CVE-2021-27291
Apache Pygments Regular Expression Denial of Service (ReDoS) vulnerability
Description
In pygments 1.1+, fixed in 2.7.4, the lexers used to parse programming languages rely heavily on regular expressions. Some of the regular expressions have exponential or cubic worst-case complexity and are vulnerable to ReDoS. By crafting malicious input, an attacker can cause a denial of service.
INFO
Published Date :
March 17, 2021, 1:15 p.m.
Last Modified :
Nov. 7, 2023, 3:31 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-27291 has a 5 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
Affected Products
The following products are affected by CVE-2021-27291
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.
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-2021-27291.
| URL | Resource |
|---|---|
| https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce | Exploit Third Party Advisory |
| https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14 | Patch Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html | Mailing List Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html | Mailing List Third Party Advisory |
| https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html | Mailing List Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/ | |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/ | |
| https://www.debian.org/security/2021/dsa-4878 | Third Party Advisory |
| https://www.debian.org/security/2021/dsa-4889 | Third Party Advisory |
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).
None
CMake Shell Perl C++ C Batchfile CSS Makefile M4 Python
None
Python JavaScript C#
None
List of RegEx DoS (ReDoS) CVEs and resources
security awesome redos regex dos regex-dos pentesting awesome-list regex-security
Find regular expressions which are vulnerable to ReDoS (Regular Expression Denial of Service)
Python JavaScript C#
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-27291 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-27291 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 [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/ [No types assigned] Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/ [No types assigned] Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/ Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/ -
CWE Remap by [email protected]
Aug. 08, 2023
Action Type Old Value New Value Changed CWE NVD-CWE-Other CWE-1333 -
Modified Analysis by [email protected]
May. 23, 2022
Action Type Old Value New Value Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html Mailing List, Third Party Advisory Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/ Mailing List, Third Party Advisory Changed Reference Type https://www.debian.org/security/2021/dsa-4878 No Types Assigned https://www.debian.org/security/2021/dsa-4878 Third Party Advisory Changed Reference Type https://www.debian.org/security/2021/dsa-4889 No Types Assigned https://www.debian.org/security/2021/dsa-4889 Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* -
CVE Modified by [email protected]
May. 06, 2021
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2021/05/msg00006.html [No Types Assigned] -
CVE Modified by [email protected]
May. 06, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/WSLD67LFGXOX2K5YNESSWAS4AGZIJTUQ/ [No Types Assigned] Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/GSJRFHALQ7E3UV4FFMFU2YQ6LUDHAI55/ [No Types Assigned] -
CVE Modified by [email protected]
May. 05, 2021
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2021/05/msg00003.html [No Types Assigned] -
CVE Modified by [email protected]
Apr. 11, 2021
Action Type Old Value New Value Added Reference https://www.debian.org/security/2021/dsa-4889 [No Types Assigned] -
CVE Modified by [email protected]
Mar. 30, 2021
Action Type Old Value New Value Added Reference https://www.debian.org/security/2021/dsa-4878 [No Types Assigned] -
Initial Analysis by [email protected]
Mar. 24, 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://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce No Types Assigned https://gist.github.com/b-c-ds/b1a2cc0c68a35c57188575eb496de5ce Exploit, Third Party Advisory Changed Reference Type https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14 No Types Assigned https://github.com/pygments/pygments/commit/2e7e8c4a7b318f4032493773732754e418279a14 Patch, Third Party Advisory Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html Mailing List, Third Party Advisory Added CWE NIST NVD-CWE-Other Added CPE Configuration OR *cpe:2.3:a:pygments:pygments:*:*:*:*:*:*:*:* versions from (including) 1.1 up to (excluding) 2.7.4 -
CVE Modified by [email protected]
Mar. 19, 2021
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2021/03/msg00024.html [No Types Assigned]
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-27291 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-2021-27291
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.96 }} 0.28%
score
0.81600
percentile