What is CVE-2021-36548?

CVE-2021-36548 is a critical-severity vulnerability in Monstra, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-10-28.

How severe is CVE-2021-36548?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-36548 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Arbitrary file upload in Monstra

CVE-2021-36548

A remote code execution (RCE) vulnerability in the component /admin/index.php?id=themes&action=edit_template&filename=blog of Monstra v3.0.4 allows attackers to execute arbitrary commands via a crafted PHP file.

Vulnerability class: Unrestricted File Upload

EPSS: 0.032 (87.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Monstra — versions 3.0.4
N/a — versions n/a

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

References

cve@mitre.org (Exploit, Third Party Advisory, x_refsource_MISC, Issue Tracking)

Frequently asked questions

What is CVE-2021-36548?: CVE-2021-36548 is a critical-severity vulnerability in Monstra, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-10-28.
How severe is CVE-2021-36548?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-36548 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.