CVE-2021-41816
CRITICALCGI < 0.3.1 - Integer Overflow via Long String in escape_html
Title source: llmDescription
CGI.escape_html in Ruby before 2.7.5 and 3.x before 3.0.3 has an integer overflow and resultant buffer overflow via a long string on platforms (such as Windows) where size_t and long have different numbers of bytes. This also affects the CGI gem before 0.3.1 for Ruby.
References (7)
Core 7
Core References
Mailing List, Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IUXQCH6FRKANCVZO2Q7D2SQX33FP3KWN/
Mailing List, Third Party Advisory vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UTOJGS5IEFDK3UOO7IY4OTTFGHGLSWZF/
Third Party Advisory vendor-advisory
https://security.gentoo.org/glsa/202401-27
Permissions Required, Third Party Advisory
https://hackerone.com/reports/1328463
Third Party Advisory
https://security-tracker.debian.org/tracker/CVE-2021-41816
Third Party Advisory
https://security.netapp.com/advisory/ntap-20220303-0006/
Exploit, Vendor Advisory
https://www.ruby-lang.org/en/news/2021/11/24/buffer-overrun-in-cgi-escape_html-cve-2021-41816/
Scores
CVSS v3
9.8
EPSS
0.0050
EPSS Percentile
66.0%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Details
CWE
CWE-190
Status
published
Products (4)
fedoraproject/fedora
34
fedoraproject/fedora
35
ruby-lang/cgi
< 0.3.1
rubygems/cgi
0.3.0 - 0.3.1RubyGems
Published
Feb 06, 2022
Tracked Since
Feb 18, 2026