CVE-2025-15467

CVE Enrichment

CVSS: 8.8 HIGH
EPSS: 52.45%
EPSS Percentile: 98.96%
CISA KEV: Not listed

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.

Technical Details

CVSS Version: 3.1
CNA / NVD Source: openssl-security@openssl.org
Published: 27-Jan-2026 23:16
Last Modified: 15-Oct-2026 09:17
EPSS Date: 2026-10-20
CWE: CWE-787, CWE-120

CVSS Vector


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

Affected Products / Versions

openssl / openssl
Version / affected range: * · from (inclusive) 3.0.0 · before (exclusive) 3.0.19
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl / openssl
Version / affected range: * · from (inclusive) 3.1.0 · before (exclusive) 3.3.6
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl / openssl
Version / affected range: * · from (inclusive) 3.4.0 · before (exclusive) 3.4.4
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl / openssl
Version / affected range: * · from (inclusive) 3.5.0 · before (exclusive) 3.5.5
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl / openssl
Version / affected range: * · from (inclusive) 3.6.0 · before (exclusive) 3.6.1
cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*

References

Last enrichment sync: 21-Oct-2026 15:13
Sources: NVD · FIRST EPSS · CISA KEV
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Reported Context (1)

Two critical-severity vulnerabilities also ranked among the least prevented. The OpenSSL CMS CVE-2025-15467 Picus Blue Report 2026 Finds Enterprise Defenses Block Just 37% of Post-Compromise Actions

CVE (9)

Malware (10)

Threat Actors (10)

MITRE ATT&CK (15)

Vendors (1)

Products (16)

Tools (3)

Industries (10)

Note: Related entities, including threat actors, malware, CVEs, MITRE ATT&CK techniques, vendors, products, tools, countries, and industries, are shown when they appear in the same reporting. Their presence does not necessarily mean they were targeted, compromised, vulnerable, responsible for the activity, or directly involved in the incident.