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Vulnerability record · CVE-2021-31245 · published 6 May 2021

CVE-2021-31245: Openmptcprouter improper authentication vulnerability

Openmptcprouter · Openmptcprouter

omr-admin.py in openmptcprouter-vps-admin 0.57.3 and earlier compares the user provided password with the original password in a length dependent manner, which allows remote attackers to guess the password via a timing attack.

5.9 CVSS 3.1 Medium EPSS 2.1% · top 19.2% CWE-287 · Improper authentication
5.9CVSS 3.1 base score, v2 4.3
2.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

omr-admin.py in openmptcprouter-vps-admin 0.57.3 and earlier compares the user provided password with the original password in a length dependent manner, which allows remote attackers to guess the password via a timing attack.

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

Affected products

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

References

LinkTags
https://github.com/Ysurac/openmptcprouter-vps-admin Third Party Advisory
https://github.com/Ysurac/openmptcprouter-vps-admin/commit/a01cbc8c3d3b8bb7720bf3ff234671b4c0e1859c#diff-b89ee68e63302a7 PatchThird Party Advisory
https://medium.com/d3crypt/timing-attack-on-openmptcprouter-vps-admin-authentication-cve-2021-31245-12dd92303e1 ExploitPatchThird Party Advisory
https://www.openmptcprouter.com/ Vendor Advisory
https://github.com/Ysurac/openmptcprouter-vps-admin Third Party Advisory
https://github.com/Ysurac/openmptcprouter-vps-admin/commit/a01cbc8c3d3b8bb7720bf3ff234671b4c0e1859c#diff-b89ee68e63302a7 PatchThird Party Advisory
https://medium.com/d3crypt/timing-attack-on-openmptcprouter-vps-admin-authentication-cve-2021-31245-12dd92303e1 ExploitPatchThird Party Advisory
https://www.openmptcprouter.com/ Vendor Advisory

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

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Source: NIST National Vulnerability Database (record CVE-2021-31245), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.