CVE-2021-26273: The Agent in NinjaRMM 5.0.909 has Incorrect Access Control.

This month

HIGH 7.8DOWNGRADE

CVE-2021-26273 is a high-severity flaw (CVSS 7.8) affecting ninjarmm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Agent in NinjaRMM 5.0.909 has Incorrect Access Control.

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-863
Published	2021-07-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ninjarmm

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

Am I affected?

Timeline

2021-07-07 14:15 UTCPublished CVE record published
2026-06-17 03:43 UTCUpdated Record last modified

ninjarmm ninjarmm DOWNGRADE

Affected: 5.0.909

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.0.909

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 5.0.909 (Debian / Ubuntu)

apt-cache madison ninjarmm sudo apt install ninjarmm=<VERSION_BEFORE_5.0.909> sudo apt-mark hold ninjarmm

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list ninjarmm sudo dnf downgrade ninjarmm-<VERSION_BEFORE_5.0.909> sudo dnf versionlock add ninjarmm

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-2021-26273?

ninjarmm: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-26273 being exploited?

CVE-2021-26273 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-2021-26273 affect?

CVE-2021-26273 affects ninjarmm. Severity is high (CVSS 7.8). The Agent in NinjaRMM 5.0.909 has Incorrect Access Control.

How urgent is CVE-2021-26273?

Priority 40/100. High severity; Public exploit reference

Related CVEs

CVE-2021-26274 HIGH 7.1 DOWNGRADE The Agent in NinjaRMM 5.0.909 has Insecure Permissions.

References

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