CVE-2017-3732 | BN_mod_exp may produce incorrect results on x86_64

There is a carry propagating bug in the x86_64 Montgomery squaring procedure in OpenSSL 1.0.2 before 1.0.2k and 1.1.0 before 1.1.0d. 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. For example this can occur by default in OpenSSL DHE based SSL/TLS ciphersuites. Note: This issue is very similar to CVE-2015-3193 but must be treated as a separate problem.

Published: 2017-05-04 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-3732 is rated Moderate Risk (62.4/100): CVSS Medium severity, with high exploitation likelihood (EPSS 15.93%, 96th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +10.15% 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-2017-3732

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 5.79% 15.93% +10.15%
2 2026-06-13 5.18% 5.79% +0.60%
3 2026-05-27 — 5.18% —

Full EPSS history (61 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-3732

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.9 3.1 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
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.
 2.2 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2017-3732

OS Trackers for CVE-2017-3732

vendor priority summary link
debian not yet assigned CVE-2017-3732 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-2017-3732
gentoo high CVE-2017-3732: 2 GLSA(s) (201702-07, 201802-04), 2 atom(s) (dev-db/mysql, dev-libs/openssl); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-3732
redhat medium — https://access.redhat.com/security/cve/CVE-2017-3732
suse low CVE-2017-3732 severity low: SUSE including 477 source package names (0.9.1:libopenssl1_0_0-1.0.2j-59.1, 0.9.1:openssl-1.0.2j-59.1, …), 968 product×package rows across 162 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (162 product lines)): Fixed 610, Known Not Affected 201, Known Affected 157. https://www.suse.com/security/cve/CVE-2017-3732/
ubuntu medium CVE-2017-3732 medium priority: Ubuntu including 2 source packages (openssl, openssl098), 10 status rows across 5 suites (precise, trusty, upstream, xenial, yakkety): not-affected 4, DNE 3, released 2, needs-triage 1. https://ubuntu.com/security/CVE-2017-3732

Affected software / configurations for CVE-2017-3732

Vendor Product Version Raw CPE
openssl openssl 1.0.2 cpe:2.3:a:openssl:openssl:1.0.2:*:*:*:*:*:*:*
openssl openssl 1.0.2 cpe:2.3:a:openssl:openssl:1.0.2:beta1:*:*:*:*:*:*
openssl openssl 1.0.2 cpe:2.3:a:openssl:openssl:1.0.2:beta2:*:*:*:*:*:*
openssl openssl 1.0.2 cpe:2.3:a:openssl:openssl:1.0.2:beta3:*:*:*:*:*:*
openssl openssl 1.0.2a cpe:2.3:a:openssl:openssl:1.0.2a:*:*:*:*:*:*:*
openssl openssl 1.0.2b cpe:2.3:a:openssl:openssl:1.0.2b:*:*:*:*:*:*:*
openssl openssl 1.0.2c cpe:2.3:a:openssl:openssl:1.0.2c:*:*:*:*:*:*:*
openssl openssl 1.0.2d cpe:2.3:a:openssl:openssl:1.0.2d:*:*:*:*:*:*:*
openssl openssl 1.0.2e cpe:2.3:a:openssl:openssl:1.0.2e:*:*:*:*:*:*:*
openssl openssl 1.0.2f cpe:2.3:a:openssl:openssl:1.0.2f:*:*:*:*:*:*:*
openssl openssl 1.0.2h cpe:2.3:a:openssl:openssl:1.0.2h:*:*:*:*:*:*:*
openssl openssl 1.0.2i cpe:2.3:a:openssl:openssl:1.0.2i:*:*:*:*:*:*:*
openssl openssl 1.1.0a cpe:2.3:a:openssl:openssl:1.1.0a:*:*:*:*:*:*:*
openssl openssl 1.1.0b cpe:2.3:a:openssl:openssl:1.1.0b:*:*:*:*:*:*:*
openssl openssl 1.1.0c cpe:2.3:a:openssl:openssl:1.1.0c:*:*:*:*:*:*:*
nodejs node.js >= 4.0.0, <= 4.1.2 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 4.2.0, < 4.7.3 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 5.0.0, <= 5.12.0 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 6.0.0, <= 6.8.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 6.9.0, < 6.9.5 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 7.0.0, < 7.5.0 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*

References for CVE-2017-3732

URL Tags
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html Patch Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html Patch Third Party Advisory
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html Patch Third Party Advisory
http://www.securityfocus.com/bid/95814 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1037717 Third Party Advisory VDB Entry
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/a59b90bf491410f1f2bc4540cc21f1980fd14c5b Patch
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:02.openssl.asc Third Party Advisory
https://security.gentoo.org/glsa/201702-07 Third Party Advisory
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03838en_us Third Party Advisory
https://www.openssl.org/news/secadv/20170126.txt Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html Patch Third Party Advisory
https://www.tenable.com/security/tns-2017-04 Third Party Advisory
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