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Vulnerability Intelligence

CVE-2025-15467

HighPublic exploit

openssl: OpenSSL: Remote code execution or Denial of Service via oversized Initialization Vector in CMS parsing

Published Jan 27, 2026 · Updated Oct 16, 2026 · Also known as ALPINE-CVE-2025-15467, DEBIAN-CVE-2025-15467, DSA-6113-1, EUVD-2025-206379, GHSA-wvhq-3h88-rf6g, JLSEC-2026-256, UBUNTU-CVE-2025-15467

Key Facts

Patch immediately
  • CVE-2025-15467 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting OpenSSL, libcrypto3-2.34 (chainguard), openssl-3.0 (minimos) and 22 more products.
  • It is not listed in any known-exploited vulnerabilities catalog. Public exploit code is available.
  • EPSS estimates a 52% probability of exploitation in the next 30 days.
  • Fixed versions are available, including edk2 20240524git3e722403cd16-12, libcrypto3-2.34 3.6.1-r0, libopenssl-3-devel 3.0.8-150400.4.78.1.
  • Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

8.8

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS (30-day exploit likelihood)

52%

Higher than 98.9% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

Available

Proof-of-concept or weaponized module

Get the full CVE-2025-15467 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

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.

Affected Products

239 affected entries in total
ProductAffected versionsFixed in
OpenSSLOpenssl>= 3.6.03.0.19
libcrypto3-2.34chainguardSee advisory3.6.1-r0
openssl-3.0minimosSee advisory3.0.20-r0
rootio-opensslrootioSee advisory3.5.5-r0
seal-opensslsealSee advisory3.0.11-1~deb12u2+sp999
20 more affected products in the full CVE brief

Patched Releases

edk2

20240524git3e722403cd16-12

libcrypto3-2.34

3.6.1-r0

libopenssl-3-devel

3.0.8-150400.4.78.1, 3.0.8-150500.5.57.1, 3.1.4-11.1, 3.1.4-150600.5.42.1, 3.1.4-slfo.1.1_8.1, 3.2.3-150700.5.24.1, 3.5.0-160000.5.1, 3.5.3-2.1

libopenssl-3-devel-32bit

3.1.4-150600.5.42.1, 3.5.3-2.1

libopenssl-3-fips-provider

3.1.4-11.1, 3.1.4-150600.5.42.1, 3.1.4-slfo.1.1_8.1, 3.2.3-150700.5.24.1, 3.5.0-160000.5.1, 3.5.3-2.1

libopenssl-3-fips-provider-32bit

3.1.4-150600.5.42.1, 3.2.3-150700.5.24.1, 3.5.3-2.1

libopenssl-3-fips-provider-x86-64-v3

3.5.0-160000.5.1, 3.5.3-2.1

libopenssl3

3.0.8-150400.4.78.1, 3.0.8-150500.5.57.1, 3.1.4-11.1, 3.1.4-150600.5.42.1, 3.1.4-slfo.1.1_8.1, 3.2.3-150700.5.24.1, 3.5.0-160000.5.1, 3.5.3-2.1

libopenssl3-32bit

3.1.4-150600.5.42.1, 3.2.3-150700.5.24.1, 3.5.3-2.1

libopenssl3-x86-64-v3

3.5.0-160000.5.1, 3.5.3-2.1

libssl-dev

3.0.13-0ubuntu3.7, 3.0.2-0ubuntu1.21, 3.5.3-1ubuntu3

libssl-doc

3.0.13-0ubuntu3.7, 3.0.2-0ubuntu1.21, 3.5.3-1ubuntu3

libssl3

3.0.2-0ubuntu1.21

libssl3t64

3.0.13-0ubuntu3.7, 3.5.3-1ubuntu3

Openresty_jll

1.29.203+0

OpenSSL

1:1.0.2k-25.el7_9+sp999, 1:1.1.1k-6.el8_5+sp999, 1:3.0.1-46.el9_0.7, 1:3.2.2-1.amzn2023.0.4, 1:3.2.2-6.el9_5+sp999, 1:3.5.1-7.0.1.el10_1, 1:3.5.1-7.0.1.el9_7, 1:3.5.1-7.el10_1, 1:3.5.1-7.el9_7, 1.0.1e-59.el6_10+sp999, 1.1.1t-r35341999, 10:3.5.1-7.0.1.el9_7_fips, 2:3.5.1-7.0.1.ksplice1.el10_1, 2:3.5.1-7.0.1.ksplice1.el9_7, 3.0.11-1~deb12u2+sp999, 3.0.13-0ubuntu3.4+sp999, 3.0.13-0ubuntu3.7, 3.0.18-1~deb12u2, 3.0.18-2.ph4, 3.0.18-2.ph5, 3.0.19-r0, 3.0.2-0ubuntu1.21, 3.0.2-0ubuntu1.21+Fips1, 3.3.5-2, 3.3.6-r0, 3.5.3-1ubuntu3, 3.5.4-1~deb13u2, 3.5.5-1, 3.5.5-1ubuntu1, 3.5.5-r0, 3.6.1-r0, 3.0.19, 3.3.6, 3.4.4, 3.5.5, 3.6.1

OpenSSL_jll

3.0.20+0, 3.5.5+0

openssl-3

3.0.8-150400.4.78.1, 3.0.8-150500.5.57.1, 3.1.4-11.1, 3.1.4-150600.5.42.1, 3.1.4-slfo.1.1_8.1, 3.2.3-150700.5.24.1, 3.5.0-160000.5.1, 3.5.3-2.1

openssl-3-doc

3.1.4-150600.5.42.1, 3.5.0-160000.5.1, 3.5.3-2.1

openssl-3-livepatches

0.3-160000.1.1, 0.4-150600.13.11.1, 0.4-150700.16.6.1, 0.4-slfo.1.1_1.1

openssl-3-x86_64-v3-livepatches

0.3-160000.1.1

openssl-3.0

3.0.20-r0

openssl-c_rehash

3.0.18-2.ph4, 3.0.18-2.ph5

openssl-devel

1:3.2.2-1.amzn2023.0.4, 1:3.5.1-7.0.1.el10_1, 1:3.5.1-7.0.1.el9_7, 10:3.5.1-7.0.1.el9_7_fips, 2:3.5.1-7.0.1.ksplice1.el10_1, 2:3.5.1-7.0.1.ksplice1.el9_7, 3.0.18-2.ph4, 3.0.18-2.ph5

openssl-docs

3.0.18-2.ph4, 3.0.18-2.ph5

Timeline

  1. Publicly disclosed

    Jan 27, 2026

  2. Last updated

    Oct 16, 2026

Weakness Type

  • CWE-120 Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
  • CWE-787 Out-of-bounds Write

References

15 more references in the full CVE brief

FAQ

Common Questions.

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