CVE-2021-41238: Hangfire is an open source system to perform background job processing in a .NET or .NET Core applications

This month

HIGH 8.6REMOTEDOWNGRADE

CVE-2021-41238 is a high-severity flaw (CVSS 8.6) affecting hangfire. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Hangfire is an open source system to perform background job processing in a .NET or .NET Core applications. No Windows Service or separate process required. Dashboard UI in Hangfire.Core uses authorization filters to protect it from showing sensitive data to unauthorized users. By default when no custom authorization filters specified, `LocalRequestsOnlyAuthorizationFilter` filter is being used to allow only local requests and prohibit all the re

Why this priority

High severity
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	8.6 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.0% (top 38%)
CISA exploited list	No
Weakness	CWE-862
Published	2021-11-02
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: hangfire

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

Am I affected?

Timeline

2021-11-02 18:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

hangfire hangfire DOWNGRADE

Affected: 1.7.25

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.7.25

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.7.25 (Debian / Ubuntu)

apt-cache madison hangfire sudo apt install hangfire=<VERSION_BEFORE_1.7.25> sudo apt-mark hold hangfire

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

dnf --showduplicates list hangfire sudo dnf downgrade hangfire-<VERSION_BEFORE_1.7.25> sudo dnf versionlock add hangfire

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-2021-41238?

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

Is CVE-2021-41238 being exploited?

CVE-2021-41238 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-2021-41238 affect?

CVE-2021-41238 affects hangfire. Severity is high (CVSS 8.6). Hangfire is an open source system to perform background job processing in a .NET or .NET Core applications. No Windows Service or separate process required. Dashboard UI in Hangfire.Core uses authorization filters to protect it from showing

How urgent is CVE-2021-41238?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

Software pages

Windows vulnerabilities · .NET vulnerabilities

References

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