Integer overflow in Ruby-lang Cgi
CVE-2021-41816
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 C…
Vulnerability class: Integer Overflow
EPSS: 0.048 (90.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Ruby-lang Cgi
- Ruby-lang Ruby
- Fedoraproject Fedora — versions 34, 35
- N/a — versions n/a
Weakness classification (CWE)
Public proof-of-concept exploits
References
- cve@mitre.org (Permissions Required, Third Party Advisory)
- cve@mitre.org (Exploit, Vendor Advisory)
- cve@mitre.org (Third Party Advisory)
- cve@mitre.org (Third Party Advisory)
- cve@mitre.org (vendor-advisory)
- cve@mitre.org (vendor-advisory)
- cve@mitre.org (vendor-advisory)
Frequently asked questions
- What is CVE-2021-41816?
- CVE-2021-41816 is a critical-severity vulnerability in Ruby-lang Cgi, classified under Integer Overflow or Wraparound. CVSS score: 9.8/10. Published 2022-02-06.
- How severe is CVE-2021-41816?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2021-41816 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.