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CVE-2017-3731

7.5 · HIGH

If an SSL/TLS server or client is running on a 32-bit host, and a specific cipher is being used, then a truncated packet can cause that server or client to perform an out-of-bounds read, usually re…

Published May 4, 2017CWE-125EPSS 57.32%

Overview

CVE-2017-3731 is a high-severity vulnerability. It was published on May 4, 2017 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

If an SSL/TLS server or client is running on a 32-bit host, and a specific cipher is being used, then a truncated packet can cause that server or client to perform an out-of-bounds read, usually resulting in a crash. For OpenSSL 1.1.0, the crash can be triggered when using CHACHA20/POLY1305; users should upgrade to 1.1.0d. For Openssl 1.0.2, the crash can be triggered when using RC4-MD5; users who have not disabled that algorithm should update to 1.0.2k.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refrhn.redhat.com/errata/RHSA-2017-0286.htmlRefwww.debian.org/security/2017/dsa-3773Refwww.oracle.com/technetwork/security-advisory/cpujan2018-3236628.htmlRefwww.oracle.com/technetwork/security-advisory/cpujul2017-3236622.htmlRefwww.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlRefwww.securityfocus.com/bid/95813Refwww.securitytracker.com/id/1037717Refaccess.redhat.com/errata/RHSA-2018:2185Refaccess.redhat.com/errata/RHSA-2018:2186Refaccess.redhat.com/errata/RHSA-2018:2187

How CyberStrike helps

Frequently asked questions

What is CVE-2017-3731?

CVE-2017-3731 is a high-severity vulnerability. It was published on May 4, 2017 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2017-3731?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2017-3731?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2017-3731?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2017-3731 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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