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CVE-2015-7744

wolfSSL (formerly CyaSSL) before 3.6.8 does not properly handle faults associated with the...

5.9 MediumFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
High
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
None
Availability
None

Exploit likelihood

5.07%Up 3.1 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 5.9

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.

Record
CVE-2015-7744
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS 2.0
2.6 LowAV:N/AC:H/Au:N/C:P/I:N/A:N
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2015-7744
Updated
2026-11-02
EUVDEUVD-2015-7644 No score

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.

Record
EUVD-2015-7644
Updated
2026-11-03
GitHub AdvisoriesGHSA-f7wf-fgwg-64px 5.9

wolfSSL (formerly CyaSSL) before 3.6.8 does not properly handle faults associated with the...

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.

Record
GHSA-f7wf-fgwg-64px
CVSS 3.0
5.9 MediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSV 5.9

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.

Record
CVE-2015-7744
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVDEBIAN-CVE-2015-7744 5.9

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.

Record
DEBIAN-CVE-2015-7744
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
Show 5 moreShow less
OSVUBUNTU-CVE-2015-7744 5.9

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.

Record
UBUNTU-CVE-2015-7744
CVSS 3.1
5.9 MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Updated
2026-11-02
OSVopenSUSE-SU-2024:10200-1 No score

libmysql56client18-32bit-5.6.34-1.1 on GA media

These are all security issues fixed in the libmysql56client18-32bit-5.6.34-1.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:10200-1
Updated
2026-11-02
OSVSUSE-RU-2023:3956-1 No score

Recommended update for mariadb104

This update for mariadb104 fixes the following issues:

  • Implement version 10.4 of MariaDB (jsc#PED-2455):
    • It is possible to use more than one authentication plugin for each user account.
    • The root user account is being created with the ability to use two authentication plugins.
    • All user accounts, passwords, and global privileges are now stored in the mysql.global_priv table.
    • Is being supported for User Password Expiry, which is not active by default.
    • Faster privilege checks for MariaDB setups with many user accounts or many database grants.
  • Update mysql-systemd-helper to be aware of custom group (bsc#1200105)
  • MariaDB is now support lz4 compression for 'INNODB'. (bsc#1186031)
  • Add 'mysql-user.conf' file to enable systemd generating mysql user in containers. (bsc#1173028)
  • Fixes an issue when MariaDB is ignoring the value of the parameter 'open_files_limit' in the global variables. (bsc#1180014)
Record
SUSE-RU-2023:3956-1
Updated
2026-11-02
OSVSUSE-RU-2023:4991-1 No score

Recommended update for mariadb104

This update for mariadb104 fixes the following issues:

  • Implement version 10.4 of MariaDB (jsc#PED-2455):
    • It is possible to use more than one authentication plugin for each user account.
    • The root user account is being created with the ability to use two authentication plugins.
    • All user accounts, passwords, and global privileges are now stored in the mysql.global_priv table.
    • Is being supported for User Password Expiry, which is not active by default.
    • Faster privilege checks for MariaDB setups with many user accounts or many database grants.
  • Update mysql-systemd-helper to be aware of custom group (bsc#1200105)
  • MariaDB is now support lz4 compression for 'INNODB'. (bsc#1186031)
  • Add 'mysql-user.conf' file to enable systemd generating mysql user in containers. (bsc#1173028)
  • Fixes an issue when MariaDB is ignoring the value of the parameter 'open_files_limit' in the global variables. (bsc#1180014)
Record
SUSE-RU-2023:4991-1
Updated
2026-11-02
OSVSUSE-SU-2016:0348-1 No score

Security update for mysql

This update to MySQL 5.5.47 fixes the following issues (bsc#962779):

