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CVE-2021-33621

HIGHCVSS 8.8/10EPSS 2.29%

Last modified

CVE-2021-33621 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. This is relevant to applications that use untrusted user input either to generate an HTTP response or to create a CGI::Cookie object.. EPSS estimates a 2.29% chance of exploitation in the next 30 days.

Description

The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. This is relevant to applications that use untrusted user input either to generate an HTTP response or to create a CGI::Cookie object.

Metrics

CVSS 3.1
8.8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
2.29%

81.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
Ruby-LangCgi< 0.1.0.2
Ruby-LangCgi>= 0.2.0, < 0.2.2
Ruby-LangCgi>= 0.3.0, < 0.3.5
FedoraprojectFedora35
FedoraprojectFedora36
FedoraprojectFedora37
Ruby-LangRuby>= 2.7.0, < 2.7.7
Ruby-LangRuby>= 3.0.0, < 3.0.5
Ruby-LangRuby>= 3.1.0, < 3.1.3

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-33621?
The cgi gem before 0.1.0.2, 0.2.x before 0.2.2, and 0.3.x before 0.3.5 for Ruby allows HTTP response splitting. This is relevant to applications that use untrusted user input either to generate an HTTP response or to create a CGI::Cookie object.
How severe is CVE-2021-33621?
CVE-2021-33621 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 2.29% probability of exploitation in the next 30 days.
How do I fix CVE-2021-33621?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST