Buffer Overflow Vulnerability in B64dec by 4mhz
CVE-2020-37124

8.4HIGH

Key Information:

Vendor

4mhz

Status
B64dec
Vendor
CVE Published:
5 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-37124?

B64dec version 1.1.2 suffers from a buffer overflow vulnerability that can allow cyber attackers to execute arbitrary code. This occurs when crafted input overwrites the Structured Exception Handler (SEH), enabling the use of techniques such as egg hunters to inject malicious payloads during the base64 decoding process. Attackers exploiting this vulnerability can gain control over the affected application, posing significant security risks.

Human OS v1.0:
Ageing Is an Unpatched Zero-Day Vulnerability.

Remediate biological technical debt. Prime Ageing uses 95% high-purity SIRT6 activation to maintain genomic integrity and bolster systemic resilience.

Deploy the Patch

Affected Version(s)

B64dec 1.1.2

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-2020-37124 - Proof of Concept

References

https://www.exploit-db.com/exploits/48317
exploit
http://4mhz.de/b64dec.html
product
https://www.vulncheck.com/advisories/bdec-buffer-overflow...
third-party-advisory

CVSS V4

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Andy Bowden
JSON
.