CVE-2025-15467

HIGH EPSS 98.7%
Published Jan 27, 20265mo ago · Modified Jun 17, 20261w ago
8.8 CVSS 3.1
High
Find Similar
Published Jan 27, 2026 5mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.8
Exploitability
2.8
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
98.7% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-787 Out-of-bounds Write Memory Safety

Affected Products 5

VendorProductVersionRange
opensslopenssl*≥3.0.0  –  <3.0.19
opensslopenssl*≥3.1.0  –  <3.3.6
opensslopenssl*≥3.4.0  –  <3.4.4
opensslopenssl*≥3.5.0  –  <3.5.5
opensslopenssl*≥3.6.0  –  <3.6.1

References 10

  • openwall.com http://www.openwall.com/lists/oss-security/2026/01/27/10
    Mailing List
  • openwall.com http://www.openwall.com/lists/oss-security/2026/02/25/6
    Mailing List
  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-434797.html
  • github.com https://github.com/guiimoraes/CVE-2025-15467
    ExploitThird Party Advisory
  • github.com https://github.com/openssl/openssl/commit/2c8f0e5fa9b6ee5508a0349e4572ddb74db5a703
    Patch
  • github.com https://github.com/openssl/openssl/commit/5f26d4202f5b89664c5c3f3c62086276026ba9a9
    Patch
  • github.com https://github.com/openssl/openssl/commit/6ced0fe6b10faa560e410e3ee8d6c82f06c65ea3
    Patch
  • github.com https://github.com/openssl/openssl/commit/ce39170276daec87f55c39dad1f629b56344429e
    Patch
  • github.com https://github.com/openssl/openssl/commit/d0071a0799f20cc8101730145349ed4487c268dc
    Patch
  • openssl-library.org https://openssl-library.org/news/secadv/20260127.txt
    Vendor Advisory

Remediation

  • github.com https://github.com/openssl/openssl/commit/2c8f0e5fa9b6ee5508a0349e4572ddb74db5a703
    Patch
  • github.com https://github.com/openssl/openssl/commit/5f26d4202f5b89664c5c3f3c62086276026ba9a9
    Patch
  • github.com https://github.com/openssl/openssl/commit/6ced0fe6b10faa560e410e3ee8d6c82f06c65ea3
    Patch
  • github.com https://github.com/openssl/openssl/commit/ce39170276daec87f55c39dad1f629b56344429e
    Patch
  • github.com https://github.com/openssl/openssl/commit/d0071a0799f20cc8101730145349ed4487c268dc
    Patch