Is cgi affected by CVE-2021-41819?

RubyGems cgi is affected in >=0.3.0 =0.2.0 <0.2.1, <0.1.0.1.

Is CVE-2021-41819 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 2.9%.

high

CVE-2021-41819

Q: Is CVE-2021-41819 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 2.9%.

RubyGems · cgi

Summary

Cookie Prefix Spoofing in CGI::Cookie.parse

Severity: high
EPSS: 2.9% (p85)
Also known as: GHSA-4vf4-qmvg-mh7h, BIT-ruby-2021-41819, BIT-ruby-min-2021-41819
Published: 2022-01-21

References

https://nvd.nist.gov/vuln/detail/CVE-2021-41819
https://hackerone.com/reports/910552
https://github.com/ruby/cgi

Related advisories

CVE-2021-41816 — critical · RubyGems/cgi
CVE-2021-33621 — high · RubyGems/cgi
CVE-2025-27220 — medium · RubyGems/cgi
CVE-2025-27219 — medium · RubyGems/cgi

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.