  • CVE-2015-7744: Lack of verification against 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.
  • CVE-2016-0502: Unspecified vulnerability in Oracle MySQL 5.5.31 and earlier and 5.6.11 and earlier allows remote authenticated users to affect availability via unknown vectors related to Optimizer.
  • CVE-2016-0505: Unspecified vulnerability in Oracle MySQL 5.5.46 and earlier, 5.6.27 and earlier, and 5.7.9 allows remote authenticated users to affect availability via unknown vectors related to Options.
  • CVE-2016-0546: Unspecified vulnerability in Oracle MySQL 5.5.46 and earlier, 5.6.27 and earlier, and 5.7.9 allows local users to affect confidentiality, integrity, and availability via unknown vectors related to Client.
  • CVE-2016-0596: Unspecified vulnerability in Oracle MySQL 5.5.46 and earlier and 5.6.27 and earlier allows remote authenticated users to affect availability via vectors related to DML.
  • CVE-2016-0597: Unspecified vulnerability in Oracle MySQL 5.5.46 and earlier, 5.6.27 and earlier, and 5.7.9 allows remote authenticated users to affect availability via unknown vectors related to Optimizer.
  • CVE-2016-0598: Unspecified vulnerability in Oracle MySQL 5.5.46 and earlier, 5.6.27 and earlier, and 5.7.9 allows remote authenticated users to affect availability via vectors related to DML.
  • CVE-2016-0600: Unspecified vulnerability in Oracle MySQL 5.5.46 and earlier, 5.6.27 and earlier, and 5.7.9 allows remote authenticated users to affect availability via unknown vectors related to InnoDB.
  • CVE-2016-0606: Unspecified vulnerability in Oracle MySQL 5.5.46 and earlier, 5.6.27 and earlier, and 5.7.9 allows remote authenticated users to affect integrity via unknown vectors related to encryption.
  • CVE-2016-0608: Unspecified vulnerability in Oracle MySQL 5.5.46 and earlier, 5.6.27 and earlier, and 5.7.9 allows remote authenticated users to affect availability via vectors related to UDF.
  • CVE-2016-0609: Unspecified vulnerability in Oracle MySQL 5.5.46 and earlier, 5.6.27 and earlier, and 5.7.9 allows remote authenticated users to affect availability via unknown vectors related to privileges.
  • CVE-2016-0616: Unspecified vulnerability in Oracle MySQL 5.5.46 and earlier allows remote authenticated users to affect availability via unknown vectors related to Optimizer.
  • bsc#959724: Possible buffer overflow from incorrect use of strcpy() and sprintf()

The following bugs were fixed:

