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CVE-2015-5965

15
FAUCET Score

CVE-2015-5965 describes a vulnerability in the SSL-VPN feature of Fortinet FortiOS before version 4.3.13, where the system inadequately validates TLS MACs by only checking the first byte. This flaw allows remote attackers to potentially spoof encrypted content by manipulating the MAC field. With a CVSS score of 5.0, it represents a medium severity issue with low attack complexity, requiring no authentication, and primarily impacting integrity. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.3.12CPE matchmatch criteria
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

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

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

Exploit Intelligence

EPSS Score
2.09%
Probability of exploitation in next 30 days
EPSS Percentile
79.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0209 is in the 68th 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)

fortinetvendor investigatingvia nvd_reference
View patch

References

security.gentoo.org / glsa/201508-01
vivaldi.net / en-US/blogs/entry/the-poodle-has-friends
fortiguard.com / advisory/FG-IR-15-016
Vendor Advisory
securityfocus.com / bid/76065
securitytracker.com / id/1033256