What is CVE-2017-14033?

CVE-2017-14033 is a high-severity vulnerability in Ruby-Lang Ruby, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2017-09-19.

How severe is CVE-2017-14033?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2017-14033 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Ruby-Lang Ruby

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.

Vulnerability class: Buffer Overflow

Published 2017-09-19 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.077 (94.4th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 94th percentile — 94.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.077 · newest: 0.077 · change: 0.000

Affected products

Ruby-Lang Ruby — versions 2.2.0, 2.2.1, 2.2.2

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

Public proof-of-concept exploits

References

access.redhat.com/errata/RHSA-2018:0585 (vendor-advisory)
www.ruby-lang.org/en/news/2017/09/14/ruby-2-3-5-released/ (Patch, Release Notes, Vendor Advisory)
access.redhat.com/errata/RHSA-2018:0378 (vendor-advisory)
www.securitytracker.com/id/1042004 (vdb-entry)
www.debian.org/security/2017/dsa-4031 (vendor-advisory)
www.ruby-lang.org/en/news/2017/09/14/ruby-2-2-8-released/ (Patch, Release Notes, Vendor Advisory)
www.securitytracker.com/id/1039363 (VDB Entry, Third Party Advisory, vdb-entry)
lists.debian.org/debian-lts-announce/2018/07/msg00012.html (mailing-list)
access.redhat.com/errata/RHSA-2018:0583 (vendor-advisory)
www.ruby-lang.org/en/news/2017/09/14/openssl-asn1-buffer-underrun-cve-2017-1403… (Mitigation, Vendor Advisory)

Frequently asked questions

What is CVE-2017-14033?: CVE-2017-14033 is a high-severity vulnerability in Ruby-Lang Ruby, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 7.5/10. Published 2017-09-19.
How severe is CVE-2017-14033?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2017-14033 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.