  • bsc#960961: Incorrect use of plugin-load option in default_plugins.cnf
Record
SUSE-SU-2016:0348-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
wolfssl
Debian:12
before 3.9.10+dfsg-1
3.9.10+dfsg-1
wolfssl
Debian:13
before 3.9.10+dfsg-1
3.9.10+dfsg-1
mariadb104
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS
From an advisory covering 221 CVEs
before 10.4.30-150100.3.5.10
10.4.30-150100.3.5.10
python-mysqlclient
SUSE:Linux Enterprise High Performance Computing 15 SP1-LTSS
From an advisory covering 221 CVEs
before 1.4.6-150100.3.3.7
1.4.6-150100.3.3.7
mariadb104
SUSE:Linux Enterprise Server 15 SP1-LTSS
From an advisory covering 221 CVEs
before 10.4.30-150100.3.5.10
10.4.30-150100.3.5.10
python-mysqlclient
SUSE:Linux Enterprise Server 15 SP1-LTSS
From an advisory covering 221 CVEs
before 1.4.6-150100.3.3.7
1.4.6-150100.3.3.7
mariadb104
SUSE:Linux Enterprise Server for SAP Applications 15 SP1
From an advisory covering 221 CVEs
before 10.4.30-150100.3.5.10
10.4.30-150100.3.5.10
python-mysqlclient
SUSE:Linux Enterprise Server for SAP Applications 15 SP1
From an advisory covering 221 CVEs
before 1.4.6-150100.3.3.7
1.4.6-150100.3.3.7
lz4
SUSE:Linux Enterprise Software Development Kit 12 SP5
From an advisory covering 221 CVEs
before 1.8.0-3.5.2
1.8.0-3.5.2
mariadb-connector-c
SUSE:Linux Enterprise Software Development Kit 12 SP5
From an advisory covering 221 CVEs
before 3.1.22-2.35.1
3.1.22-2.35.1
Show 24 moreShow less
Affected packages
PackageAffectedFixed
mariadb104
SUSE:Linux Enterprise Software Development Kit 12 SP5
From an advisory covering 221 CVEs
before 10.4.30-8.5.46
10.4.30-8.5.46
python-mysqlclient
SUSE:Linux Enterprise Software Development Kit 12 SP5
From an advisory covering 221 CVEs
before 1.3.14-8.9.2
1.3.14-8.9.2
lz4
SUSE:Linux Enterprise Server 12 SP5
From an advisory covering 221 CVEs
before 1.8.0-3.5.2
1.8.0-3.5.2
mariadb-connector-c
SUSE:Linux Enterprise Server 12 SP5
From an advisory covering 221 CVEs
before 3.1.22-2.35.1
3.1.22-2.35.1
mariadb104
SUSE:Linux Enterprise Server 12 SP5
From an advisory covering 221 CVEs
before 10.4.30-8.5.46
10.4.30-8.5.46
python-mysqlclient
SUSE:Linux Enterprise Server 12 SP5
From an advisory covering 221 CVEs
before 1.3.14-8.9.2
1.3.14-8.9.2
lz4
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
From an advisory covering 221 CVEs
before 1.8.0-3.5.2
1.8.0-3.5.2
mariadb-connector-c
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
From an advisory covering 221 CVEs
before 3.1.22-2.35.1
3.1.22-2.35.1
mariadb104
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
From an advisory covering 221 CVEs
before 10.4.30-8.5.46
10.4.30-8.5.46
python-mysqlclient
SUSE:Linux Enterprise Server for SAP Applications 12 SP5
From an advisory covering 221 CVEs
before 1.3.14-8.9.2
1.3.14-8.9.2
mysql
SUSE:Linux Enterprise Software Development Kit 11 SP3
From an advisory covering 12 CVEs
before 5.5.47-0.17.1
5.5.47-0.17.1
mysql
SUSE:Linux Enterprise Software Development Kit 11 SP4
From an advisory covering 12 CVEs
before 5.5.47-0.17.1
5.5.47-0.17.1
mysql
SUSE:Linux Enterprise Desktop 11 SP3
From an advisory covering 12 CVEs
before 5.5.47-0.17.1
5.5.47-0.17.1
mysql
SUSE:Linux Enterprise Desktop 11 SP4
From an advisory covering 12 CVEs
before 5.5.47-0.17.1
5.5.47-0.17.1
mysql
SUSE:Linux Enterprise Server 11 SP3
From an advisory covering 12 CVEs
before 5.5.47-0.17.1
5.5.47-0.17.1
mysql
SUSE:Linux Enterprise Server 11 SP3-TERADATA
From an advisory covering 12 CVEs
before 5.5.47-0.17.1
5.5.47-0.17.1
mysql
SUSE:Linux Enterprise Server for SAP Applications 11 SP3
From an advisory covering 12 CVEs
before 5.5.47-0.17.1
5.5.47-0.17.1
mysql
SUSE:Linux Enterprise Server 11 SP4
From an advisory covering 12 CVEs
before 5.5.47-0.17.1
5.5.47-0.17.1
mysql
SUSE:Linux Enterprise Server for SAP Applications 11 SP4
From an advisory covering 12 CVEs
before 5.5.47-0.17.1
5.5.47-0.17.1
mariadb-5.5
Ubuntu:14.04:LTS
before 5.5.46-1ubuntu0.14.04.2, plus listed versions
5.5.32-1ubuntu15.5.35-1ubuntu15.5.36-15.5.37-0ubuntu0.14.04.15.5.39-0ubuntu0.14.04.1
Show 5 moreShow less
5.5.40-0ubuntu0.14.04.15.5.41-0ubuntu0.14.04.25.5.41-1ubuntu0.14.04.15.5.43-1ubuntu0.14.04.25.5.44-1ubuntu0.14.04.1
5.5.46-1ubuntu0.14.04.2
mysql-5.5
Ubuntu:14.04:LTS
before 5.5.46-0ubuntu0.14.04.2, plus listed versions
5.5.32-0ubuntu75.5.34-0ubuntu15.5.34-0ubuntu25.5.35-0ubuntu15.5.35+dfsg-1ubuntu1
Show 6 moreShow less
5.5.37-0ubuntu0.14.04.15.5.38-0ubuntu0.14.04.15.5.40-0ubuntu0.14.04.15.5.41-0ubuntu0.14.04.15.5.43-0ubuntu0.14.04.15.5.44-0ubuntu0.14.04.1
5.5.46-0ubuntu0.14.04.2
mysql-5.6
Ubuntu:14.04:LTS
before 5.6.27-0ubuntu0.14.04.1, plus listed versions
5.6.15-0ubuntu15.6.15-1~exp25.6.16-1~exp15.6.17-0ubuntu0.14.04.15.6.19-0ubuntu0.14.04.1
5.6.27-0ubuntu0.14.04.1
percona-xtradb-cluster-5.6
Ubuntu:16.04:LTS
before 5.6.34-26.19-0ubuntu0.16.04.1, plus listed versions
5.6.21-25.8-0ubuntu25.6.21-25.8-0ubuntu35.6.21-25.8-0ubuntu3.15.6.21-25.8-0ubuntu3.2
5.6.34-26.19-0ubuntu0.16.04.1
percona-server-5.6
Ubuntu:16.04:LTS
All versions, plus listed versions
5.6.22-rel71.0-0ubuntu25.6.22-rel71.0-0ubuntu45.6.22-rel71.0-0ubuntu4.1
None known

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2015-7744 is a medium vulnerability (CVSS 5.9) in Wolfssl, published January 22, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 5.07%, the 92nd percentile. Fixed in wolfssl 3.9.10+dfsg-1.

References

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Left out here: 303 references. The JSON record has them.

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