CVE-2021-32819Public exploitNetwork attack vector

Remote code execution via configuration option injection

Published May 14, 2021 · Updated Aug 3, 2024

Remote code execution in Squirrelly before 9.0.0 allows remote attackers to execute JavaScript through malicious Express render data. The renderFile path passes the Express data object into getConfig, allowing attacker-controlled autoEscape and defaultFilter values to enter generated template code. Exploitation requires a downstream application to pass user-controlled data, such as req.query, directly to res.render and runs code in the Node process.

CVSS severity8.0
High
EPSS probability58.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Squirrelly before 9.0.0 allows remote attackers to execute JavaScript through malicious Express render data. The renderFile path passes the Express data object into getConfig, allowing attacker-controlled autoEscape and defaultFilter values to enter generated template code. Exploitation requires a downstream application to pass user-controlled data, such as req.query, directly to res.render and runs code in the Node process.

The record

CVE
CVE-2021-32819
Published
May 14, 2021
Updated
Aug 3, 2024
Vendor
Squirrelly
Product
Squirrelly
Classifications
CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 14, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=9.0.0 <9.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Squirrelly · Squirrellyversion=9.0.0 <9.0.0

Published CVSS scores

8.0GitHub CNACVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8NVDAV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Information Exposure
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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