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CVE-2015-7744

18
FAUCET Score

CVE-2015-7744 describes a vulnerability in wolfSSL (formerly CyaSSL) versions prior to 3.6.8, affecting products like MariaDB and openSUSE. This flaw allows remote attackers to extract private RSA keys by exploiting improper handling of Chinese Remainder Theorem (CRT) faults during ephemeral key exchange without low memory optimizations, a technique known as a Lenstra attack. The vulnerability has a CVSS score of 5.9 (Medium), indicating a network-based attack with high complexity but high confidentiality impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.6.8CPE matchmatch criteria
cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*
42.1CPE matchmatch criteria
cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*
13.1CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.1:*:*:*:*:*:*:*
13.2CPE matchmatch criteria
cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*
>= 5.5.0, < 5.5.46CPE matchmatch criteria
cpe:2.3:a:mariadb:mariadb:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.9MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
5.03%
Probability of exploitation in next 30 days
EPSS Percentile
91.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0503 is in the 89th percentile among its peer group of 19,958 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, 0.0 Bluesky, 0.0 Mastodon, and 0.2 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)

oraclevendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

redhatCVE-2015-7744Low

wolfSSL: insufficient hardening of RSA-CRT implementation (Oracle MySQL CPU Jan 2016)

Jan 20, 2015

References

lists.opensuse.org / opensuse-security-announce/2016-02/msg00015.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2016-02/msg00016.html
Mailing ListThird Party Advisory
people.redhat.com / ~fweimer/rsa-crt-leaks.pdf
ExploitThird Party Advisory
securityblog.redhat.com / 2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy
ExploitThird Party Advisory
wolfssl.com / wolfSSL/Blog/Entries/2015/9/17_Two_Vulnerabilities_Recently_Found%2C_An_Attack_on_RSA_using_CRT_and_DoS_Vulnerability_With_DTLS.html
Vendor Advisory
wolfssl.com / wolfSSL/Docs-wolfssl-changelog.html
Release NotesVendor Advisory
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
Third Party Advisory
oracle.com / technetwork/topics/security/cpujan2016-2367955.html
Vendor Advisory
securitytracker.com / id/1034708
Broken LinkThird Party AdvisoryVDB Entry