CVE-2025-15467 — Stack buffer overflow in CMS (Auth)EnvelopedData parsing

Affected: OpenSSL, Siemens AI Lightweight Inference Server, Siemens Connector for Azure, Siemens Databus, Siemens Desigo CC family V7, Siemens Desigo CC family V8, Siemens Desigo CC family V9, Siemens HiMed Cockpit, Siemens RUGGEDCOM RM1224 LTE(4G) EU, Siemens RUGGEDCOM RM1224 LTE(4G) NAM and 245 more

Issue summary: Parsing CMS AuthEnvelopedData or EnvelopedData message with maliciously crafted AEAD parameters can trigger a stack buffer overflow.

Impact summary: A stack buffer overflow may lead to a crash, causing Denial of Service, or potentially remote code execution.

When parsing CMS (Auth)EnvelopedData structures that use AEAD ciphers such as AES-GCM, the IV (Initialization Vector) encoded in the ASN.1 parameters is copied into a fixed-size stack buffer without verifying that its length fits the destination. An attacker can supply a crafted CMS message with an oversized IV, causing a stack-based out-of-bounds write before any authentication or tag verification occurs.

Applications and services that parse untrusted CMS or PKCS#7 content using AEAD ciphers (e.g., S/MIME (Auth)EnvelopedData with AES-GCM) are vulnerable. Because the overflow occurs prior to authentication, no valid key material is required to trigger it. While exploitability to remote code execution depends on platform and toolchain mitigations, the stack-based write primitive represents a severe risk.

The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the CMS implementation is outside the OpenSSL FIPS module boundary.

OpenSSL 3.6, 3.5, 3.4, 3.3 and 3.0 are vulnerable to this issue.

OpenSSL 1.1.1 and 1.0.2 are not affected by this issue.

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bdu:2026-04957

CVE-2025-15467 — Stack buffer overflow in CMS (Auth)EnvelopedData parsing