What is the CVSS score of CVE-2021-40531?

CVE-2021-40531 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 32.8%.

Is there a public PoC exploit available for CVE-2021-40531?

Yes, a public proof-of-concept exploit is available for CVE-2021-40531. Prioritise patching immediately. EPSS: 32.8%.

Is there a patch available for CVE-2021-40531?

Yes, a patch is available for CVE-2021-40531. Update the affected software to the latest version immediately.

Sketch CVE-2021-40531

CRITICAL

Unrestricted Upload of File with Dangerous Type (CWE-434)

2021-09-06 cve@mitre.org

Apple RCE File Upload Sketch

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

CVE Published

Sep 06, 2021 - 21:15 nvd

CRITICAL 9.8

DescriptionNVD

Sketch before 75 allows library feeds to be used to bypass file quarantine. Files are automatically downloaded and opened, without the com.apple.quarantine extended attribute. This results in remote code execution, as demonstrated by CommandString in a terminal profile to Terminal.app.

AnalysisAI

Sketch before 75 allows library feeds to be used to bypass file quarantine. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Unrestricted File Upload (CWE-434), which allows attackers to upload malicious files that can be executed on the server. Sketch before 75 allows library feeds to be used to bypass file quarantine. Files are automatically downloaded and opened, without the com.apple.quarantine extended attribute. This results in remote code execution, as demonstrated by CommandString in a terminal profile to Terminal.app. Affected products include: Sketch. Version information: before 75.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate file types server-side, store uploads outside webroot, use random filenames, scan for malware.