Stack Buffer Overflow Vulnerability in OpenSSL Parsing CMS Messages
CVE-2025-15467

Currently unrated

Key Information:

Vendor: OpenSSL
Status: OpenSSL
Vendor: CVE Published:; 27 January 2026

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👾 Exploit Exists🟡 Public PoC

What is CVE-2025-15467?

A vulnerability exists in OpenSSL when parsing CMS AuthEnvelopedData structures that employ AEAD ciphers like AES-GCM. This flaw arises from the improper handling of oversized Initialization Vectors (IVs) crafted within ASN.1 parameters, leading to a stack buffer overflow. An attacker can exploit this vulnerability by supplying a specially crafted CMS message, resulting in an out-of-bounds write to memory. This occurs prior to authentication checks, increasing the risk of Denial of Service or potentially allowing for remote code execution, depending on system mitigations. Notably, FIPS modules are not impacted by this issue.

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Affected Version(s)

OpenSSL 3.6.0 < 3.6.1

OpenSSL 3.5.0 < 3.5.5

OpenSSL 3.4.0 < 3.4.4

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-15467
Created by balgan