What is CVE-2020-25483?

CVE-2020-25483 is a critical-severity vulnerability in Ucms Project, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2020-10-23.

How severe is CVE-2020-25483?

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

Is CVE-2020-25483 known to be exploited?

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

Arbitrary file upload in Ucms Project

CVE-2020-25483

An arbitrary command execution vulnerability exists in the fopen() function of file writes of UCMS v1.4.8, where an attacker can gain access to the server.

Vulnerability class: Unrestricted File Upload

Published 2020-10-23 · 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: 0.086 (94.9th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 95th percentile — 94.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.086 · newest: 0.086 · change: 0.000

Affected products

Ucms Project — versions 1.4.8

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

Public proof-of-concept exploits

References

sunian19.github.io/2020/09/08/UCMS v.1.4.8 Command execution/ (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-25483?: CVE-2020-25483 is a critical-severity vulnerability in Ucms Project, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2020-10-23.
How severe is CVE-2020-25483?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2020-25483 known to be exploited?: 11 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.