CVE-2017-14033

CVE-2017-14033 is a high-severity vulnerability in Ruby-lang Ruby with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-119.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• CVSS v2: 5.0
• EPSS exploit prediction: 8% (94th percentile)
• Actively exploited: Not listed in CISA KEV
• Weakness: CWE-119
• Affected product: Ruby-lang Ruby
• Published: 2017-09-19
• Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is 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.

How severe is CVE-2017-14033?

CVE-2017-14033 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-14033 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-14033?

CVE-2017-14033 primarily affects Ruby-lang Ruby. In total, 24 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2017-14033?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2017-14033 published?

CVE-2017-14033 was published on 2017-09-19 and last updated on 2026-06-17.

References

• http://www.securityfocus.com/bid/100868
• http://www.securitytracker.com/id/1039363
• 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/
• https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-2-8-released/
• https://www.ruby-lang.org/en/news/2017/09/14/ruby-2-3-5-released/

Affected products (24)

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

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