High 7.5Published Dec 6, 2015

CVE-2015-3193The 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 pro…

Updated under an hour ago (Nov 2, 2026, 12:10 AM ET)

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No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Weakness (CWE): CWE-200
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Modified
Record last updated: Jun 16, 2026
First seen by InfoSec Signals: Nov 1, 2026

Affected products

Affected products

openssl openssl openssl:openssl	1.0.2; 1.0.2a; 1.0.2b; 1.0.2c; 1.0.2d	NVD
nodejs node.js nodejs:node.js	from 4.0.0 through 4.1.2; from 4.2.0 before 4.2.3; from 5.0.0 before 5.1.1	NVD
canonical ubuntu_linux canonical:ubuntu_linux	12.04; 14.04; 15.04; 15.10	NVD

References

References

http://fortiguard.com/advisory/openssl-advisory-december-2015	third-party-advisory
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10759	third-party-advisory
http://kb.juniper.net/InfoCenter/index?page=content&id=JSA10761	third-party-advisory
http://openssl.org/news/secadv/20151203.txt	vendor-advisory
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20151204-openssl	third-party-advisory
http://www.fortiguard.com/advisory/openssl-advisory-december-2015	third-party-advisory
http://www.oracle.com/technetwork/security-advisory/cpuapr2016v3-2985753.html	patch, third-party-advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2016-2881720.html	patch, third-party-advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html	patch, third-party-advisory
http://www.securityfocus.com/bid/78705	third-party-advisory, vdb-entry
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.