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CVE-2025-15467— Stack buffer overflow in CMS (Auth)EnvelopedData parsing

Quick assessment

Affected
OpenSSL OpenSSL
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL存在安全漏洞，该漏洞源于解析CMS AuthEnvelopedData消息时对AEAD参数处理不当，可能导致栈缓冲区溢出。以下版本受到影响：3.6版本、3.5版本、3.4版本、3.3版本和3.0版本。

AI Predicted 8.6 Difficulty: Hard EPSS 52.45% · P99

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 5

VendorProduct Version RangeStatus
OpenSSL OpenSSL 3.6.0< 3.6.1 affected
3.5.0< 3.5.5 affected
3.4.0< 3.4.4 affected
3.3.0< 3.3.6 affected
3.0.0< 3.0.19 affected
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I. Basic Information for CVE-2025-15467

Vulnerability Information
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Vulnerability Title
Stack buffer overflow in CMS (Auth)EnvelopedData parsing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
OpenSSL 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
OpenSSL是OpenSSL团队的一个开源的能够实现安全套接层（SSLv2/v3）和安全传输层（TLSv1）协议的通用加密库。该产品支持多种加密算法，包括对称密码、哈希算法、安全散列算法等。 OpenSSL存在安全漏洞，该漏洞源于解析CMS AuthEnvelopedData消息时对AEAD参数处理不当，可能导致栈缓冲区溢出。以下版本受到影响：3.6版本、3.5版本、3.4版本、3.3版本和3.0版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
OpenSSL OpenSSL 3.6.0 ~ 3.6.1 -

II. Public POCs for CVE-2025-15467

# POC Description Source Link Shenlong Link
1 Working DoS for CVE-2025-15467 and a docker container to test against https://github.com/balgan/CVE-2025-15467 POC Details
2 Command Execution PoC for OpenSSL Stack buffer overflow CVE-2025-15467 https://github.com/guiimoraes/CVE-2025-15467 POC Details
3 None https://github.com/MAXI8594/CVE-2025-15467_Scan POC Details
4 discovery tool (powershell) https://github.com/mr-r3b00t/CVE-2025-15467 POC Details
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III. Intelligence Information for CVE-2025-15467

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Patches & Fixes for CVE-2025-15467 (1)

Vendor Advisories for CVE-2025-15467 (1)

Same Patch Batch · OpenSSL · 2026-01-27 · 12 CVEs total

CVE-2026-22795 Missing ASN1_TYPE validation in PKCS#12 parsing
CVE-2026-22796 ASN1_TYPE Type Confusion in the PKCS7_digest_from_attributes() function
CVE-2025-15469 'openssl dgst' one-shot codepath silently truncates inputs >16MB
CVE-2025-15468 NULL dereference in SSL_CIPHER_find() function on unknown cipher ID
CVE-2025-66199 TLS 1.3 CompressedCertificate excessive memory allocation
CVE-2025-68160 Heap out-of-bounds write in BIO_f_linebuffer on short writes
CVE-2025-11187 Improper validation of PBMAC1 parameters in PKCS#12 MAC verification
CVE-2025-69421 NULL Pointer Dereference in PKCS12_item_decrypt_d2i_ex function
CVE-2025-69420 Missing ASN1_TYPE validation in TS_RESP_verify_response() function
CVE-2025-69419 Out of bounds write in PKCS12_get_friendlyname() UTF-8 conversion
CVE-2025-69418 Unauthenticated/unencrypted trailing bytes with low-level OCB function calls

IV. Related Vulnerabilities

Same product: OpenSSL
Same vendor: OpenSSL
Same weakness: CWE-787

V. Comments for CVE-2025-15467

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