CVE-2019-25634Base64 Decoder 1.1.2 Local Buffer Overflow SEH Egghunter
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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Base64 Decoder 1.1.2 contains a stack-based buffer overflow vulnerability that allows local attackers to execute arbitrary code by triggering a structured exception handler (SEH) overwrite. Attackers can craft a malicious input file that overflows a buffer, overwrites the SEH chain with a POP-POP-RET gadget address, and uses an egghunter payload to locate and execute shellcode for code execution.
- CVSS
- 8.4 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-787
- 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
- Analyzed
- Record last updated
- Jul 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
4Mhz Base64 Decoder 4mhz:base64_decoder (from the name) | 1.1.2 | CNA record |
4mhz base64_decoder 4mhz:base64_decoder | 1.1.2 | NVD |
References
- https://www.exploit-db.com/exploits/46625exploit
- http://4mhz.de/b64dec.htmlproduct, release-notes
- http://4mhz.de/download.php?file=b64dec-1-1-2.zipproduct
- https://www.vulncheck.com/advisories/base64-decoder-local-buffer-overflow-seh-egghunterthird-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.