Security readout for executives and security teams
CVE-2021-41556 affects the Squirrel scripting engine. A malicious Squirrel script could escape intended sandbox limits and potentially execute code, even when risky functions such as filesystem access are disabled. The main business risk is in products or services that let users, customers, or content packages run Squirrel scripts. Exposure is most likely where Squirrel is embedded and untrusted or semi-trusted scripts are accepted, including customization platforms, plugins, mods, or games. The bundle does not identify specific affected vendors beyond Squirrel versions. Prioritize remediation where Squirrel processes user-controlled scripts or third-party content. The CVSS score is critical, but business urgency depends on whether attackers can supply scripts to your environment. Mitigation focus: Inventory products and services that embed Squirrel or accept Squirrel scripts.; Upgrade to Squirrel code or packages containing the upstream fix commit.; Apply relevant Fedora or vendor package updates where applicable..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
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ATT&CK lookup starting points
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CWE-125: Exact CWE lookup
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Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-41556 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 10 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H3.96CISA-ADPVulnerability scoring details
Base CVSS 3.1 score
10CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/albertodemichelis/squirrel/commit/23a0620658714b996d20da3d4dd1a0dcf9b0bd98CVE reference, mitre · x_refsource_MISC
- https://blog.sonarsource.com/squirrel-vm-sandbox-escape/CVE reference, mitre · x_refsource_MISC
- FEDORA-2022-e81c0db364CVE reference, mitre · vendor-advisory, x_refsource_FEDORA
- FEDORA-2022-e139f256f6CVE reference, mitre · vendor-advisory, x_refsource_FEDORA
- https://www.sonarsource.com/blog/squirrel-vm-sandbox-escape/CVE reference, CISA-ADP · exploit
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Out-of-bounds Read
Out-of-bounds Read represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.