CVE-2021-31232: The Alertmanager in CNCF Cortex before 1.8.1 has a local file disclosure vulnerability when -experimental.aler

Q: How do I fix CVE-2021-31232?

cortex: upgrade to 1.8.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-31232 being exploited?

CVE-2021-31232 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-31232 affect?

CVE-2021-31232 affects cortex. Severity is medium (CVSS 5.5). 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 webh

Q: How urgent is CVE-2021-31232?

Priority 32/100. On your watchlist

Routine

MEDIUM 5.5WATCHLISTUPGRADE

CVE-2021-31232 is a medium-severity flaw (CVSS 5.5) affecting cortex. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 69%)
CISA exploited list	No
Published	2021-04-30
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: linuxfoundation

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

Am I affected?

Timeline

2021-04-30 13:15 UTCPublished CVE record published
2026-06-17 03:51 UTCUpdated Record last modified

linuxfoundation cortex UPGRADE

Affected: < 1.8.1

Fixed in: 1.8.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 1.8.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade cortex

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cortex

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

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-2021-31232?

cortex: upgrade to 1.8.1. Exact commands for each OS are on this page.

Is CVE-2021-31232 being exploited?

CVE-2021-31232 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-2021-31232 affect?

CVE-2021-31232 affects cortex. Severity is medium (CVSS 5.5). 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 webh

How urgent is CVE-2021-31232?

Priority 32/100. On your watchlist

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References

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