CVE-2021-31232

Name: CVE-2021-31232
Creator: NVD / NIST
Published: 2021-04-30T13:15:07.577+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.37%

Last modified Jun 17, 2026

CVE-2021-31232 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. The Alertmanager in CNCF Cortex before 1.8.1 has a local file disclosure vulnerability when -experimental.alertmanager.enable-api is used. The HTTP basic auth password_file can be used as an attack vector to send any file content via a webhook. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

The Alertmanager in CNCF Cortex before 1.8.1 has a local file disclosure vulnerability when -experimental.alertmanager.enable-api is used. The HTTP basic auth password_file can be used as an attack vector to send any file content via a webhook. The alertmanager templates can be used as an attack vector to send any file content because the alertmanager can load any text file specified in the templates list.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.37%

28.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Linuxfoundation	Cortex	< 1.8.1

References

https://community.grafana.com/c/security-announcementsThird Party Advisory
https://github.com/cortexproject/cortexThird Party Advisory
https://github.com/cortexproject/cortex/pull/4129/filesPatch, Third Party Advisory
https://lists.cncf.io/g/cortex-users/message/50Release Notes, Vendor Advisory
https://community.grafana.com/c/security-announcementsThird Party Advisory
https://github.com/cortexproject/cortexThird Party Advisory
https://github.com/cortexproject/cortex/pull/4129/filesPatch, Third Party Advisory
https://lists.cncf.io/g/cortex-users/message/50Release Notes, Vendor Advisory

Timeline

Published: Apr 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31232?

How severe is CVE-2021-31232?

CVE-2021-31232 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31232?

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-2021-31232?

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

Scan your code now

Source: NVD / NIST