CVE-2022-3257

Name: CVE-2022-3257
Creator: NVD / NIST
Published: 2022-09-23T15:15:13.857+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.08%

Last modified Jun 17, 2026

CVE-2022-3257 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Mattermost version 7.1.x and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service.. EPSS estimates a 1.08% chance of exploitation in the next 30 days.

Description

Mattermost version 7.1.x and earlier fails to sufficiently process a specifically crafted GIF file when it is uploaded while drafting a post, which allows authenticated users to cause resource exhaustion while processing the file, resulting in server-side Denial of Service.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.08%

61.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mattermost	Mattermost Server	< 7.2.0

References

https://hackerone.com/reports/1620170Exploit, Third Party Advisory
https://mattermost.com/security-updates/Vendor Advisory
https://hackerone.com/reports/1620170Exploit, Third Party Advisory
https://mattermost.com/security-updates/Vendor Advisory

Timeline

Published: Sep 23, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-3257?

How severe is CVE-2022-3257?

CVE-2022-3257 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.08% probability of exploitation in the next 30 days.

How do I fix CVE-2022-3257?

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-2022-3257?

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

Scan your code now

Source: NVD / NIST