CVE-2021-44255: Authenticated remote code execution in MotionEye <= 0.42.1 and MotioneEyeOS <= 20200606 allows a remote attack

Q: How do I fix CVE-2021-44255?

motioneye: upgrade to 0.42.1; motioneyeos: upgrade to 20200606. Exact commands for each OS are on this page.

Q: Is CVE-2021-44255 being exploited?

CVE-2021-44255 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-44255 affect?

CVE-2021-44255 affects motioneye, motioneyeos. Severity is high (CVSS 7.2). Authenticated remote code execution in MotionEye <= 0.42.1 and MotioneEyeOS <= 20200606 allows a remote attacker to upload a configuration backup file containing a malicious python pickle file which will execute arbitrary code on the server

This month

HIGH 7.2UPGRADEUPGRADE

CVE-2021-44255 is a high-severity flaw (CVSS 7.2) affecting motioneye, motioneyeos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Authenticated remote code execution in MotionEye <= 0.42.1 and MotioneEyeOS <= 20200606 allows a remote attacker to upload a configuration backup file containing a malicious python pickle file which will execute arbitrary code on the server.

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	3.1% (top 12%)
CISA exploited list	No
Weakness	CWE-306
Published	2022-01-31
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: motioneye project · motioneyeos project

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

Am I affected?

Timeline

2022-01-31 12:15 UTCPublished CVE record published
2026-06-17 04:12 UTCUpdated Record last modified

motioneye project motioneye UPGRADE

Affected: < 0.42.1

Fixed in: 0.42.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.42.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade motioneye

Note

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

motioneyeos project motioneyeos UPGRADE

Affected: < 20200606

Fixed in: 20200606

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2021-44255?

motioneye: upgrade to 0.42.1; motioneyeos: upgrade to 20200606. Exact commands for each OS are on this page.

Is CVE-2021-44255 being exploited?

CVE-2021-44255 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-2021-44255 affect?

CVE-2021-44255 affects motioneye, motioneyeos. Severity is high (CVSS 7.2). Authenticated remote code execution in MotionEye <= 0.42.1 and MotioneEyeOS <= 20200606 allows a remote attacker to upload a configuration backup file containing a malicious python pickle file which will execute arbitrary code on the server

How urgent is CVE-2021-44255?

Priority 47/100. High severity

Software pages

Python vulnerabilities

Related CVEs

CVE-2025-60787 HIGH 7.2 DOWNGRADE MotionEye v0.43.1b4 and before is vulnerable to OS Command Injection in configuration parameters such as image
CVE-2022-25568 HIGH 7.5 UPGRADE MotionEye v0.42.1 and below allows attackers to access sensitive information via a GET request to /config/list

References

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