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Vulnerability record · CVE-2021-47701 · published 9 December 2025

CVE-2021-47701: Openbmcs missing authorization vulnerability

Openbmcs · Openbmcs

OpenBMCS 2.4 allows an attacker to escalate privileges from a read user to an admin user by manipulating permissions and exploiting a vulnerability in the update_user_permissions.php script. Attackers can submit a malicious HTTP POST request to PHP scripts in '/plugins/useradmin/' directory.

8.7 CVSS 4.0 High EPSS 0.48% · top 61.0% CWE-862 · Missing authorization
8.7CVSS 4.0 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

OpenBMCS 2.4 allows an attacker to escalate privileges from a read user to an admin user by manipulating permissions and exploiting a vulnerability in the update_user_permissions.php script. Attackers can submit a malicious HTTP POST request to PHP scripts in '/plugins/useradmin/' directory.

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

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

References

LinkTags
https://www.exploit-db.com/exploits/50669 ExploitThird Party AdvisoryVDB Entry
https://www.vulncheck.com/advisories/openbmcs-user-management-privilege-escalation Third Party Advisory
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5693.php ExploitThird Party 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-2021-47701), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.