CVE-2021-39173: Cachet is an open source status page system

Q: How do I fix CVE-2021-39173?

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

Q: Is CVE-2021-39173 being exploited?

CVE-2021-39173 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-2021-39173 affect?

CVE-2021-39173 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 trick Cachet and install the instance again, leading to arbitrary code execution on the server. Thi

Q: How urgent is CVE-2021-39173?

Priority 57/100. High severity; Public exploit reference

This month

HIGH 8.8UPGRADE

CVE-2021-39173 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 trick Cachet and install the instance again, leading to arbitrary code execution on the server. This issue was addressed in version 2.5.1 by improving the middleware `ReadyForUse`, which now performs a stricter validation of the instance name. As a workaround, only allow trusted source IP addresses to access

Why this priority

High severity
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	2.4% (top 16%)
CISA exploited list	No
Weakness	CWE-704
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-2021-39173?

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

Is CVE-2021-39173 being exploited?

CVE-2021-39173 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-2021-39173 affect?

CVE-2021-39173 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 trick Cachet and install the instance again, leading to arbitrary code execution on the server. Thi

How urgent is CVE-2021-39173?

Priority 57/100. High severity; Public exploit reference

Related CVEs

CVE-2021-39174 HIGH 8.8 UPGRADE Cachet is an open source status page system
CVE-2021-39172 HIGH 8.8 UPGRADE Cachet is an open source status page system

References

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