CVE-2021-3820

Name: CVE-2021-3820
Creator: NVD / NIST
Published: 2021-09-27T13:15:07.887+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.18%

Last modified Jun 17, 2026

CVE-2021-3820 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. inflect is vulnerable to Inefficient Regular Expression Complexity. EPSS estimates a 1.18% chance of exploitation in the next 30 days.

Description

inflect is vulnerable to Inefficient Regular Expression Complexity

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.18%

63.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-1333

Affected Software

Vendor	Product	Versions
Inflect Project	Inflect	< 0.3.7

References

https://github.com/pksunkara/inflect/commit/a9a0a8e9561c3487854c7cae42565d9652ec858bPatch, Third Party Advisory
https://huntr.dev/bounties/4612b31a-072b-4f61-a916-c7e4cbc2042aExploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/pksunkara/inflect/commit/a9a0a8e9561c3487854c7cae42565d9652ec858bPatch, Third Party Advisory
https://huntr.dev/bounties/4612b31a-072b-4f61-a916-c7e4cbc2042aExploit, Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Sep 27, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-3820?

inflect is vulnerable to Inefficient Regular Expression Complexity

How severe is CVE-2021-3820?

CVE-2021-3820 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-3820?

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.

Are you affected by CVE-2021-3820?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST