CVE-2021-41271

Name: CVE-2021-41271
Creator: NVD / NIST
Published: 2021-11-15T22:15:06.977+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 0.94%

Last modified Jun 17, 2026

CVE-2021-41271 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Discourse is a platform for community discussion. In affected versions a maliciously crafted request could cause an error response to be cached by intermediate proxies. EPSS estimates a 0.94% chance of exploitation in the next 30 days.

Description

Discourse is a platform for community discussion. In affected versions a maliciously crafted request could cause an error response to be cached by intermediate proxies. This could cause a loss of confidentiality for some content. This issue is patched in the latest stable, beta and tests-passed versions of Discourse.

Metrics

CVSS 3.1

5.3/10

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

EPSS Probability

0.94%

56.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-200

Affected Software

Vendor	Product	Versions	Update
Discourse	Discourse	<= 2.7.9	—
Discourse	Discourse	2.8.0	Beta1

References

https://github.com/discourse/discourse/commit/2da0001965c6d8632d723c46ea5df9f22a1a23f1Patch, Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-hf6r-mc9j-hf4pThird Party Advisory
https://github.com/discourse/discourse/commit/2da0001965c6d8632d723c46ea5df9f22a1a23f1Patch, Third Party Advisory
https://github.com/discourse/discourse/security/advisories/GHSA-hf6r-mc9j-hf4pThird Party Advisory

Timeline

Published: Nov 15, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-41271?

How severe is CVE-2021-41271?

CVE-2021-41271 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 0.94% probability of exploitation in the next 30 days.

How do I fix CVE-2021-41271?

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-2021-41271?

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

Scan your code now

Source: NVD / NIST