Summaryinfo

A vulnerability was found in 4Mhz Base64 Decoder 1.1.2 and classified as critical. Impacted is an unknown function. Executing a manipulation can lead to out-of-bounds write. This vulnerability is registered as CVE-2019-25634. The attack needs to be launched locally. Furthermore, an exploit is available.

Detailsinfo

A vulnerability classified as critical was found in 4Mhz Base64 Decoder 1.1.2. This vulnerability affects an unknown code. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. The CWE definition for the vulnerability is CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at exploit-db.com. This vulnerability was named CVE-2019-25634 since 03/24/2026. The exploitation appears to be easy. The attack needs to be approached locally. Technical details are unknown but a public exploit is available.

It is possible to download the exploit at exploit-db.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Exploit-DB (46625). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• 4Mhz

Name

• Base64 Decoder

Version

• 1.1.2

CPE 2.3info

• 🔒

CPE 2.2info

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