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CVE-2015-4000

3.7 · LOW

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to…

Published May 21, 2015opensslCWE-310EPSS 99.86%

Overview

CVE-2015-4000 is a low-severity vulnerability affecting openssl openssl. It was published on May 21, 2015 and has a CVSS 3.1 base score of 3.7 (LOW).

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

The TLS protocol 1.2 and earlier, when a DHE_EXPORT ciphersuite is enabled on a server but not on a client, does not properly convey a DHE_EXPORT choice, which allows man-in-the-middle attackers to conduct cipher-downgrade attacks by rewriting a ClientHello with DHE replaced by DHE_EXPORT and then rewriting a ServerHello with DHE_EXPORT replaced by DHE, aka the "Logjam" issue.

Remediation

Check the references section for vendor advisories and patches from openssl. Update openssl to the latest patched version. 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.

Affected products

VendorProductVersionsStatus
opensslopenssl1.0.1Affected
appleiphone_os0Affected
applemac_os_x0Affected
oraclesparc-opl_service_processor0Affected

References

Refaix.software.ibm.com/aix/efixes/security/sendmail_advisory2.ascReffortiguard.com/advisory/2015-07-09-cve-2015-1793-openssl-alternative-chains-certificate-forgeryRefftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2015-008.txt.ascRefh20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c04876402Refh20564.www2.hpe.com/hpsc/doc/public/display?docId=emr_na-c04949778Refkb.juniper.net/InfoCenter/index?page=content&id=JSA10681Refkb.juniper.net/InfoCenter/index?page=content&id=JSA10727Reflists.apple.com/archives/security-announce/2015/Jun/msg00001.htmlReflists.apple.com/archives/security-announce/2015/Jun/msg00002.htmlReflists.fedoraproject.org/pipermail/package-announce/2015-June/159314.html

How CyberStrike helps

Frequently asked questions

What is CVE-2015-4000?

CVE-2015-4000 is a low-severity vulnerability affecting openssl openssl. It was published on May 21, 2015 and has a CVSS 3.1 base score of 3.7 (LOW).

How severe is CVE-2015-4000?

This vulnerability has a CVSS 3.1 base score of 3.7, rated LOW. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2015-4000?

Check the references section for vendor advisories and patches from openssl. Update openssl to the latest patched version. 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-2015-4000?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-4000 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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