CVE-2021-44686
Calibre ReDoS Vulnerability
Description
calibre before 5.32.0 contains a regular expression that is vulnerable to ReDoS (Regular Expression Denial of Service) in html_preprocess_rules in ebooks/conversion/preprocess.py.
INFO
Published Date :
Dec. 7, 2021, 12:15 a.m.
Last Modified :
Nov. 7, 2023, 3:39 a.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
3.9
Public PoC/Exploit Available at Github
CVE-2021-44686 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-2021-44686.
| URL | Resource |
|---|---|
| https://bugs.launchpad.net/calibre/+bug/1951979 | Exploit Issue Tracking Vendor Advisory |
| https://github.com/dwisiswant0/advisory/issues/18 | Exploit Issue Tracking Patch Third Party Advisory |
| https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0 | Patch Third Party Advisory |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/ |
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).
List of RegEx DoS (ReDoS) CVEs and resources
security awesome redos regex dos regex-dos pentesting awesome-list regex-security
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-44686 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-44686 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/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/ [No types assigned] Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/ -
CWE Remap by [email protected]
May. 03, 2022
Action Type Old Value New Value Changed CWE CWE-770 CWE-400 -
Modified Analysis by [email protected]
Jan. 04, 2022
Action Type Old Value New Value Changed Reference Type https://bugs.launchpad.net/calibre/+bug/1951979 Exploit, Vendor Advisory https://bugs.launchpad.net/calibre/+bug/1951979 Exploit, Issue Tracking, Vendor Advisory Changed Reference Type https://github.com/dwisiswant0/advisory/issues/18 Exploit, Third Party Advisory https://github.com/dwisiswant0/advisory/issues/18 Exploit, Issue Tracking, Patch, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/ Mailing List, Third Party Advisory Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Dec. 22, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/ [No Types Assigned] -
Initial Analysis by [email protected]
Dec. 07, 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://bugs.launchpad.net/calibre/+bug/1951979 No Types Assigned https://bugs.launchpad.net/calibre/+bug/1951979 Exploit, Vendor Advisory Changed Reference Type https://github.com/dwisiswant0/advisory/issues/18 No Types Assigned https://github.com/dwisiswant0/advisory/issues/18 Exploit, Third Party Advisory Changed Reference Type https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0 No Types Assigned https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0 Patch, Third Party Advisory Added CWE NIST CWE-770 Added CPE Configuration OR *cpe:2.3:a:calibre-ebook:calibre:*:*:*:*:*:*:*:* versions up to (excluding) 5.32.0
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-44686 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-2021-44686
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.24 }} 0.03%
score
0.62190
percentile