Vulnerability Details : CVE-2021-44686
Potential exploit
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.
Vulnerability category: Denial of service
Products affected by CVE-2021-44686
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:a:calibre-ebook:calibre:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-44686
0.88%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 74 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-44686
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:N/A:P |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
3.9
|
3.6
|
NIST |
CWE ids for CVE-2021-44686
-
The product does not properly control the allocation and maintenance of a limited resource.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-44686
-
https://github.com/kovidgoyal/calibre/compare/v5.31.1...v5.32.0
Comparing v5.31.1...v5.32.0 · kovidgoyal/calibre · GitHubPatch;Third Party Advisory
-
https://bugs.launchpad.net/calibre/+bug/1951979
Bug #1951979 “calibre contains a regular expression that is vuln...” : Bugs : calibreExploit;Issue Tracking;Vendor Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/W7QKFPYJ23KG6WJ5NIYAM4N2NWZCLQGL/
[SECURITY] Fedora 34 Update: calibre-4.23.0-8.fc34 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://github.com/dwisiswant0/advisory/issues/18
ReDoS in calibre · Issue #18 · dwisiswant0/advisory · GitHubExploit;Issue Tracking;Patch;Third Party Advisory
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