CVE-2021-40324: Cobbler before 3.3.0 allows arbitrary file write operations via upload_log_data.

Q: How do I fix CVE-2021-40324?

cobbler: upgrade to newer than 3.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-40324 being exploited?

CVE-2021-40324 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-2021-40324 affect?

CVE-2021-40324 affects cobbler. Severity is high (CVSS 7.5). Cobbler before 3.3.0 allows arbitrary file write operations via upload_log_data.

Q: How urgent is CVE-2021-40324?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2021-40324 is a high-severity flaw (CVSS 7.5) affecting cobbler. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cobbler before 3.3.0 allows arbitrary file write operations via upload_log_data.

Why this priority

High severity
EPSS top 1%: very likely to be exploited
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	68.6% (top 1%)
CISA exploited list	No
Weakness	CWE-434
Published	2021-10-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cobbler project

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

Am I affected?

Timeline

2021-10-04 06:15 UTCPublished CVE record published
2026-06-17 04:06 UTCUpdated Record last modified

cobbler project cobbler UPGRADE

Affected: <= 3.3.0

Fixed in: newer than 3.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 3.3.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade cobbler

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-2021-40324?

cobbler: upgrade to newer than 3.3.0. Exact commands for each OS are on this page.

Is CVE-2021-40324 being exploited?

CVE-2021-40324 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-2021-40324 affect?

CVE-2021-40324 affects cobbler. Severity is high (CVSS 7.5). Cobbler before 3.3.0 allows arbitrary file write operations via upload_log_data.

How urgent is CVE-2021-40324?

Priority 56/100. High severity; EPSS top 1%: very likely to be exploited; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-0860 CRITICAL 9.1 UPGRADE MITIGATE Improper Authorization in GitHub repository cobbler/cobbler prior to 3.3.2.
CVE-2021-45083 HIGH 7.1 UPGRADE MITIGATE An issue was discovered in Cobbler before 3.3.1
CVE-2021-45082 HIGH 7.8 UPGRADE MITIGATE An issue was discovered in Cobbler before 3.3.1
CVE-2021-45081 MEDIUM 5.9 UPGRADE An issue was discovered in Cobbler through 3.3.1
CVE-2021-40325 HIGH 7.5 UPGRADE Cobbler before 3.3.0 allows authorization bypass for modification of settings.

References

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