Attestkeep
Language: English
Sign up

Vulnerabilities / CVE-2021-41556

critical

CVE-2021-41556

sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an ou ...

Published Modified CWE 125
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD10.0CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Ubuntu (medium).

Description

sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that can lead to Code Execution. If a victim executes an attacker-controlled squirrel script, it is possible for the attacker to break out of the squirrel script sandbox even if all dangerous functionality such as File System functions has been disabled. An attacker might abuse this bug to target (for example) Cloud services that allow customization via SquirrelScripts, or distribute malware through video games that embed a Squirrel Engine.

Affected packages and fixed versions

SourcePackageFixed in
debian 10squirrel3no fix listed
debian 11squirrel3no fix listed
debian 13squirrel33.1-8.2+deb13u1
debian 14squirrel33.1-8.5
echosquirrel33.1-8.2+deb13u1
rapidfort debian 12squirrel30:3.1-8.2+deb13u1, 0:3.1-8.5
rapidfort debian 13squirrel30:3.1-8.2+deb13u1, 0:3.1-8.5
ubuntu 18.04-ESMsquirrel3no fix listed

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.