CVE-2021-40376: otris Update Manager 1.2.1.0 allows local users to achieve SYSTEM access via unauthenticated calls to exposed

This month

HIGH 7.8DOWNGRADE

CVE-2021-40376 is a high-severity flaw (CVSS 7.8) affecting update manager. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

otris Update Manager 1.2.1.0 allows local users to achieve SYSTEM access via unauthenticated calls to exposed interfaces over a .NET named pipe. A remote attack may be possible as well, by leveraging WsHTTPBinding for HTTP traffic on TCP port 9000.

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 66%)
CISA exploited list	No
Weakness	CWE-287
Published	2022-03-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: otris

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

Am I affected?

Timeline

2022-03-10 17:43 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

otris update manager DOWNGRADE

Affected: 1.2.1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.1.0

1. Check installed version

apt-cache policy update-manager || rpm -q update-manager || update-manager --version

2. No fixed release: DOWNGRADE to a release before 1.2.1.0 (Debian / Ubuntu)

apt-cache madison update-manager sudo apt install update-manager=<VERSION_BEFORE_1.2.1.0> sudo apt-mark hold update-manager

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

dnf --showduplicates list update-manager sudo dnf downgrade update-manager-<VERSION_BEFORE_1.2.1.0> sudo dnf versionlock add update-manager

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-2021-40376?

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

Is CVE-2021-40376 being exploited?

CVE-2021-40376 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-2021-40376 affect?

CVE-2021-40376 affects update manager. Severity is high (CVSS 7.8). otris Update Manager 1.2.1.0 allows local users to achieve SYSTEM access via unauthenticated calls to exposed interfaces over a .NET named pipe. A remote attack may be possible as well, by leveraging WsHTTPBinding for HTTP traffic on TCP po

How urgent is CVE-2021-40376?

Priority 41/100. High severity; Public exploit reference

References

← Back to latest CVEs