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.

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Workaround

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History

Fri, 06 Feb 2026 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 06 Feb 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared 4mhz
4mhz b64dec
Vendors & Products 4mhz
4mhz b64dec

Thu, 05 Feb 2026 16:30:00 +0000

Type Values Removed Values Added
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.
Title B64dec 1.1.2 - Buffer Overflow (SEH Overflow + Egg Hunter)
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 8.4, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-02-06T20:34:54.145Z

Reserved: 2026-02-03T16:27:45.304Z

Link: CVE-2020-37124

cve-icon Vulnrichment

Updated: 2026-02-06T20:34:51.286Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-02-05T17:16:07.053

Modified: 2026-02-05T20:47:37.777

Link: CVE-2020-37124

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-02-06T12:05:12Z

Weaknesses