CVE-2021-23727

Name: CVE-2021-23727
Creator: NVD / NIST
Published: 2021-12-29T17:15:07.413+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.88%

Last modified Jun 17, 2026

CVE-2021-23727 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. This affects the package celery before 5.2.2. It by default trusts the messages and metadata stored in backends (result stores). EPSS estimates a 3.88% chance of exploitation in the next 30 days.

Description

This affects the package celery before 5.2.2. It by default trusts the messages and metadata stored in backends (result stores). When reading task metadata from the backend, the data is deserialized. Given that an attacker can gain access to, or somehow manipulate the metadata within a celery backend, they could trigger a stored command injection vulnerability and potentially gain further access to the system.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.88%

88.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-77

Affected Software

Vendor	Product	Versions
Celeryproject	Celery	< 5.2.2
Fedoraproject	Extra Packages For Enterprise Linux	7.0
Fedoraproject	Fedora	35

References

https://github.com/celery/celery/blob/master/Changelog.rst%23522Broken Link, Release Notes, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SYXRGHWHD2WWMHBWCVD5ULVINPKNY3P5/
https://snyk.io/vuln/SNYK-PYTHON-CELERY-2314953Exploit, Third Party Advisory
https://github.com/celery/celery/blob/master/Changelog.rst%23522Broken Link, Release Notes, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SYXRGHWHD2WWMHBWCVD5ULVINPKNY3P5/
https://snyk.io/vuln/SNYK-PYTHON-CELERY-2314953Exploit, Third Party Advisory

Timeline

Published: Dec 29, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-23727?

How severe is CVE-2021-23727?

CVE-2021-23727 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.88% probability of exploitation in the next 30 days.

How do I fix CVE-2021-23727?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-23727?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST