CVE-2025-69420 (GCVE-0-2025-69420)

Vulnerability from cvelistv5 – Published: 2026-01-27 16:01 – Updated: 2026-05-12 12:08
VLAI
Title
Missing ASN1_TYPE validation in TS_RESP_verify_response() function
Summary
Issue summary: A type confusion vulnerability exists in the TimeStamp Response verification code where an ASN1_TYPE union member is accessed without first validating the type, causing an invalid or NULL pointer dereference when processing a malformed TimeStamp Response file. Impact summary: An application calling TS_RESP_verify_response() with a malformed TimeStamp Response can be caused to dereference an invalid or NULL pointer when reading, resulting in a Denial of Service. The functions ossl_ess_get_signing_cert() and ossl_ess_get_signing_cert_v2() access the signing cert attribute value without validating its type. When the type is not V_ASN1_SEQUENCE, this results in accessing invalid memory through the ASN1_TYPE union, causing a crash. Exploiting this vulnerability requires an attacker to provide a malformed TimeStamp Response to an application that verifies timestamp responses. The TimeStamp protocol (RFC 3161) is not widely used and the impact of the exploit is just a Denial of Service. For these reasons the issue was assessed as Low severity. The FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue, as the TimeStamp Response implementation is outside the OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue. OpenSSL 1.0.2 is not affected by this issue.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
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)
Affected: 1.1.1 , < 1.1.1ze (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
Create a notification for this product.
Date Public
2026-01-27 14:00
Credits
Luigino Camastra (Aisle Research) Bob Beck
Show details on NVD website
To clipboard 

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For these reasons the issue was\\nassessed as Low severity.\\n\\nThe FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,\\nas the TimeStamp Response implementation is outside the OpenSSL FIPS module\\nboundary.\\n\\nOpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue.\\n\\nOpenSSL 1.0.2 is not affected by this issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Issue summary: A type confusion vulnerability exists in the TimeStamp Response\u003cbr\u003everification code where an ASN1_TYPE union member is accessed without first\u003cbr\u003evalidating the type, causing an invalid or NULL pointer dereference when\u003cbr\u003eprocessing a malformed TimeStamp Response file.\u003cbr\u003e\u003cbr\u003eImpact summary: An application calling TS_RESP_verify_response() with a\u003cbr\u003emalformed TimeStamp Response can be caused to dereference an invalid or\u003cbr\u003eNULL pointer when reading, resulting in a Denial of Service.\u003cbr\u003e\u003cbr\u003eThe functions ossl_ess_get_signing_cert() and ossl_ess_get_signing_cert_v2()\u003cbr\u003eaccess the signing cert attribute value without validating its type.\u003cbr\u003eWhen the type is not V_ASN1_SEQUENCE, this results in accessing invalid memory\u003cbr\u003ethrough the ASN1_TYPE union, causing a crash.\u003cbr\u003e\u003cbr\u003eExploiting this vulnerability requires an attacker to provide a malformed\u003cbr\u003eTimeStamp Response to an application that verifies timestamp responses. The\u003cbr\u003eTimeStamp protocol (RFC 3161) is not widely used and the impact of the\u003cbr\u003eexploit is just a Denial of Service. For these reasons the issue was\u003cbr\u003eassessed as Low severity.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,\u003cbr\u003eas the TimeStamp Response implementation is outside the OpenSSL FIPS module\u003cbr\u003eboundary.\u003cbr\u003e\u003cbr\u003eOpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue.\u003cbr\u003e\u003cbr\u003eOpenSSL 1.0.2 is not affected by this issue.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-754\", \"description\": \"CWE-754 Improper Check for Unusual or Exceptional Conditions\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-01-27T16:01:25.643Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-69420\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-28T19:33:41.253Z\", \"dateReserved\": \"2026-01-06T12:44:09.945Z\", \"assignerOrgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"datePublished\": \"2026-01-27T16:01:25.643Z\", \"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.