What is the CVSS score of CVE-2021-44686?

CVE-2021-44686 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 5.0%.

Is there a public PoC exploit available for CVE-2021-44686?

Yes, a public proof-of-concept exploit is available for CVE-2021-44686. Prioritise patching immediately. EPSS: 5.0%.

Is there a patch available for CVE-2021-44686?

Yes, a patch is available for CVE-2021-44686. Update the affected software to the latest version immediately.

Calibre CVE-2021-44686

HIGH

Uncontrolled Resource Consumption (CWE-400)

2021-12-07 cve@mitre.org

Denial Of Service Calibre Fedora

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

CVE Published

Dec 07, 2021 - 00:15 nvd

HIGH 7.5

DescriptionNVD

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.

AnalysisAI

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. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Uncontrolled Resource Consumption (CWE-400), which allows attackers to cause denial of service by exhausting system resources. 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. Affected products include: Calibre-Ebook Calibre, Fedoraproject Fedora. Version information: before 5.32.0.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Implement rate limiting, set resource quotas, validate input sizes, use timeouts.