Medium 6.5Published Nov 2, 2017

CVE-2017-3736There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL before 1.0.2m and 1.1.0 before 1.1.0g.

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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There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL before 1.0.2m and 1.1.0 before 1.1.0g. No EC algorithms are affected. Analysis suggests that attacks against RSA and DSA as a result of this defect would be very difficult to perform and are not believed likely. Attacks against DH are considered just feasible (although very difficult) because most of the work necessary to deduce information about a private key may be performed offline. The amount of resources required for such an attack would be very significant and likely only accessible to a limited number of attackers. An attacker would additionally need online access to an unpatched system using the target private key in a scenario with persistent DH parameters and a private key that is shared between multiple clients. This only affects processors that support the BMI1, BMI2 and ADX extensions like Intel Broadwell (5th generation) and later or AMD Ryzen.

CVSS: 6.5 MEDIUM (v3.0, NVD)CVSS:3.0/AV:N/AC:L/PR:L/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	from 1.0.2 before 1.0.2m; from 1.1.0 before 1.1.0g	NVD

References

References

http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html	patch, third-party-advisory
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html	patch, third-party-advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html	patch, third-party-advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html	patch, third-party-advisory
http://www.securityfocus.com/bid/101666	third-party-advisory, vdb-entry
http://www.securitytracker.com/id/1039727	third-party-advisory, vdb-entry
https://access.redhat.com/errata/RHSA-2018:0998	third-party-advisory
https://access.redhat.com/errata/RHSA-2018:2185	third-party-advisory
https://access.redhat.com/errata/RHSA-2018:2186	third-party-advisory
https://access.redhat.com/errata/RHSA-2018:2187	third-party-advisory
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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.