafted IKEv2 packets. Rated Medium (CVSS 6.5), this vulnerability requires low privileges and network access, leading to high availability impact without affecting confidentiality or integrity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
15.5\(3\)mCPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.5\(3\)m:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.22%
Probability of exploitation in next 30 days
EPSS Percentile
65.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0122 is in the 79th percentile among its peer group of 21,954 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

tools.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-20161005-ios-ikev
Vendor Advisory
securityfocus.com / bid/93411
securitytracker.com / id/1036955