Privilege Escalation Vulnerability in OpenBMCS by OpenBMCS
CVE-2021-47701

8.7HIGH

Key Information:

Vendor

Open Bmcs

Status
Openbmcs
Vendor
CVE Published:
9 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47701?

OpenBMCS 2.4 presents a vulnerability that allows attackers to escalate their privileges from a read-only user to an admin user. This can be accomplished by exploiting the permissions in the update_user_permissions.php script. By sending a specially crafted HTTP POST request to the PHP scripts located in the '/plugins/useradmin/' directory, malicious users can manipulate user permissions, potentially compromising the entire system and accessing sensitive administrative functionalities.

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Affected Version(s)

OpenBMCS 2.4

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2021-47701 - Proof of Concept

References

https://www.exploit-db.com/exploits/50669
exploit
https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-56...
third-party-advisory
https://www.vulncheck.com/advisories/openbmcs-user-manage...
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

LiquidWorm as Gjoko Krstic of Zero Science Lab
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