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CVE-2015-5738

21
FAUCET Score

CVE-2015-5738 describes a critical vulnerability in the RSA-CRT implementation within the Cavium SDK 2.x, specifically impacting OCTEON II CN6xxx Hardware running Linux with TLS and Perfect Forward Secrecy (PFS). This flaw allows remote attackers to extract private RSA keys through a Lenstra side-channel attack, affecting various F5 and Marvell products utilizing the vulnerable SDK. With a CVSS score of 7.5 (High), the vulnerability is network-exploitable with low attack complexity, potentially leading to complete compromise of confidentiality. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the vulnerability has garnered some community discussion, indicating awareness of its potential impact.

Impacted Technologies

VendorProductVersion(s)CPE
2.0CPE matchmatch criteria
cpe:2.3:a:marvell:software_development_kit:2.0:*:*:*:*:*:*:*
>= 3.3.2, <= 3.5.1CPE matchmatch criteria
cpe:2.3:a:f5:traffix_signaling_delivery_controller:*:*:*:*:*:*:*:*
>= 4.0.0, <= 4.4.0CPE matchmatch criteria
cpe:2.3:a:f5:traffix_signaling_delivery_controller:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.43%
Probability of exploitation in next 30 days
EPSS Percentile
82.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0243 is in the 69th 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

Patch Available

Vendor Patches (4)

microsoftpatch availablevia msrc
Product: cm1 kernel 5.10.57.1-1 on CBL Mariner 1.0Fixed in: -
microsoftpatch availablevia msrc
Product: 16840-16820Fixed in: -
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 x64Fixed in: 5.10.57.1-1
microsoftpatch availablevia msrc
Product: CBL Mariner 1.0 ARMFixed in: 5.10.57.1-1

Vendor Advisories (2)

microsoft2020-Sep/CVE-2015-5738

CVE-2015-5738

Sep 8, 2020
microsoft2016-Jul/CVE-2015-5738Important

The RSA-CRT implementation in the Cavium Software Development Kit (SDK) 2.x when used on OCTEON II CN6xxx Hardware on Linux to support TLS with Perfect Forward Secrecy (PFS) makes it easier for remote attackers to obtain private RSA keys by conducting a Lenstra side-channel attack.

Jul 12, 2016

References

fortiguard.com / advisory/rsa-crt-key-leak-under-certain-conditions
Broken Link
people.redhat.com / ~fweimer/rsa-crt-leaks.pdf
Technical DescriptionThird Party Advisory
support.f5.com / kb/en-us/solutions/public/k/91/sol91245485.html
Third Party Advisory