CVE-2015-7744

medium

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.

References

Advisories
More

http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.html

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.html

https://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

https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/

https://people.redhat.com/~fweimer/rsa-crt-leaks.pdf

https://euvd.enisa.europa.eu/vulnerability/EUVD-2015-7644

http://www.securitytracker.com/id/1034708

http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html

http://wolfssl.com/wolfSSL/Docs-wolfssl-changelog.html

Details

Source: Mitre, NVD

Published: 2016-01-22

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 2.6

Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:N/A:N

Severity: Low

CVSS v3

Base Score: 5.9

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

Severity: Medium

EPSS

EPSS: 0.01566