Directory Traversal Vulnerability in WordPress Plugin Anti-Malware Security and Bruteforce Firewall
CVE-2021-47977

8.7HIGH

Key Information:

Vendor

WordPress
Status
Malware Security And Bruteforce Firewall
Vendor
CVE Published:
16 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-47977?

The Anti-Malware Security and Bruteforce Firewall plugin for WordPress, specifically version 4.20.59, is susceptible to a directory traversal vulnerability. This flaw enables unauthenticated attackers to manipulate the file parameter in requests sent to the duplicator_download action via admin-ajax.php. By employing path traversal sequences, attackers can gain access to sensitive files stored outside the designated directory, potentially exposing confidential system information and increasing the risk of further attacks.

Affected Version(s)

Malware Security and Bruteforce Firewall 0 <= 4.20.72

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-2021-47977 - Proof of Concept

References

https://www.exploit-db.com/exploits/50107
exploit
https://gotmls.net/
product
https://gotmls.net/downloads/
product

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
None
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

TheSmuggler
.