high
7.5
CWE
1333 400
Advisory Published
Advisory Published
CVE Published
Updated

CVE-2021-41817

First published: Mon Nov 15 2021(Updated: )

A flaw was found in ruby, where the date object was found to be vulnerable to a regular expression denial of service (ReDoS) during the parsing of dates. This flaw allows an attacker to hang a ruby application by providing a specially crafted date string. The highest threat to this vulnerability is system availability.

Credit: cve@mitre.org cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/rh-ruby26-ruby<0:2.6.9-120.el7
0:2.6.9-120.el7
redhat/rh-ruby30-ruby<0:3.0.4-149.el7
0:3.0.4-149.el7
redhat/rh-ruby27-ruby<0:2.7.6-131.el7
0:2.7.6-131.el7
redhat/ruby-date<3.2.1
3.2.1
redhat/ruby-date<3.1.2
3.1.2
redhat/ruby-date<3.0.2
3.0.2
redhat/ruby-date<2.0.1
2.0.1
redhat/ruby<3.0.3
3.0.3
redhat/ruby<2.7.5
2.7.5
redhat/ruby<2.6.9
2.6.9
rubygems/date<2.0.1
2.0.1
rubygems/date>=3.0.0<3.0.2
3.0.2
rubygems/date>=3.1.0<3.1.2
3.1.2
rubygems/date>=3.2.0<3.2.1
3.2.1
Ruby<2.0.1
Ruby>=3.0.0<3.0.2
Ruby>=3.1.0<3.1.2
Ruby=3.2.0
Ruby>=2.6.0<2.6.9
Ruby>=2.7.0<2.7.5
Ruby>=3.0.0<3.0.3
redhat software collections
Red Hat Enterprise Linux=7.0
Red Hat Enterprise Linux=8.0
Fedora=34
Fedora=35
Debian=9.0
Debian=10.0
Debian=11.0
SUSE Linux Enterprise Server=12.0
SUSE Linux Enterprise Server=15.0
openSUSE
openSUSE=15.2

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-41817?

    CVE-2021-41817 is a vulnerability in the date parsing method of the Ruby date gem that allows for regular expression Denial of Service (ReDoS) attacks.

  • What is the severity of CVE-2021-41817?

    CVE-2021-41817 has a severity rating of 7.5 (high).

  • How does CVE-2021-41817 affect Ruby applications?

    CVE-2021-41817 allows an attacker to hang a Ruby application by providing a specially crafted date string.

  • Which versions of the Ruby date gem are affected by CVE-2021-41817?

    Versions up to and including 3.2.0 of the Ruby date gem are affected by CVE-2021-41817.

  • How can I fix CVE-2021-41817?

    To fix CVE-2021-41817, update the Ruby date gem to version 3.2.1 or later.

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