CVE-2020-26566: A Denial of Service condition in Motion-Project Motion 3.2 through 4.3.1 allows remote unauthenticated users t

This week

HIGH 7.5REMOTEUPGRADE

CVE-2020-26566 is a high-severity flaw (CVSS 7.5) affecting motion. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Denial of Service condition in Motion-Project Motion 3.2 through 4.3.1 allows remote unauthenticated users to cause a webu.c segmentation fault and kill the main process via a crafted HTTP request.

Why this priority

High severity
EPSS top 9%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.4% (top 9%)
CISA exploited list	No
Weakness	CWE-125
Published	2020-10-26
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: motion project

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

Am I affected?

Timeline

2020-10-26 18:15 UTCPublished CVE record published
2026-06-17 03:08 UTCUpdated Record last modified

motion project motion UPGRADE

Affected: >= 3.2 and <= 4.3.1

Fixed in: newer than 4.3.1

Safe to downgrade to: a release before 3.2

1. Check installed version

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

2. UPGRADE to newer than 4.3.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade motion

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 3.2 (Debian / Ubuntu)

apt-cache madison motion sudo apt install motion=<VERSION_BEFORE_3.2> sudo apt-mark hold motion

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

dnf --showduplicates list motion sudo dnf downgrade motion-<VERSION_BEFORE_3.2> sudo dnf versionlock add motion

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-2020-26566?

motion: upgrade to newer than 4.3.1. Exact commands for each OS are on this page.

Is CVE-2020-26566 being exploited?

CVE-2020-26566 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-2020-26566 affect?

CVE-2020-26566 affects motion. Severity is high (CVSS 7.5). A Denial of Service condition in Motion-Project Motion 3.2 through 4.3.1 allows remote unauthenticated users to cause a webu.c segmentation fault and kill the main process via a crafted HTTP request.

How urgent is CVE-2020-26566?

Priority 59/100. High severity; EPSS top 9%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

References

← Back to latest CVEs