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Exploitation reportedNot in CISA KEV yetFix available

CVE-2021-32819

Exploitation reported by one source. First attested on 2024-02-07 by GCVE · shadowserver.

  • Published2021-05-14
  • WeaknessCWE-200

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-05-1419:15CVE publishedNVD
  2. 2024-02-0714:34Listed as exploited by GCVEGCVE
  3. 2024-02-0714:34Exploitation first reportedGCVE

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-32819?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-32819?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV
Squirrelly
BranchAffectedFixed in
8.0= 8.0.8no fix published
squirrelly
BranchAffectedFixed in
9.0< 9.0.09.0.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
1 repository, unverifiedAbady0x1/CVE-2021-32819
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2021-05-14
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-q8j6-pwqx-pm96

Frequently asked questions

What is CVE-2021-32819?

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.

Is CVE-2021-32819 actively exploited?

Active exploitation of CVE-2021-32819 has not been confirmed. Its EPSS score was 58.3% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-32819?

CVE-2021-32819 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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