{"id":"CVE-2025-15467","published":"2026-01-27T16:01:19Z","modified":"2026-10-15T01:02:38Z","title":"Stack buffer overflow in CMS (Auth)EnvelopedData parsing","vendor":"OpenSSL","product":"OpenSSL","tier":"core","eol":null,"affectedVersions":[{"vendor":"OpenSSL","product":"OpenSSL","versions":[">= 3.6.0, < 3.6.1",">= 3.5.0, < 3.5.5",">= 3.4.0, < 3.4.4",">= 3.3.0, < 3.3.6",">= 3.0.0, < 3.0.19"]}],"description":{"text":"Issue summary: Parsing CMS AuthEnvelopedData or EnvelopedData message with\nmaliciously crafted AEAD parameters can trigger a stack buffer overflow.\n\nImpact summary: A stack buffer overflow may lead to a crash, causing Denial\nof Service, or potentially remote code execution.\n\nWhen parsing CMS (Auth)EnvelopedData structures that use AEAD ciphers such as\nAES-GCM, the IV (Initialization Vector) encoded in the ASN.1 parameters is\ncopied into a fixed-size stack buffer without verifying that its length fits\nthe destination. An attacker can supply a crafted CMS message with an\noversized IV, causing a stack-based out-of-bounds write before any\nauthentication or tag verification occurs.\n\nApplications and services that parse untrusted CMS or PKCS#7 content using\nAEAD ciphers (e.g., S/MIME (Auth)EnvelopedData with AES-GCM) are vulnerable.\nBecause the overflow occurs prior to authentication, no valid key material\nis required to trigger it. While exploitability to remote code execution\ndepends on platform and toolchain mitigations, the stack-based write\nprimitive represents a severe risk.\n\nThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this\nissue, as the CMS implementation is outside the OpenSSL FIPS module\nboundary.\n\nOpenSSL 3.6, 3.5, 3.4, 3.3 and 3.0 are vulnerable to this issue.\n\nOpenSSL 1.1.1 and 1.0.2 are not affected by this issue.","provenance":"source","from":"CVE.org"},"summary":{"text":"A stack buffer overflow exists in OpenSSL's CMS parsing of (Auth)EnvelopedData messages that use AEAD ciphers such as AES-GCM, where the IV from the ASN.1 parameters is copied into a fixed-size stack buffer without a length check. An attacker can exploit it by supplying a crafted CMS message with an oversized IV to applications that parse untrusted CMS or PKCS#7 content, and it requires no valid key material and no user interaction, since the write happens before authentication.","provenance":"ai","model":"claude-haiku-5-5","generatedAt":"2026-10-29T07:11:57Z"},"cvss":{"score":8.8,"severity":"HIGH","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","provenance":"source","from":"CISA ADP Vulnrichment"},"epss":{"score":0.74793,"percentile":0.99503,"date":"2026-10-29","provenance":"source"},"kev":null,"vulncheckKev":null,"exploited":false,"otx":{"pulseCount":3,"pulses":[{"name":"ACTUALIZACION | Oracle Critical Patch Update Advisory - April 2026","url":"https://otx.alienvault.com/pulse/6a04aeed763730d81a39cece","created":"2026-05-13"},{"name":"VirusTotal report\n                    for executable.exe","url":"https://otx.alienvault.com/pulse/69f30ef4033560d49d39ac55","created":"2026-04-30"},{"name":"ACTUALIZACION | PSIRT | FortiGuard Labs","url":"https://otx.alienvault.com/pulse/69c17ac808a6b5bd8b760bcf","created":"2026-03-23"}],"provenance":"machine"},"cwes":[{"id":"CWE-787","name":"Out-of-bounds Write"},{"id":"CWE-120","name":"Buffer Copy without Checking Size of Input"}],"references":[{"url":"https://openssl-library.org/news/secadv/20260127.txt","tags":["vendor-advisory"]},{"url":"https://github.com/openssl/openssl/commit/2c8f0e5fa9b6ee5508a0349e4572ddb74db5a703","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/d0071a0799f20cc8101730145349ed4487c268dc","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/6ced0fe6b10faa560e410e3ee8d6c82f06c65ea3","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/5f26d4202f5b89664c5c3f3c62086276026ba9a9","tags":["patch"]},{"url":"https://github.com/openssl/openssl/commit/ce39170276daec87f55c39dad1f629b56344429e","tags":["patch"]},{"url":"http://www.openwall.com/lists/oss-security/2026/01/27/10","tags":[]},{"url":"http://www.openwall.com/lists/oss-security/2026/02/25/6","tags":[]},{"url":"https://github.com/guiimoraes/CVE-2025-15467","tags":["exploit"]},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-434797.html","tags":[]},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-734552.html","tags":[]},{"url":"https://access.redhat.com/security/cve/CVE-2025-15467","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2430376","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-15467.json","tags":["x_sadp-csaf-vex"]},{"url":"https://access.redhat.com/errata/RHSA-2026:3415","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:2974","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:4419","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:2659","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:2671","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:2072","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:2633","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:2077","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:6481","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:1496","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:1472","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:1733","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:1594","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:1519","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:1503","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:1473","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:3228","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:3461","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:3462","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:1736","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:7261","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:2485","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:2995","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:2844","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:4943","tags":["vendor-advisory","x_refsource_REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:2563","tags":["vendor-advisory","x_refsource_REDHAT"]}],"techniques":[],"reports":[],"affected":[],"advisories":[],"euvd":{"id":"EUVD-2025-206379","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2025-206379","exploited":false,"exploitedSince":null,"provenance":"source"},"exploits":[],"exploitSources":{"pocGithub":{"count":4,"skipped":1,"earliest":"2026-01-28","earliestUrl":"https://github.com/balgan/CVE-2025-15467","repos":[{"name":"guiimoraes/CVE-2025-15467","url":"https://github.com/guiimoraes/CVE-2025-15467","stars":15,"created":"2026-01-30"},{"name":"balgan/CVE-2025-15467","url":"https://github.com/balgan/CVE-2025-15467","stars":8,"created":"2026-01-28"},{"name":"mr-r3b00t/CVE-2025-15467","url":"https://github.com/mr-r3b00t/CVE-2025-15467","stars":1,"created":"2026-02-03"},{"name":"materaj2/cve-2025-15467","url":"https://github.com/materaj2/cve-2025-15467","stars":0,"created":"2026-03-1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(CVE.org)","url":"https://www.cve.org/CVERecord?id=CVE-2025-15467","provenance":"source"},{"date":"2026-01-28","kind":"exploit-public","label":"First public exploit: PoC-in-GitHub","url":"https://github.com/balgan/CVE-2025-15467","provenance":"source"}],"speed":{"daysToPublicExploit":1,"firstExploitFrom":"PoC-in-GitHub","daysToKev":null},"priority":{"score":32.4,"factors":[{"name":"In a KEV catalog","points":0.0,"detail":"not listed"},{"name":"Recent KEV listing","points":0.0,"detail":"not listed"},{"name":"Known ransomware use","points":0.0,"detail":"not known"},{"name":"EPSS percentile","points":19.9,"detail":"percentile 0.9950"},{"name":"Named in threat reports","points":0.0,"detail":"0 reports"},{"name":"Public exploit code","points":5.0,"detail":"1 NVD reference tagged Exploit; 4 PoC-in-GitHub repos"},{"name":"Mentioned in OTX pulses","points":1.37,"detail":"3 pulses"},{"name":"CVSS severity","points":6.16,"detail":"base score 8.8"},{"name":"End-of-life product","points":0.0,"detail":"supported or unknown"}]}}