High severity8.4NVD Advisory· Published Mar 24, 2026· Updated Jun 3, 2026
CVE-2019-25634
CVE-2019-25634
Description
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.
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Affected products
2=1.1.2+ 1 more
- (no CPE)range: =1.1.2
- (no CPE)range: 1.1.2
Patches
Vulnerability mechanics
References
4- www.exploit-db.com/exploits/46625nvdExploit
- www.vulncheck.com/advisories/base64-decoder-local-buffer-overflow-seh-egghunternvdThird Party Advisory
- 4mhz.de/b64dec.htmlnvdProductRelease Notes
- 4mhz.de/download.phpnvdProduct
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