CVE-2021-39172: Cachet is an open source status page system

Q: How do I fix CVE-2021-39172?

catchet: upgrade to 2.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-39172 being exploited?

CVE-2021-39172 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-2021-39172 affect?

CVE-2021-39172 affects catchet. Severity is high (CVSS 8.8). Cachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit a new line injection in the configuration edition feature (e.g. mail settings) and gain ar

Q: How urgent is CVE-2021-39172?

Priority 60/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference

This week

HIGH 8.8UPGRADE

CVE-2021-39172 is a high-severity flaw (CVSS 8.8) affecting catchet. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit a new line injection in the configuration edition feature (e.g. mail settings) and gain arbitrary code execution on the server. This issue was addressed in version 2.5.1 by improving `UpdateConfigCommandHandler` and preventing the use of new lines characters in new configuration values. As a workaro

Why this priority

High severity
EPSS top 2%: very likely to be exploited
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	29.2% (top 2%)
CISA exploited list	No
Weakness	CWE-93
Published	2021-08-27
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: catchethq

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

Am I affected?

Timeline

2021-08-27 23:15 UTCPublished CVE record published
2026-06-17 04:03 UTCUpdated Record last modified

catchethq catchet UPGRADE

Affected: < 2.5.1

Fixed in: 2.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.5.1 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade catchet

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-2021-39172?

catchet: upgrade to 2.5.1. Exact commands for each OS are on this page.

Is CVE-2021-39172 being exploited?

CVE-2021-39172 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-2021-39172 affect?

CVE-2021-39172 affects catchet. Severity is high (CVSS 8.8). Cachet is an open source status page system. Prior to version 2.5.1, authenticated users, regardless of their privileges (User or Admin), can exploit a new line injection in the configuration edition feature (e.g. mail settings) and gain ar

How urgent is CVE-2021-39172?

Priority 60/100. High severity; EPSS top 2%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2021-39174 HIGH 8.8 UPGRADE Cachet is an open source status page system
CVE-2021-39173 HIGH 8.8 UPGRADE Cachet is an open source status page system

References

← Back to latest CVEs