CVE-2020-37124

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.

CVSS v4.0

8.4 HIGHCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

0.35% chance of exploitation in the next 30 days, 28th percentile

Published

2026-02-05

Updated

2026-02-06

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/48317

References

• CVE Record
• NVD entry

Related

• CVE-2020-37123
• CVE-2020-37125
• CVE-2020-37122
• CVE-2020-37126
• CVE-2020-37121
• CVE-2020-37127