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Vulnerability record · CVE-2020-25200 · published 1 October 2020

CVE-2020-25200: Pritunl observable discrepancy vulnerability

Pritunl · Pritunl

Pritunl 1.29.2145.25 allows attackers to enumerate valid VPN usernames via a series of /auth/session login attempts. Initially, the server will return error 401. However, if the username is valid, then after 20 login attempts, the server will start responding with error 400. Invalid usernames will receive error 401 indefinitely. Note: This has been disputed by the vendor as not a vulnerability. They argue that this is an intended design

5.3 CVSS 3.1 Medium EPSS 7.5% · top 5.7% CWE-203 · Observable discrepancy
5.3CVSS 3.1 base score, v2 5.0
7.5%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Pritunl 1.29.2145.25 allows attackers to enumerate valid VPN usernames via a series of /auth/session login attempts. Initially, the server will return error 401. However, if the username is valid, then after 20 login attempts, the server will start responding with error 400. Invalid usernames will receive error 401 indefinitely. Note: This has been disputed by the vendor as not a vulnerability. They argue that this is an intended design

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/lukaszstu/pritunl/blob/master/CVE-2020-25200 ExploitThird Party Advisory
https://pritunl.com Vendor Advisory
https://pritunl.com/security Vendor Advisory
https://github.com/lukaszstu/pritunl/blob/master/CVE-2020-25200 ExploitThird Party Advisory
https://pritunl.com Vendor Advisory
https://pritunl.com/security Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2020-25200), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.