CVE-2025-15467 (GCVE-0-2025-15467)

Vulnerability from cvelistv5 – Published: 2026-01-27 16:01 – Updated: 2026-03-20 03:55
VLAI?
Title
Stack buffer overflow in CMS (Auth)EnvelopedData parsing
Summary
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.
Severity ?
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.6.0 , < 3.6.1 (semver)
Affected: 3.5.0 , < 3.5.5 (semver)
Affected: 3.4.0 , < 3.4.4 (semver)
Affected: 3.3.0 , < 3.3.6 (semver)
Affected: 3.0.0 , < 3.0.19 (semver)
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Date Public ?
2026-01-27 14:00
Credits
Stanislav Fort (Aisle Research) Igor Ustinov
Show details on NVD website
To clipboard 

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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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: Parsing CMS AuthEnvelopedData or EnvelopedData message with\u003cbr\u003emaliciously crafted AEAD parameters can trigger a stack buffer overflow.\u003cbr\u003e\u003cbr\u003eImpact summary: A stack buffer overflow may lead to a crash, causing Denial\u003cbr\u003eof Service, or potentially remote code execution.\u003cbr\u003e\u003cbr\u003eWhen parsing CMS (Auth)EnvelopedData structures that use AEAD ciphers such as\u003cbr\u003eAES-GCM, the IV (Initialization Vector) encoded in the ASN.1 parameters is\u003cbr\u003ecopied into a fixed-size stack buffer without verifying that its length fits\u003cbr\u003ethe destination. An attacker can supply a crafted CMS message with an\u003cbr\u003eoversized IV, causing a stack-based out-of-bounds write before any\u003cbr\u003eauthentication or tag verification occurs.\u003cbr\u003e\u003cbr\u003eApplications and services that parse untrusted CMS or PKCS#7 content using\u003cbr\u003eAEAD ciphers (e.g., S/MIME (Auth)EnvelopedData with AES-GCM) are vulnerable.\u003cbr\u003eBecause the overflow occurs prior to authentication, no valid key material\u003cbr\u003eis required to trigger it. While exploitability to remote code execution\u003cbr\u003edepends on platform and toolchain mitigations, the stack-based write\u003cbr\u003eprimitive represents a severe risk.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this\u003cbr\u003eissue, as the CMS implementation is outside the OpenSSL FIPS module\u003cbr\u003eboundary.\u003cbr\u003e\u003cbr\u003eOpenSSL 3.6, 3.5, 3.4, 3.3 and 3.0 are vulnerable to this issue.\u003cbr\u003e\u003cbr\u003eOpenSSL 1.1.1 and 1.0.2 are not affected by this issue.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-02-25T17:44:51.846Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-15467\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-20T03:55:41.609Z\", \"dateReserved\": \"2026-01-06T09:26:41.631Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-01-27T16:01:19.922Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Taxonomy of the tags.




Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.