CVE-2020-10539

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-02-05 · updated 2026-06-17
Weakness: CWE-287

Description

An issue was discovered in Epikur before 20.1.1. The Epikur server contains the checkPasswort() function that, upon user login, checks the submitted password against the user password's MD5 hash stored in the database. It is also compared to a second MD5 hash, which is the same for every user (aka a "Backdoor Password" of 3p1kursupport). If the submitted password matches either one, access is granted.

Affected products

Epikur: before 20.1.1 — fixed in 20.1.1

How to fix

Upgrade to a fixed version: Epikur 20.1.1. Check the vendor advisory for mitigations.

References

https://www.x41-dsec.de/lab/advisories/x41-2020-003-epikur
https://www.x41-dsec.de/lab/advisories/x41-2020-003-epikur

Get alerted when CVE-2020-10539 or the next vulnerability affects your stack