CVE-2017-14033

The decode method in the OpenSSL::ASN1 module in Ruby before 2.2.8, 2.3.x before 2.3.5, and 2.4.x through 2.4.1 allows attackers to cause a denial of service (interpreter crash) via a crafted string.

Published: 2017-09-19 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-14033 is rated Moderate Risk (64.6/100): CVSS High severity, with high exploitation likelihood (EPSS 7.73%, 94th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +1.75% 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-2017-14033

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 5.99% 7.73% +1.75%
2 2026-06-12 8.18% 5.99% -2.19%
3 2026-05-31 — 8.18% —

Full EPSS history (65 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-14033

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/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-2017-14033

GitHub Security Advisory for CVE-2017-14033

GHSA-v6rp-3r3v-hf4p · Severity: high · Ecosystem: rubygems — Ruby OpenSSL DoS Vulnerability

OS Trackers for CVE-2017-14033

vendor priority summary link
alpine — CVE-2017-14033: 1 source package rows (ruby); 10 state rows across 10 repos (3.10-main, 3.11-main, 3.12-main, 3.17-main, 3.18-main, 3.19-main, 3.20-main, 3.21-main, 3.22-main, edge-main); fixed 10, open 0. https://security.alpinelinux.org/vuln/CVE-2017-14033
gentoo normal CVE-2017-14033: 1 GLSA(s) (201710-18), 1 atom(s) (dev-lang/ruby); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2017-14033
redhat medium — https://access.redhat.com/security/cve/CVE-2017-14033
suse medium CVE-2017-14033 severity moderate: SUSE including 24 source package names (libruby2_1-2_1-2.1.9-19.3.2, ruby, …), 168 product×package rows across 60 product lines (HPE Helion OpenStack 8, Image SLES12-SP5-Azure-BYOS, … (60 product lines)): Fixed 140, Known Not Affected 23, Will Not Fix 5. https://www.suse.com/security/cve/CVE-2017-14033/
ubuntu medium CVE-2017-14033 medium priority: Ubuntu including 3 source packages (ruby1.9.1, ruby2.1, ruby2.3), 15 status rows across 5 suites (artful, trusty, upstream, xenial, zesty): DNE 8, needs-triage 3, released 3, ignored 1. https://ubuntu.com/security/CVE-2017-14033

Affected software / configurations for CVE-2017-14033

Vendor Product Version Raw CPE
ruby-lang ruby 2.2.0 cpe:2.3:a:ruby-lang:ruby:2.2.0:*:*:*:*:*:*:*
ruby-lang ruby 2.2.0 cpe:2.3:a:ruby-lang:ruby:2.2.0:preview1:*:*:*:*:*:*
ruby-lang ruby 2.2.0 cpe:2.3:a:ruby-lang:ruby:2.2.0:preview2:*:*:*:*:*:*
ruby-lang ruby 2.2.0 cpe:2.3:a:ruby-lang:ruby:2.2.0:rc1:*:*:*:*:*:*
ruby-lang ruby 2.2.1 cpe:2.3:a:ruby-lang:ruby:2.2.1:*:*:*:*:*:*:*
ruby-lang ruby 2.2.2 cpe:2.3:a:ruby-lang:ruby:2.2.2:*:*:*:*:*:*:*
ruby-lang ruby 2.2.3 cpe:2.3:a:ruby-lang:ruby:2.2.3:*:*:*:*:*:*:*
ruby-lang ruby 2.2.4 cpe:2.3:a:ruby-lang:ruby:2.2.4:*:*:*:*:*:*:*
ruby-lang ruby 2.2.5 cpe:2.3:a:ruby-lang:ruby:2.2.5:*:*:*:*:*:*:*
ruby-lang ruby 2.2.6 cpe:2.3:a:ruby-lang:ruby:2.2.6:*:*:*:*:*:*:*
ruby-lang ruby 2.2.7 cpe:2.3:a:ruby-lang:ruby:2.2.7:*:*:*:*:*:*:*
ruby-lang ruby 2.3.0 cpe:2.3:a:ruby-lang:ruby:2.3.0:*:*:*:*:*:*:*
ruby-lang ruby 2.3.0 cpe:2.3:a:ruby-lang:ruby:2.3.0:preview1:*:*:*:*:*:*
ruby-lang ruby 2.3.0 cpe:2.3:a:ruby-lang:ruby:2.3.0:preview2:*:*:*:*:*:*
ruby-lang ruby 2.3.1 cpe:2.3:a:ruby-lang:ruby:2.3.1:*:*:*:*:*:*:*
ruby-lang ruby 2.3.2 cpe:2.3:a:ruby-lang:ruby:2.3.2:*:*:*:*:*:*:*
ruby-lang ruby 2.3.3 cpe:2.3:a:ruby-lang:ruby:2.3.3:*:*:*:*:*:*:*
ruby-lang ruby 2.3.4 cpe:2.3:a:ruby-lang:ruby:2.3.4:*:*:*:*:*:*:*
ruby-lang ruby 2.4.0 cpe:2.3:a:ruby-lang:ruby:2.4.0:*:*:*:*:*:*:*
ruby-lang ruby 2.4.0 cpe:2.3:a:ruby-lang:ruby:2.4.0:preview1:*:*:*:*:*:*
ruby-lang ruby 2.4.0 cpe:2.3:a:ruby-lang:ruby:2.4.0:preview2:*:*:*:*:*:*
ruby-lang ruby 2.4.0 cpe:2.3:a:ruby-lang:ruby:2.4.0:preview3:*:*:*:*:*:*
ruby-lang ruby 2.4.0 cpe:2.3:a:ruby-lang:ruby:2.4.0:rc1:*:*:*:*:*:*
ruby-lang ruby 2.4.1 cpe:2.3:a:ruby-lang:ruby:2.4.1:*:*:*:*:*:*:*

References for CVE-2017-14033

URL Tags
http://www.securityfocus.com/bid/100868 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1039363 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1042004
https://access.redhat.com/errata/RHSA-2018:0378
https://access.redhat.com/errata/RHSA-2018:0583
https://access.redhat.com/errata/RHSA-2018:0585
https://lists.debian.org/debian-lts-announce/2018/07/msg00012.html
https://security.gentoo.org/glsa/201710-18
https://www.debian.org/security/2017/dsa-4031
https://www.ruby-lang.org/en/news/2017/09/14/openssl-asn1-buffer-underrun-cve-2017-14033/ Mitigation Vendor Advisory
https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-2-8-released/ Patch Release Notes Vendor Advisory
https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-3-5-released/ Patch Release Notes Vendor Advisory
cvelogic Threat Intelligence