High severity · published Jan 27, 2026
CVE-2025-15467
Stack buffer overflow in CMS (Auth)EnvelopedData parsing
8.8
CVSS
74.8%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)74.8% · higher than 100% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenSSL · OpenSSL
3.6.0 before 3.6.1; 3.5.0 before 3.5.5; 3.4.0 before 3.4.4; 3.3.0 before 3.3.6; 3.0.0 before 3.0.19 · source: vendor, NVD
AL
AI Lightweight Inference Server · Siemens
0 · source: CISA
CF
Connector for Azure · Siemens
before V1.8.0 · source: CISA
CM
Cost Management 4 · Red Hat
All versions, or not specified · source: CISA
DA
Databus · Siemens
before V3.3.2 · source: CISA
DC
Desigo CC family V7 · Siemens
0 · source: CISA
DC
Desigo CC family V8 · Siemens
0 · source: CISA
DC
Desigo CC family V9 · Siemens
before V9.0 QU1 · source: CISA
HC
HiMed Cockpit · Siemens
0 · source: CISA
RR
RUGGEDCOM RM1224 LTE(4G) EU · Siemens
0 · source: CISA
RR
RUGGEDCOM RM1224 LTE(4G) NAM · Siemens
0 · source: CISA
RH
Red Hat AI Inference Server 3.2 · Red Hat
All versions, or not specified · source: CISA
In the news
VulnerabilityCritical
Siemens Desigo CC
View CSAF
Summary
OpenSSL has published a stack based buffer overflow vulnerability that allows a remote attacker to cause a denial of service (DoS) or potentially allow for remote code execution. Siemens has released new versions for several affected products and recommends to update to the latest versions. Siemens is preparing further fix versions and recommends countermeasures for products where fixes are not, or not yet available.
The following versions of Siemens Desigo CC are affected:
Desigo CC family V7 vers:all/* (CVE-2025-15467)
Desigo CC family V8 vers:all/* (CVE-2025-15467)
Desigo CC family V9 vers:intdot/<9.0.1 (CVE-2025-15467)
CVSS
Vendor
Equipment
Vulnerabilities
v3 9.8
Siemens
Siemens Desigo CC
Out-of-bounds Write
Background
Critical Infrastructure Sectors: Critical Manufacturing
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Germany
Vulnerabilities
Expand All +
CVE-2025-15467
Issue summary: Parsing CMS AuthEnvelopedData 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 AuthEnvelopedData 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 ...
Jul 28, 2026·CISA Advisories
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-15467
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-15467
Patch
https://github.com/openssl/openssl/commit/2c8f0e5fa9b6ee5508a0349e4572ddb74db5a703
Patch
https://github.com/openssl/openssl/commit/5f26d4202f5b89664c5c3f3c62086276026ba9a9
Patch
https://github.com/openssl/openssl/commit/6ced0fe6b10faa560e410e3ee8d6c82f06c65ea3
Patch
https://github.com/openssl/openssl/commit/ce39170276daec87f55c39dad1f629b56344429e
Patch
https://github.com/openssl/openssl/commit/d0071a0799f20cc8101730145349ed4487c268dc
Vendor Advisory
https://openssl-library.org/news/secadv/20260127.txt
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