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CVE-2015-3193

7.5 · HIGH

The Montgomery squaring implementation in crypto/bn/asm/x86_64-mont5.pl in OpenSSL 1.0.2 before 1.0.2e on the x86_64 platform, as used by the BN_mod_exp function, mishandles carry propagation and p…

Published Dec 6, 2015opensslCWE-200EPSS 25.14%

Overview

CVE-2015-3193 is a high-severity vulnerability affecting openssl openssl. It was published on December 6, 2015 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

The Montgomery squaring implementation in crypto/bn/asm/x86_64-mont5.pl in OpenSSL 1.0.2 before 1.0.2e on the x86_64 platform, as used by the BN_mod_exp function, mishandles carry propagation and produces incorrect output, which makes it easier for remote attackers to obtain sensitive private-key information via an attack against use of a (1) Diffie-Hellman (DH) or (2) Diffie-Hellman Ephemeral (DHE) ciphersuite.

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
nodejsnode.js4.0.0Affected

References

Reffortiguard.com/advisory/openssl-advisory-december-2015Refkb.juniper.net/InfoCenter/index?page=content&id=JSA10759Refkb.juniper.net/InfoCenter/index?page=content&id=JSA10761Refopenssl.org/news/secadv/20151203.txtReftools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-opensslRefwww.fortiguard.com/advisory/openssl-advisory-december-2015Refwww.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.htmlRefwww.oracle.com/technetwork/security-advisory/cpujul2016-2881720.htmlRefwww.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlRefwww.securityfocus.com/bid/78705

How CyberStrike helps

Frequently asked questions

What is CVE-2015-3193?

CVE-2015-3193 is a high-severity vulnerability affecting openssl openssl. It was published on December 6, 2015 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2015-3193?

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-2015-3193?

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-2015-3193?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2015-3193 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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