What is CVE-2020-18879?

CVE-2020-18879 is a critical-severity vulnerability in Bludit, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-08-20.

How severe is CVE-2020-18879?

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

Is CVE-2020-18879 known to be exploited?

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

Arbitrary file upload in Bludit

CVE-2020-18879

Unrestricted File Upload in Bludit v3.8.1 allows remote attackers to execute arbitrary code by uploading malicious files via the component 'bl-kereln/ajax/upload-logo.php'.

Vulnerability class: Unrestricted File Upload

Published 2021-08-20 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.031 (87.4th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 87th percentile — 87.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.031 · newest: 0.031 · change: 0.000

Affected products

Bludit — versions 3.8.1

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

References

github.com/bludit/bludit/issues/1011 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-18879?: CVE-2020-18879 is a critical-severity vulnerability in Bludit, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2021-08-20.
How severe is CVE-2020-18879?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-18879 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.