CVE-2025-15467

Published Jan 27, 2026

Last updated 17 days ago

CVSS critical 9.8

OpenSSL

CMS AuthEnvelopedData

Container Security

SSL

Tls

Overview

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 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.
Source: openssl-security@openssl.org
NVD status: Modified
Products: openssl

Risk scores

CVSS 3.1

Type: Secondary
Base score: 9.8
Impact score: 5.9
Exploitability score: 3.9
Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Severity: CRITICAL

Weaknesses

openssl-security@openssl.org: CWE-787

Hype score: Not currently trending

Configurations

[
  {
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "C76C5F55-5243-4461-82F5-2FEBFF4D59FA",
            "versionEndExcluding": "3.0.19",
            "versionStartIncluding": "3.0.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "F5292E9E-6B50-409F-9219-7B0A04047AD8",
            "versionEndExcluding": "3.3.6",
            "versionStartIncluding": "3.3.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "B9D3DCAE-317D-4DFB-93F0-7A235A229619",
            "versionEndExcluding": "3.4.4",
            "versionStartIncluding": "3.4.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "1CAC7CBE-EC03-4089-938A-0CEEB2E09B62",
            "versionEndExcluding": "3.5.5",
            "versionStartIncluding": "3.5.0",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*",
            "matchCriteriaId": "68352537-5E99-4F4D-B78A-BCF0353A70A5",
            "versionEndExcluding": "3.6.1",
            "versionStartIncluding": "3.6.0",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ]
  }
]

References

Sources include official advisories and independent security research.

Overview

Risk scores

CVSS 3.1

Weaknesses

Social media

Configurations

Related CVEs

References