Auth bypass in Open Bmcs Openbmcs
CVE-2021-47701
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (39.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 39.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000
Affected products
- Open Bmcs Openbmcs — versions 2.4
- Openbmcs — versions 2.4
Weakness classification (CWE)
References
- www.exploit-db.com/exploits/50669 (Exploit, VDB Entry, Third Party Advisory, exploit)
- www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5693.php (Exploit, Third Party Advisory, third-party-advisory)
- www.vulncheck.com/advisories/openbmcs-user-management-privilege-escalation (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2021-47701?
- CVE-2021-47701 is a high-severity vulnerability in Open Bmcs Openbmcs, classified under Missing Authorization. CVSS score: 8.8/10. Published 2025-12-09.
- How severe is CVE-2021-47701?
- High severity. CVSS v3 base score is 8.8 out of 10.