critical
9.8
CWE
119 190
Advisory Published
Advisory Published
CVE Published
Updated

CVE-2021-41816: Buffer Overflow

First published: Wed Nov 24 2021(Updated: )

A buffer overrun vulnerability was discovered in CGI.escape_html. This can lead to a buffer overflow when a user passes a very large string (> 700 MB) to CGI.escape_html on a platform where long type takes 4 bytes, typically, Windows.

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

Affected SoftwareAffected VersionHow to fix
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
Ruby-lang Cgi<0.3.1
Ruby-lang Cgi<=0.2.0
Ruby-lang Ruby>=3.0.0<3.0.3
Ruby-lang Cgi<=0.1.0
Ruby-lang Ruby>=2.7.0<2.7.5
Fedoraproject Fedora=34
Fedoraproject Fedora=35
All of
Ruby-lang Ruby>=3.0.0<3.0.3
Ruby-lang Cgi<=0.2.0
All of
Ruby-lang Ruby>=2.7.0<2.7.5
Ruby-lang Cgi<=0.1.0
rubygems/cgi<0.1.0.1
0.1.0.1
rubygems/cgi>=0.2.0<0.2.1
0.2.1
rubygems/cgi>=0.3.0<0.3.1
0.3.1
debian/ruby2.7
2.7.4-1+deb11u1

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2021-41816?

    CVE-2021-41816 is a buffer overrun vulnerability in CGI.escape_html in Ruby before 2.7.5 and 3.x before 3.0.3.

  • How severe is CVE-2021-41816?

    CVE-2021-41816 has a severity rating of 9.8, which is considered critical.

  • Which software versions are affected by CVE-2021-41816?

    CGI.escape_html in Ruby versions before 2.7.5 and 3.x before 3.0.3 are affected.

  • How can I fix CVE-2021-41816?

    To fix CVE-2021-41816, upgrade to Ruby version 2.7.5 or 3.0.3, or apply the appropriate remedy provided by the software vendor.

  • Where can I find more information about CVE-2021-41816?

    You can find more information about CVE-2021-41816 in the references section of the vulnerability report.

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