CVE-2017-3738

There is an overflow bug in the AVX2 Montgomery multiplication procedure used in exponentiation with 1024-bit moduli. 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 DH1024 are considered just feasible, 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 significant. However, for an attack on TLS to be meaningful, the server would have to share the DH1024 private key among multiple clients, which is no longer an option since CVE-2016-0701. This only affects processors that support the AVX2 but not ADX extensions like Intel Haswell (4th generation). Note: The impact from this issue is similar to CVE-2017-3736, CVE-2017-3732 and CVE-2015-3193. OpenSSL version 1.0.2-1.0.2m and 1.1.0-1.1.0g are affected. Fixed in OpenSSL 1.0.2n. Due to the low severity of this issue we are not issuing a new release of OpenSSL 1.1.0 at this time. The fix will be included in OpenSSL 1.1.0h when it becomes available. The fix is also available in commit e502cc86d in the OpenSSL git repository.

Published: 2017-12-07 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-3738 is rated Moderate Risk (55.1/100): CVSS Medium severity, with high exploitation likelihood (EPSS 13.41%, 96th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. 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-2017-3738

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 15.51% 13.41% -2.10%
2 2026-04-09 14.13% 15.51% +1.38%
3 2026-04-08 — 14.13% —

Full EPSS history (54 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-3738

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-2017-3738

OS Trackers for CVE-2017-3738

vendor priority summary link
debian low CVE-2017-3738 low 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-2017-3738
gentoo normal CVE-2017-3738: 1 GLSA(s) (201712-03), 1 atom(s) (dev-libs/openssl); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-3738
redhat low — https://access.redhat.com/security/cve/CVE-2017-3738
suse low CVE-2017-3738 severity low: SUSE including 488 source package names (0.9.1:libopenssl1_0_0-1.0.2j-60.20.2, 0.9.1:openssl-1.0.2j-60.20.2, …), 858 product×package rows across 100 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (100 product lines)): Fixed 484, Known Not Affected 217, Known Affected 157. https://www.suse.com/security/cve/CVE-2017-3738/
ubuntu low CVE-2017-3738 low priority: Ubuntu including 3 source packages (openssl, openssl098, openssl1.0), 22 status rows across 8 suites (artful, bionic, cosmic, disco, trusty, upstream, xenial, zesty): DNE 10, released 8, not-affected 3, needs-triage 1. https://ubuntu.com/security/CVE-2017-3738

Affected software / configurations for CVE-2017-3738

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 1.0.2g cpe:2.3:a:openssl:openssl:1.0.2g:*:*:*:*:*:*:*
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 1.0.2j cpe:2.3:a:openssl:openssl:1.0.2j:*:*:*:*:*:*:*
openssl openssl 1.0.2k cpe:2.3:a:openssl:openssl:1.0.2k:*:*:*:*:*:*:*
openssl openssl 1.0.2l cpe:2.3:a:openssl:openssl:1.0.2l:*:*:*:*:*:*:*
openssl openssl 1.0.2m cpe:2.3:a:openssl:openssl:1.0.2m:*:*:*:*:*:*:*
openssl openssl 1.1.0 cpe:2.3:a:openssl:openssl:1.1.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
openssl openssl 1.1.0d cpe:2.3:a:openssl:openssl:1.1.0d:*:*:*:*:*:*:*
openssl openssl 1.1.0e cpe:2.3:a:openssl:openssl:1.1.0e:*:*:*:*:*:*:*
openssl openssl 1.1.0f cpe:2.3:a:openssl:openssl:1.1.0f:*:*:*:*:*:*:*
openssl openssl 1.1.0g cpe:2.3:a:openssl:openssl:1.1.0g:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
nodejs node.js >= 4.0.0, <= 4.1.2 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 4.2.0, < 4.8.7 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 6.0.0, <= 6.8.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 6.9.0, < 6.12.2 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 8.0.0, <= 8.8.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*
nodejs node.js >= 8.9.0, < 8.9.3 cpe:2.3:a:nodejs:node.js:*:*:*:*:lts:*:*:*
nodejs node.js >= 9.0.0, < 9.2.1 cpe:2.3:a:nodejs:node.js:*:*:*:*:-:*:*:*

References for CVE-2017-3738

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/102118 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1039978 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://github.com/openssl/openssl/commit/e502cc86df9dafded1694fceb3228ee34d11c11a Patch Third Party Advisory
https://nodejs.org/en/blog/vulnerability/december-2017-security-releases/ Vendor Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-17:12.openssl.asc Third Party Advisory
https://security.gentoo.org/glsa/201712-03 Third Party Advisory
https://security.netapp.com/advisory/ntap-20171208-0001/ 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-4065 Third Party Advisory
https://www.debian.org/security/2018/dsa-4157 Third Party Advisory
https://www.openssl.org/news/secadv/20171207.txt Vendor Advisory
https://www.openssl.org/news/secadv/20180327.txt Vendor Advisory
https://www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html Patch Third Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpujan2019-5072801.html Patch Third Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpujul2019-5072835.html Patch Third Party Advisory
https://www.tenable.com/security/tns-2017-16 Third Party Advisory
https://www.tenable.com/security/tns-2018-04 Third Party Advisory
https://www.tenable.com/security/tns-2018-06 Third Party Advisory
https://www.tenable.com/security/tns-2018-07 Third Party Advisory
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