How severe is CVE-2021-40323?

CVE-2021-40323 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-40323 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 87% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-40323?

CVE-2021-40323 affects Cobbler Project Cobbler. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-40323?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-40323 published?

CVE-2021-40323 was published on 2021-10-04 and last updated on 2026-06-17.

CVE-2021-40323

CVE-2021-40323 is a critical-severity vulnerability in Cobbler Project Cobbler with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 87% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 87% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Cobbler Project Cobbler
Published: 2021-10-04
Last modified: 2026-06-17

Description

Cobbler before 3.3.0 allows log poisoning, and resultant Remote Code Execution, via an XMLRPC method that logs to the logfile for template injection.

Frequently asked questions

What is CVE-2021-40323?: Cobbler before 3.3.0 allows log poisoning, and resultant Remote Code Execution, via an XMLRPC method that logs to the logfile for template injection.
How severe is CVE-2021-40323?: CVE-2021-40323 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-40323 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 87% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-40323?: CVE-2021-40323 affects Cobbler Project Cobbler. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-40323?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-40323 published?: CVE-2021-40323 was published on 2021-10-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cobbler_project:cobbler:*:*:*:*:*:*:*:*

More vulnerabilities in Cobbler Project Cobbler

CVE-2018-10931 — Critical (CVSS 9.8): It was found that cobbler 2.6.x exposed all functions from its CobblerXMLRPCInterface class over XMLRPC. A remote,…
CVE-2017-1000469 — Critical (CVSS 9.8): Cobbler version up to 2.8.2 is vulnerable to a command injection vulnerability in the "add repo" component resulting in…
CVE-2022-0860 — Critical (CVSS 9.1): Improper Authorization in GitHub repository cobbler/cobbler prior to 3.3.2.
CVE-2021-45082 — High (CVSS 7.8): An issue was discovered in Cobbler before 3.3.1. In the templar.py file, the function check_for_invalid_imports can…
CVE-2021-40325 — High (CVSS 7.5): Cobbler before 3.3.0 allows authorization bypass for modification of settings.
CVE-2021-40324 — High (CVSS 7.5): Cobbler before 3.3.0 allows arbitrary file write operations via upload_log_data.

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