CVE-2021-26936: The replay-sorcery program in ReplaySorcery 0.4.0 through 0.5.0, when using the default setuid-root configurat

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HIGH 7.8UPGRADE

CVE-2021-26936 is a high-severity flaw (CVSS 7.8) affecting replaysorcery. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The replay-sorcery program in ReplaySorcery 0.4.0 through 0.5.0, when using the default setuid-root configuration, allows a local attacker to escalate privileges to root by specifying video output paths in privileged locations.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 56%)
CISA exploited list	No
Weakness	CWE-269
Published	2021-02-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: replaysorcery project

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

Am I affected?

Timeline

2021-02-10 18:15 UTCPublished CVE record published
2026-06-17 03:44 UTCUpdated Record last modified

replaysorcery project replaysorcery UPGRADE

Affected: >= 0.4.0 and <= 0.5.0

Fixed in: newer than 0.5.0

Safe to downgrade to: a release before 0.4.0

1. Check installed version

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

2. UPGRADE to newer than 0.5.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade replaysorcery

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 0.4.0 (Debian / Ubuntu)

apt-cache madison replaysorcery sudo apt install replaysorcery=<VERSION_BEFORE_0.4.0> sudo apt-mark hold replaysorcery

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

dnf --showduplicates list replaysorcery sudo dnf downgrade replaysorcery-<VERSION_BEFORE_0.4.0> sudo dnf versionlock add replaysorcery

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-2021-26936?

replaysorcery: upgrade to newer than 0.5.0. Exact commands for each OS are on this page.

Is CVE-2021-26936 being exploited?

CVE-2021-26936 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-2021-26936 affect?

CVE-2021-26936 affects replaysorcery. Severity is high (CVSS 7.8). The replay-sorcery program in ReplaySorcery 0.4.0 through 0.5.0, when using the default setuid-root configuration, allows a local attacker to escalate privileges to root by specifying video output paths in privileged locations.

How urgent is CVE-2021-26936?

Priority 43/100. High severity; Public exploit reference

Related CVEs

CVE-2021-36983 HIGH 7.8 DOWNGRADE replay-sorcery-kms in Replay Sorcery 0.6.0 allows a local attacker to gain root privileges via a symlink attac

References

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