CVE-2017-3736

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.

Published: 2017-11-02 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-3736 is rated Moderate Risk (61.1/100): CVSS Medium severity, with high exploitation likelihood (EPSS 10.13%, 95th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.85% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-3736

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 8.29% 10.13% +1.85%
2 2026-05-14 8.49% 8.29% -0.21%
3 2026-05-01 — 8.49% —

Full EPSS history (59 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-3736

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 3.6 [email protected]
4.0 2.0 MEDIUM
AV:N/AC:L/Au:S/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.0 2.9 [email protected]

Weakness enumeration for CVE-2017-3736

OS Trackers for CVE-2017-3736

vendor priority summary link
debian not yet assigned CVE-2017-3736 not yet assigned priority: Debian including 1 source packages (openssl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-3736
gentoo normal CVE-2017-3736: 1 GLSA(s) (201712-03), 1 atom(s) (dev-libs/openssl); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-3736
redhat medium — https://access.redhat.com/security/cve/CVE-2017-3736
suse medium CVE-2017-3736 severity moderate: SUSE including 503 source package names (0.9.1:libopenssl1_0_0-1.0.2j-60.16.1, 0.9.1:openssl-1.0.2j-60.16.1, …), 1077 product×package rows across 160 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (160 product lines)): Fixed 717, Known Not Affected 203, Known Affected 157. https://www.suse.com/security/cve/CVE-2017-3736/
ubuntu medium CVE-2017-3736 medium priority: Ubuntu including 2 source packages (openssl, openssl098), 16 status rows across 8 suites (artful, bionic, cosmic, disco, trusty, upstream, xenial, zesty): DNE 7, released 7, needs-triage 1, not-affected 1. https://ubuntu.com/security/CVE-2017-3736

Affected software / configurations for CVE-2017-3736

Vendor Product Version Raw CPE
openssl openssl >= 1.0.2, < 1.0.2m cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl openssl >= 1.1.0, < 1.1.0g cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*

References for CVE-2017-3736

URL Tags
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
https://access.redhat.com/errata/RHSA-2018:2568 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2575 Third Party Advisory
https://access.redhat.com/errata/RHSA-2018:2713 Third Party Advisory
https://github.com/openssl/openssl/commit/4443cf7aa0099e5ce615c18cee249fff77fb0871 Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:11.openssl.asc Third Party Advisory
https://security.gentoo.org/glsa/201712-03 Third Party Advisory
https://security.netapp.com/advisory/ntap-20171107-0002/ Issue Tracking Third Party Advisory
https://security.netapp.com/advisory/ntap-20180117-0002/ Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbst03881en_us Third Party Advisory
https://www.debian.org/security/2017/dsa-4017 Issue Tracking Third Party Advisory
https://www.debian.org/security/2017/dsa-4018 Issue Tracking Third Party Advisory
https://www.openssl.org/news/secadv/20171102.txt Issue Tracking Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html
https://www.tenable.com/security/tns-2017-14 Issue Tracking Third Party Advisory
https://www.tenable.com/security/tns-2017-15 Third Party Advisory
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