CVE-2021-27945: The Squirro Insights Engine was affected by a Reflected Cross-Site Scripting (XSS) vulnerability affecting ver

Routine

MEDIUM 6.1UPGRADE

CVE-2021-27945 is a medium-severity flaw (CVSS 6.1) affecting squirro. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Squirro Insights Engine was affected by a Reflected Cross-Site Scripting (XSS) vulnerability affecting versions 2.0.0 up to and including 3.2.4. An attacker can use the vulnerability to inject malicious JavaScript code into the application, which will execute within the browser of any user who views the relevant application content. The attacker-supplied code can perform a wide variety of actions, such as stealing victims' session tokens or l

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-04-08
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: squirro

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-04-08 17:15 UTCPublished CVE record published
2026-06-17 03:45 UTCUpdated Record last modified

squirro squirro UPGRADE

Affected: >= 2.0.0 and <= 3.2.4

Fixed in: newer than 3.2.4

Safe to downgrade to: a release before 2.0.0

1. Check installed version

apt-cache policy squirro || rpm -q squirro || squirro --version

2. UPGRADE to newer than 3.2.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade squirro

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade squirro

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2.0.0 (Debian / Ubuntu)

apt-cache madison squirro sudo apt install squirro=<VERSION_BEFORE_2.0.0> sudo apt-mark hold squirro

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list squirro sudo dnf downgrade squirro-<VERSION_BEFORE_2.0.0> sudo dnf versionlock add squirro

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-27945?

squirro: upgrade to newer than 3.2.4. Exact commands for each OS are on this page.

Is CVE-2021-27945 being exploited?

CVE-2021-27945 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-27945 affect?

CVE-2021-27945 affects squirro. Severity is medium (CVSS 6.1). The Squirro Insights Engine was affected by a Reflected Cross-Site Scripting (XSS) vulnerability affecting versions 2.0.0 up to and including 3.2.4. An attacker can use the vulnerability to inject malicious JavaScript code into the applicat

How urgent is CVE-2021-27945?

Priority 35/100. No elevated risk signals yet.

References

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