CVE-2021-32819

Remote code execution in squirrelly

CVSS 3.1 High 8.0

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

Description

Squirrelly is a template engine implemented in JavaScript that works out of the box with ExpressJS. Squirrelly mixes pure template data with engine configuration options through the Express render API. By overwriting internal configuration options remote code execution may be triggered in downstream applications. This issue is fixed in version 9.0.0. For complete details refer to the referenced GHSL-2021-023.

Key data

CVSS 3.1 High 8.0

Score published by GitHub_M in the CVE record.

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

Attack vector: Network
The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity: High
The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required: None
No account or privileges are needed.
User interaction: Required
A user has to do something first, such as opening a file or following a link.
Scope: Changed
The impact can reach other components beyond the vulnerable one.
Confidentiality impact: High
Serious or total effect on the secrecy of data.
Integrity impact: High
Serious or total effect on the trustworthiness of data.
Availability impact: None
No effect on availability.

Metric	Value	What it means
Attack vector	Network	The vulnerable component can be reached over a network, possibly from the Internet.
Attack complexity	High	The attack depends on conditions outside the attacker's control, so it takes preparation.
Privileges required	None	No account or privileges are needed.
User interaction	Required	A user has to do something first, such as opening a file or following a link.
Scope	Changed	The impact can reach other components beyond the vulnerable one.
Confidentiality impact	High	Serious or total effect on the secrecy of data.
Integrity impact	High	Serious or total effect on the trustworthiness of data.
Availability impact	None	No effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score: 0.58286 (58.3% probability)
Percentile: 99.1%
Scores of: Nov 10, 2026
Model: v2026.06.15

Weakness (CWE)

CWE catalog version 5.0.

CWE-200Exposure of Sensitive Information to an Unauthorized Actor

Affected products

Products listed in the CVE record, as the CNA published them.

squirrellyjs squirrelly
- affected: 9.0.0 up to before 9.0.0

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

ID reservedMay 12, 2021
Record publishedMay 14, 2021
Record last updatedAug 3, 2024

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:52 UTC. Sources and licenses