CVE-2015-3193

Name: CVE-2015-3193
Creator: NVD / NIST
Published: 2015-12-06T20:59:02.613+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 25.14%

Last modified Jun 17, 2026

CVE-2015-3193 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 25.14% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

25.14%

97.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions
Openssl	Openssl	1.0.2
Openssl	Openssl	1.0.2a
Openssl	Openssl	1.0.2b
Openssl	Openssl	1.0.2c
Openssl	Openssl	1.0.2d
Nodejs	Node.Js	>= 4.0.0, <= 4.1.2
Nodejs	Node.Js	>= 4.2.0, < 4.2.3
Nodejs	Node.Js	>= 5.0.0, < 5.1.1
Canonical	Ubuntu Linux	12.04
Canonical	Ubuntu Linux	14.04
Canonical	Ubuntu Linux	15.04
Canonical	Ubuntu Linux	15.10

References

http://fortiguard.com/advisory/openssl-advisory-december-2015Third Party Advisory
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759Third Party Advisory
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761Third Party Advisory
http://openssl.org/news/secadv/20151203.txtVendor Advisory
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-opensslThird Party Advisory
http://www.fortiguard.com/advisory/openssl-advisory-december-2015Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlPatch, Third Party Advisory
http://www.securityfocus.com/bid/78705Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/91787Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1034294Third Party Advisory, VDB Entry
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.539966Third Party Advisory
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.754583Third Party Advisory
http://www.ubuntu.com/usn/USN-2830-1Third Party Advisory
https://blog.fuzzing-project.org/31-Fuzzing-Math-miscalculations-in-OpenSSLs-BN_mod_exp-CVE-2015-3193.htmlThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1288317Issue Tracking, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=d73cc256c8e256c32ed959456101b73ba9842f72
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05398322Third Party Advisory
https://kb.isc.org/article/AA-01438Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40100Third Party Advisory
http://fortiguard.com/advisory/openssl-advisory-december-2015Third Party Advisory
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759Third Party Advisory
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761Third Party Advisory
http://openssl.org/news/secadv/20151203.txtVendor Advisory
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-opensslThird Party Advisory
http://www.fortiguard.com/advisory/openssl-advisory-december-2015Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.htmlPatch, Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.htmlPatch, Third Party Advisory
http://www.securityfocus.com/bid/78705Third Party Advisory, VDB Entry
http://www.securityfocus.com/bid/91787Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1034294Third Party Advisory, VDB Entry
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.539966Third Party Advisory
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2015&m=slackware-security.754583Third Party Advisory
http://www.ubuntu.com/usn/USN-2830-1Third Party Advisory
https://blog.fuzzing-project.org/31-Fuzzing-Math-miscalculations-in-OpenSSLs-BN_mod_exp-CVE-2015-3193.htmlThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1288317Issue Tracking, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
https://git.openssl.org/?p=openssl.git%3Ba=commit%3Bh=d73cc256c8e256c32ed959456101b73ba9842f72
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05398322Third Party Advisory
https://kb.isc.org/article/AA-01438Third Party Advisory
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA40100Third Party Advisory

Timeline

Published: Dec 6, 2015
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-3193?

How severe is CVE-2015-3193?

CVE-2015-3193 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 25.14% probability of exploitation in the next 30 days.

How do I fix CVE-2015-3193?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2015-3193?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST