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Fencer Intel
medium 5.5

CVE-2016-7440 json

The C software implementation of AES Encryption and Decryption in wolfSSL (formerly CyaSSL) before 3.9.10 makes it easier for local users t…

published 2016-12-13 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-8293

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 23%
public exploits
0
none known

Summary

The C software implementation of AES Encryption and Decryption in wolfSSL (formerly CyaSSL) before 3.9.10 makes it easier for local users to discover AES keys by leveraging cache-bank timing differences.

Patch / fix

  • mariadb mariadb 5.5.53, 10.0.28, 10.1.19
  • wolfssl wolfssl 3.9.10
  • wolfssl Debian 13, Debian 12 3.9.10+dfsg-1

debian advisories DEBIAN-CVE-2016-7440

  • mysql-5.5 Ubuntu 14.04 LTS 5.5.53-0ubuntu0.14.04.1
  • mysql-5.7 Ubuntu 16.04 LTS 5.7.16-0ubuntu0.16.04.1
  • mariadb-5.5 Ubuntu 14.04 LTS 5.5.53-1ubuntu0.14.04.1
  • mariadb-10.0 Ubuntu 16.04 LTS 10.0.28-0ubuntu0.16.04.1

ubuntu advisories UBUNTU-CVE-2016-7440

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • mariadb104 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 10.4.30-8.5.46
  • lz4 SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.8.0-3.5.2
  • python-mysqlclient SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 1.3.14-8.9.2
  • mariadb-connector-c SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 3.1.22-2.35.1
  • mariadb SLES for SAP 12 SP2, SLES for SAP 12 SP1, SLES for Raspberry Pi 12 SP2 +8 more 10.0.28-17.2
  • mysql SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 5.5.53-0.30.1
  • mariadb104 SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 10.4.30-150100.3.5.10
  • python-mysqlclient SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 1.4.6-150100.3.3.7

suse advisories SUSE-RU-2023:4991-1SUSE-RU-2023:3956-1SUSE-SU-2016:2932-1SUSE-SU-2016:2933-1SUSE-SU-2016:2780-1

  • mariadb openSUSE Tumbleweed 10.6.4-2.1

opensuse advisories openSUSE-SU-2024:11038-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-7440 updated cvss 5.1

yaSSL: AES key leak via cache-bank timing side channel attack

  • Red Hat Enterprise Linux 5 mysql55-mysql Red Hat Enterprise Linux 6 mysql, mysql-libs, mysql-test, mysql-bench, mysql-server, mysql-embedded Red Hat Enterprise Linux 7 mariadb, mariadb-libs, mariadb-test, mariadb-bench, mariadb-server, mariadb-embedded Red Hat Enterprise Linux OpenStack Platform 5 (Icehouse) mariadb-galera Red Hat Enterprise Linux OpenStack Platform 6 (Juno) mariadb-galera Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) mariadb-galera, mariadb-galera-common, mariadb-galera-server
    +6 more products
    Red Hat OpenStack Platform 8 (Liberty) mariadb-galera, mariadb-galera-common, mariadb-galera-server Red Hat OpenStack Platform 9 (Mitaka) mariadb-galera, mariadb-galera-common, mariadb-galera-server Red Hat OpenStack Platform 10 (Newton) mariadb-galera, mariadb-galera-common, mariadb-galera-server Red Hat OpenStack Platform 11 (Ocata) mariadb-galera Red Hat OpenStack Platform 12 (Pike) mariadb-galera-common, mariadb-galera-server Red Hat Software Collections mysql55-mysql, rh-mysql56-mysql, rh-mysql57-mysql, mariadb55-mariadb, mysql55-mysql-libs, mysql55-mysql-test, +34 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.31% chance of exploitation in the next 30 days, higher than 23% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

Classification

Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.