CVE-2025-11187 (GCVE-0-2025-11187)

Vulnerability from cvelistv5 – Published: 2026-01-27 15:59 – Updated: 2026-03-20 14:07
VLAI
Title
Improper validation of PBMAC1 parameters in PKCS#12 MAC verification
Summary
Issue summary: PBMAC1 parameters in PKCS#12 files are missing validation which can trigger a stack-based buffer overflow, invalid pointer or NULL pointer dereference during MAC verification. Impact summary: The stack buffer overflow or NULL pointer dereference may cause a crash leading to Denial of Service for an application that parses untrusted PKCS#12 files. The buffer overflow may also potentially enable code execution depending on platform mitigations. When verifying a PKCS#12 file that uses PBMAC1 for the MAC, the PBKDF2 salt and keylength parameters from the file are used without validation. If the value of keylength exceeds the size of the fixed stack buffer used for the derived key (64 bytes), the key derivation will overflow the buffer. The overflow length is attacker-controlled. Also, if the salt parameter is not an OCTET STRING type this can lead to invalid or NULL pointer dereference. Exploiting this issue requires a user or application to process a maliciously crafted PKCS#12 file. It is uncommon to accept untrusted PKCS#12 files in applications as they are usually used to store private keys which are trusted by definition. For this reason the issue was assessed as Moderate severity. The FIPS modules in 3.6, 3.5 and 3.4 are not affected by this issue, as PKCS#12 processing is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5 and 3.4 are vulnerable to this issue. OpenSSL 3.3, 3.0, 1.1.1 and 1.0.2 are not affected by this issue as they do not support PBMAC1 in PKCS#12.
Severity
6.1 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
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)
Create a notification for this product.
Date Public
2026-01-27 14:00
Credits
Stanislav Fort (Aisle Research) Petr Šimeček (Aisle Research) Hamza (Metadust) Tomáš Mráz
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The buffer overflow may also potentially enable\\ncode execution depending on platform mitigations.\\n\\nWhen verifying a PKCS#12 file that uses PBMAC1 for the MAC, the PBKDF2\\nsalt and keylength parameters from the file are used without validation.\\nIf the value of keylength exceeds the size of the fixed stack buffer used\\nfor the derived key (64 bytes), the key derivation will overflow the buffer.\\nThe overflow length is attacker-controlled. Also, if the salt parameter is\\nnot an OCTET STRING type this can lead to invalid or NULL pointer\\ndereference.\\n\\nExploiting this issue requires a user or application to process\\na maliciously crafted PKCS#12 file. It is uncommon to accept untrusted\\nPKCS#12 files in applications as they are usually used to store private\\nkeys which are trusted by definition. For this reason the issue was assessed\\nas Moderate severity.\\n\\nThe FIPS modules in 3.6, 3.5 and 3.4 are not affected by this issue, as\\nPKCS#12 processing is outside the OpenSSL FIPS module boundary.\\n\\nOpenSSL 3.6, 3.5 and 3.4 are vulnerable to this issue.\\n\\nOpenSSL 3.3, 3.0, 1.1.1 and 1.0.2 are not affected by this issue as they do\\nnot support PBMAC1 in PKCS#12.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: PBMAC1 parameters in PKCS#12 files are missing validation\u003cbr\u003ewhich can trigger a stack-based buffer overflow, invalid pointer or NULL\u003cbr\u003epointer dereference during MAC verification.\u003cbr\u003e\u003cbr\u003eImpact summary: The stack buffer overflow or NULL pointer dereference may\u003cbr\u003ecause a crash leading to Denial of Service for an application that parses\u003cbr\u003euntrusted PKCS#12 files. The buffer overflow may also potentially enable\u003cbr\u003ecode execution depending on platform mitigations.\u003cbr\u003e\u003cbr\u003eWhen verifying a PKCS#12 file that uses PBMAC1 for the MAC, the PBKDF2\u003cbr\u003esalt and keylength parameters from the file are used without validation.\u003cbr\u003eIf the value of keylength exceeds the size of the fixed stack buffer used\u003cbr\u003efor the derived key (64 bytes), the key derivation will overflow the buffer.\u003cbr\u003eThe overflow length is attacker-controlled. Also, if the salt parameter is\u003cbr\u003enot an OCTET STRING type this can lead to invalid or NULL pointer\u003cbr\u003edereference.\u003cbr\u003e\u003cbr\u003eExploiting this issue requires a user or application to process\u003cbr\u003ea maliciously crafted PKCS#12 file. It is uncommon to accept untrusted\u003cbr\u003ePKCS#12 files in applications as they are usually used to store private\u003cbr\u003ekeys which are trusted by definition. For this reason the issue was assessed\u003cbr\u003eas Moderate severity.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.6, 3.5 and 3.4 are not affected by this issue, as\u003cbr\u003ePKCS#12 processing is outside the OpenSSL FIPS module boundary.\u003cbr\u003e\u003cbr\u003eOpenSSL 3.6, 3.5 and 3.4 are vulnerable to this issue.\u003cbr\u003e\u003cbr\u003eOpenSSL 3.3, 3.0, 1.1.1 and 1.0.2 are not affected by this issue as they do\u003cbr\u003enot support PBMAC1 in PKCS#12.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}, {\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-476\", \"description\": \"CWE-476 NULL Pointer Dereference\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-01-27T15:59:41.681Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-11187\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-20T14:07:14.610Z\", \"dateReserved\": \"2025-09-30T09:29:44.018Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-01-27T15:59:41.681Z\", \"assignerShortName\": \"openssl\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.