What is CVE-2020-5519?

CVE-2020-5519 is a critical-severity vulnerability in Litespeedtech Openlitespeed, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2020-01-06.

How severe is CVE-2020-5519?

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

Improper input validation in Litespeedtech Openlitespeed

CVE-2020-5519

The WebAdmin Console in OpenLiteSpeed before v1.6.5 does not strictly check request URLs, as demonstrated by the "Server Configuration > External App" screen.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2020-01-06 · 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: 0.012 (66.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Litespeedtech Openlitespeed

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

forum.openlitespeed.org/threads/openlitespeed-v1-6-5-now-available.4047/ (Vendor Advisory)
drive.google.com/open (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2020-5519?: CVE-2020-5519 is a critical-severity vulnerability in Litespeedtech Openlitespeed, classified under Improper Input Validation. CVSS score: 9.8/10. Published 2020-01-06.
How severe is CVE-2020-5519?: Critical severity. CVSS v3 base score is 9.8 out of 10.