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Fencer Vulns
high 8.0

CVE-2021-32819 in the critical feed json

Remote code execution in squirrelly

published 2021-05-14 5 y ago modified 2026-06-17 4 mo ago also GHSA-q8j6-pwqx-pm96 , EUVD-2021-1163

cvss
8.0
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
58.3%
EPSS 58.3% chance of exploitation in 30 days, percentile 99.1%
public exploits
0
none known, plus a Nuclei check

Summary

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.

Patch / fix

  • npm squirrelly 9.0.0

Exploit prediction

58.29% chance of exploitation in the next 30 days, higher than 99.1% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • Nuclei template Nodejs Squirrelly - Remote Code Execution nuclei detection template
  • securitylab.github.com https://securitylab.github.com/advisories/GHSL-2021-023-squirrelly/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P
GitHub 3.1 8.0 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected packages

ecosystem package affected fixed in
npm squirrelly
<9.0.0
9.0.0

Affected products

  • squirrellyjs squirrelly

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.