Description
Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: C API). Supported versions that are affected are 5.5.55 and earlier and 5.6.35 and earlier. Difficult to exploit vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all MySQL Server accessible data. CVSS 3.0 Base Score 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N). NOTE: the previous information is from the April 2017 CPU. Oracle has not commented on third-party claims that this issue allows man-in-the-middle attackers to hijack the authentication of users by leveraging incorrect ordering of security parameter verification in a client, aka, "The Riddle".
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Oracle | MySQL Server | 5.5.55 and earlier, 5.6.35 and earlier | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | mysql-5.5 | 5.5.55-0+deb8u1 | DSA-3834-1 |
| Debian 7 | mysql-5.5 | 5.5.55-0+deb7u1 | DLA-916-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | mysql-5.7 | 5.7.18-0ubuntu0.16.04.1 | USN-3269-1 |
| Ubuntu 16.04 LTS | percona-server-5.6 +1 | No fix yet | — |
| Ubuntu 14.04 LTS | mysql-5.5 | 5.5.55-0ubuntu0.14.04.1 | USN-3269-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 2 | rh-mysql56-mysql +7 | 5.6.37-5.el6 | RHSA-2017:2787 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | mysql | 5.5.55-0.38.1 | SUSE-SU-2017:1137-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 11 SP4 | mysql | 5.5.55-0.38.1 | SUSE-SU-2017:1137-1 |
Advisories 5
- RHSA-2017:2787 Red Hat Security Advisory: rh-mysql56-mysql security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-3269-1 mysql-5.5, mysql-5.7 vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-916-1 mysql-5.5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3834-1 mysql-5.5 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:1137-1 Security update for mysql SUSE / openSUSE Security Updates · Feb 4, 2026
References
- RHSA-2017:2787 vendor-advisory
- [oss-security] 20170317 CVE-2017-3305 - The Riddle vulnerability in MySQL client (public disclosure) mailing-list
- 1038287 vdb-entry
- http://riddle.link/
- http://www.oracle.com/technetwork/security-advisory/cpuapr2017-3236618.html
- DSA-3834 vendor-advisory
- 97023 vdb-entry