What’s Vulnerable › Vulnerabilities

CVE-2020-37124: B64dec 1.1.2 - Buffer Overflow (SEH Overflow + Egg Hunter)

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-05 · updated 2026-06-17
• Weakness: CWE-121

Description

B64dec 1.1.2 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler (SEH) with crafted input. Attackers can leverage an egg hunter technique and carefully constructed payload to inject and execute malicious code during base64 decoding process.

Affected products

• 4Mhz B64dec: 1.1.2

References

• http://4mhz.de/b64dec.html
• https://www.exploit-db.com/exploits/48317
• https://www.vulncheck.com/advisories/bdec-buffer-overflow-seh-overflow-egg-hunter

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