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7.5
HIGH CVSS 3.1
CVE-2021-3820
Inefficient Regular Expression Complexity in pksunkara/inflect
Description

inflect is vulnerable to Inefficient Regular Expression Complexity

INFO

Published Date :

Sept. 27, 2021, 1:15 p.m.

Last Modified :

Nov. 21, 2024, 6:22 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2021-3820 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Inflect_project inflect
: Total Affected Vendor : 1 | Products : 1
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 MEDIUM [email protected]
CVSS 3.0 MEDIUM [email protected]
CVSS 3.1 HIGH [email protected]
Solution
This information is provided by the 3rd party feeds.
  • Upgrade the linux packages. For Debian 9 stretch, these problems have been fixed in version 4.9.290-1.
Public PoC/Exploit Available at Github

CVE-2021-3820 has a 1 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-3820.

URL Resource
https://github.com/pksunkara/inflect/commit/a9a0a8e9561c3487854c7cae42565d9652ec858b Patch Third Party Advisory
https://huntr.dev/bounties/4612b31a-072b-4f61-a916-c7e4cbc2042a Exploit Issue Tracking Patch Third Party Advisory
https://github.com/pksunkara/inflect/commit/a9a0a8e9561c3487854c7cae42565d9652ec858b Patch Third Party Advisory
https://huntr.dev/bounties/4612b31a-072b-4f61-a916-c7e4cbc2042a Exploit Issue Tracking Patch Third Party Advisory
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-3820 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-3820 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
javiermorales36/inflect

None

Python

Updated: 2 weeks, 6 days ago
0 stars 0 fork 0 watcher
Born at : Oct. 11, 2025, 5:28 p.m. This repo has been linked 1 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-3820 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2021-3820 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://github.com/pksunkara/inflect/commit/a9a0a8e9561c3487854c7cae42565d9652ec858b
    Added Reference https://huntr.dev/bounties/4612b31a-072b-4f61-a916-c7e4cbc2042a
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Modified Analysis by [email protected]

    Jul. 29, 2022

    Action Type Old Value New Value
    Removed CWE NIST CWE-400
    Added CWE NIST NVD-CWE-Other
    Changed CPE Configuration OR *cpe:2.3:a:inflect_project:inflect:*:*:*:*:*:*:*:* versions up to (including) 0.3.6 OR *cpe:2.3:a:inflect_project:inflect:*:*:*:*:*:node.js:*:* versions up to (excluding) 0.3.7
  • CVE Modified by [email protected]

    May. 12, 2022

    Action Type Old Value New Value
    Added CWE huntr.dev CWE-1333
  • CWE Remap by [email protected]

    May. 03, 2022

    Action Type Old Value New Value
    Changed CWE CWE-697 CWE-400
  • Initial Analysis by [email protected]

    Oct. 01, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
    Changed Reference Type https://github.com/pksunkara/inflect/commit/a9a0a8e9561c3487854c7cae42565d9652ec858b No Types Assigned https://github.com/pksunkara/inflect/commit/a9a0a8e9561c3487854c7cae42565d9652ec858b Patch, Third Party Advisory
    Changed Reference Type https://huntr.dev/bounties/4612b31a-072b-4f61-a916-c7e4cbc2042a No Types Assigned https://huntr.dev/bounties/4612b31a-072b-4f61-a916-c7e4cbc2042a Exploit, Issue Tracking, Patch, Third Party Advisory
    Added CWE NIST CWE-697
    Added CPE Configuration OR *cpe:2.3:a:inflect_project:inflect:*:*:*:*:*:*:*:* versions up to (including) 0.3.6
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 7.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 5.3
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 5
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.28 }} -0.05%

score

0.48469

percentile