Is CVE-2017-3309 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 3%.

What products does CVE-2017-3309 affect?

Tracked products affected include MySQL. Check the version you run to see whether it is affected.

How do I fix CVE-2017-3309?

Apply the vendor fix promptly. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2017-3309

Q: What is CVE-2017-3309?

CVE-2017-3309 is a high-severity software vulnerability with a CVSS score of 7.7. Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Optimizer). Supported versions that are affected are 5.5.54 and earlier, 5.6.35 and earlier and 5.7.17 and earlier. Easily "exploitable" vulnerability allows

HIGH severity · CVSS 7.7

7.7CVSS HIGH

Summary

Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Optimizer). Supported versions that are affected are 5.5.54 and earlier, 5.6.35 and earlier and 5.7.17 and earlier. Easily "exploitable" vulnerability allows low privileged attacker with network access via multiple protocols to compromise MySQL Server. While the vulnerability is in MySQL Server, attacks may significantly impact additional products. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.0 Base Score 7.7 (Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H).

Impact & exploitability

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)3%

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

Affected products we track (1)

MySQL

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: http://www.oracle.com/technetwork/security-advisory/cpuapr2017-3236618.html ↗

Additional information

NVD record
http://www.oracle.com/technetwork/security-advisory/cpuapr2017-3236618.htmlPatch
http://www.debian.org/security/2017/dsa-3834Advisory
http://www.debian.org/security/2017/dsa-3944Advisory
http://www.securityfocus.com/bid/97742Advisory
http://www.securitytracker.com/id/1038287Advisory
https://access.redhat.com/errata/RHSA-2017:2192Advisory
https://access.redhat.com/errata/RHSA-2017:2787Advisory
https://access.redhat.com/errata/RHSA-2017:2886Advisory