CVE-2020-37124B64dec 1.1.2 - Buffer Overflow (SEH Overflow + Egg Hunter)
Updated under an hour ago ()
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It affects 4Mhz B64dec. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-121
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Feb 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
4Mhz B64dec 4mhz:b64dec (from the name) | 1.1.2 | CNA record |
References
- https://www.exploit-db.com/exploits/48317exploit
- http://4mhz.de/b64dec.htmlproduct
- https://www.vulncheck.com/advisories/bdec-buffer-overflow-seh-overflow-egg-hunterthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.