CVE-2017-3731 | Truncated packet could crash via OOB read

If an SSL/TLS server or client is running on a 32-bit host, and a specific cipher is being used, then a truncated packet can cause that server or client to perform an out-of-bounds read, usually resulting in a crash. For OpenSSL 1.1.0, the crash can be triggered when using CHACHA20/POLY1305; users should upgrade to 1.1.0d. For Openssl 1.0.2, the crash can be triggered when using RC4-MD5; users who have not disabled that algorithm should update to 1.0.2k.

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-2017-3731 is rated High Risk (69.6/100): CVSS High severity, with high exploitation likelihood (EPSS 57.59%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +47.19% 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-2017-3731

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 10.40% 57.59% +47.19%
2 2026-05-27 9.42% 10.40% +0.99%
3 2026-05-24 — 9.42% —

Full EPSS history (28 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-3731

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 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: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:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P 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:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-3731

OS Trackers for CVE-2017-3731

vendor priority summary link
debian not yet assigned CVE-2017-3731 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-2017-3731
gentoo normal CVE-2017-3731: 1 GLSA(s) (201702-07), 1 atom(s) (dev-libs/openssl); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-3731
redhat medium — https://access.redhat.com/security/cve/CVE-2017-3731
suse medium CVE-2017-3731 severity moderate: SUSE including 487 source package names (0.9.1:libopenssl1_0_0-1.0.2j-59.1, 0.9.1:openssl-1.0.2j-59.1, …), 769 product×package rows across 101 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (101 product lines)): Fixed 423, Known Not Affected 189, Known Affected 157. https://www.suse.com/security/cve/CVE-2017-3731/
ubuntu medium CVE-2017-3731 medium priority: Ubuntu including 2 source packages (openssl, openssl098), 20 status rows across 10 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, xenial, yakkety, zesty): released 9, DNE 8, needs-triage 2, ignored 1. https://ubuntu.com/security/CVE-2017-3731

Affected software / configurations for CVE-2017-3731

Vendor Product Version Raw CPE
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 1.0.2 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 1.0.2j cpe:2.3:a:openssl:openssl:1.0.2j:*:*:*:*:*:*:*
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-2017-3731

URL Tags
http://rhn.redhat.com/errata/RHSA-2017-0286.html Third Party Advisory
http://www.debian.org/security/2017/dsa-3773 Third Party Advisory
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/95813 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://github.com/openssl/openssl/commit/00d965474b22b54e4275232bc71ee0c699c5cd21 Third Party Advisory
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://security.netapp.com/advisory/ntap-20171019-0002/ Third Party Advisory
https://security.paloaltonetworks.com/CVE-2017-3731 Third Party Advisory
https://source.android.com/security/bulletin/pixel/2017-11-01 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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