CVE-2025-15467

Technical Description

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 pl

Remediation

Check the references section for vendor advisories and patches from openssl. Update openssl to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References