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CVE-2015-6429

15
FAUCET Score

CVE-2015-6429 describes a denial-of-service vulnerability in the IKEv1 state machine of Cisco IOS and IOS XE. A remote attacker can terminate IPsec connections by sending a specially crafted IKEv1 packet to a tunnel endpoint. This vulnerability has a CVSS score of 5.0, indicating a medium severity, with low attack complexity and no authentication required, leading to potential availability impact. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
15.4\(3\)sCPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.4\(3\)s:*:*:*:*:*:*:*
15.5\(1\)sCPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.5\(1\)s:*:*:*:*:*:*:*
15.5\(1\)tCPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.5\(1\)t:*:*:*:*:*:*:*
15.5\(2\)sCPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.5\(2\)s:*:*:*:*:*:*:*
15.5\(2\)tCPE matchmatch criteria
cpe:2.3:o:cisco:ios:15.5\(2\)t:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
1.74%
Probability of exploitation in next 30 days
EPSS Percentile
75.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0174 is in the 61st percentile among its peer group of 23,723 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 0.4 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-20151218-ios
Vendor Advisory
securitytracker.com / id/1034505