Stack buffer overflow in CMS (Auth)EnvelopedData parsing

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Summary

CVECVE-2025-15467
StatePUBLISHED
Assigneropenssl
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-27 16:16:14 UTC
Updated2026-05-07 18:12:43 UTC
DescriptionIssue 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from ADP

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

Problem Types: CWE-787 | CWE-787 CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Openssl Openssl All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenSSL OpenSSL affected 3.6.0 3.6.1 semver Not specified
CNA OpenSSL OpenSSL affected 3.5.0 3.5.5 semver Not specified
CNA OpenSSL OpenSSL affected 3.4.0 3.4.4 semver Not specified
CNA OpenSSL OpenSSL affected 3.3.0 3.3.6 semver Not specified
CNA OpenSSL OpenSSL affected 3.0.0 3.0.19 semver Not specified

References

ReferenceSourceLinkTags
github.com/guiimoraes/CVE-2025-15467 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com Exploit, Third Party Advisory
github.com/openssl/openssl/commit/6ced0fe6b10faa560e410e3ee8d6c82f06c65ea3 [email protected] github.com Patch
github.com/openssl/openssl/commit/ce39170276daec87f55c39dad1f629b56344429e [email protected] github.com Patch
github.com/openssl/openssl/commit/5f26d4202f5b89664c5c3f3c62086276026ba9a9 [email protected] github.com Patch
openssl-library.org/news/secadv/20260127.txt [email protected] openssl-library.org Vendor Advisory
github.com/openssl/openssl/commit/d0071a0799f20cc8101730145349ed4487c268dc [email protected] github.com Patch
www.openwall.com/lists/oss-security/2026/01/27/10 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List
www.openwall.com/lists/oss-security/2026/02/25/6 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com Mailing List
github.com/openssl/openssl/commit/2c8f0e5fa9b6ee5508a0349e4572ddb74db5a703 [email protected] github.com Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Stanislav Fort (Aisle Research) (en)

CNA: Igor Ustinov (en)

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