← Vulnerability feed

Vulnerability record · CVE-2015-7744 · published 22 January 2016

CVE-2015-7744: Wolfssl vulnerability

Wolfssl · Wolfssl

wolfSSL (formerly CyaSSL) before 3.6.8 does not properly handle faults associated with the Chinese Remainder Theorem (CRT) process when allowing ephemeral key exchange without low memory optimizations on a server, which makes it easier for remote attackers to obtain private RSA keys by capturing TLS handshakes, aka a Lenstra attack.

5.9 CVSS 3.1 Medium EPSS 5.0% · top 8.0%
5.9CVSS 3.1 base score, v2 2.6
5.0%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
18References, 4 tagged exploit
17 Jun 2026Last modified by NVD

Description

wolfSSL (formerly CyaSSL) before 3.6.8 does not properly handle faults associated with the Chinese Remainder Theorem (CRT) process when allowing ephemeral key exchange without low memory optimizations on a server, which makes it easier for remote attackers to obtain private RSA keys by capturing TLS handshakes, aka a Lenstra attack.

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

Track CVE-2015-7744 inside VULONE

Watch it alongside the ransomware crews, C2 infrastructure and forum chatter that reference it, query it through the API and pull it into your SIEM over TAXII.

Start free Open in platform

Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2020-16846SaltStack Salt API shell injection via crafted web requestsSaltStack Salt through 3002 is vulnerable to OS command injection when the SSH client is enabled and crafted web requests are sent to the Salt API. T…KEVEPSS 100%analysed9.8CVE-2020-12641Roundcube Webmail OS command injection via image conversion path settingsRoundcube Webmail before 1.4.4 passes the im_convert_path and im_identify_path configuration settings to a shell without sanitization in rcube_image.…KEVEPSS 84%analysed9.8CVE-2020-11651SaltStack Salt master authentication bypass in ClearFuncsSaltStack Salt before 2019.2.4 and 3000 before 3000.2 fails to properly validate method calls in the salt-master ClearFuncs class, allowing remote un…KEVEPSS 97%analysed9.8CVE-2020-1938Apache Tomcat AJP connector file read and JSP execution flawApache Tomcat shipped an AJP Connector enabled by default that listened on all configured IP addresses, and Tomcat treats AJP connections as more tru…KEVEPSS 99%analysed9.8CVE-2016-4171Adobe Flash Player unspecified remote code execution flawCVE-2016-4171 is an unspecified vulnerability in Adobe Flash Player 21.0.0.242 and earlier that allows remote attackers to execute arbitrary code thr…KEVEPSS 20%analysed9.8CVE-2016-4117Adobe Flash Player unspecified vectors allow arbitrary code executionAdobe Flash Player 21.0.0.226 and earlier contains a critical flaw that lets remote attackers execute arbitrary code through unspecified vectors. Ado…KEVEPSS 94%analysed9.8CVE-2016-3427Oracle Java SE JMX Improper Access Control VulnerabilityCVE-2016-3427 is an unspecified vulnerability in Oracle Java SE 6u113, 7u99, 8u77, Java SE Embedded 8u77, and JRockit R28.3.9, reached through vector…KEVEPSS 92%analysed9.8CVE-2015-2590Oracle Java SE Libraries flaw allows remote code executionCVE-2015-2590 is an unspecified vulnerability in the Libraries component of Oracle Java SE 6u95, 7u80, 8u45 and Java SE Embedded 7u75, 8u33. The reco…KEVEPSS 25%analysed

Source: NIST National Vulnerability Database (record CVE-2015-7744), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.