{"cve":"CVE-2025-69420","nvd":{"published":"2026-01-27T16:16:34.317","modified":"2026-06-17T10:00:40.067","status":"Modified","description":"Issue summary: A type confusion vulnerability exists in the TimeStamp Response\nverification code where an ASN1_TYPE union member is accessed without first\nvalidating the type, causing an invalid or NULL pointer dereference when\nprocessing a malformed TimeStamp Response file.\n\nImpact summary: An application calling TS_RESP_verify_response() with a\nmalformed TimeStamp Response can be caused to dereference an invalid or\nNULL pointer when reading, resulting in a Denial of Service.\n\nThe functions ossl_ess_get_signing_cert() and ossl_ess_get_signing_cert_v2()\naccess the signing cert attribute value without validating its type.\nWhen the type is not V_ASN1_SEQUENCE, this results in accessing invalid memory\nthrough the ASN1_TYPE union, causing a crash.\n\nExploiting this vulnerability requires an attacker to provide a malformed\nTimeStamp Response to an application that verifies timestamp responses. The\nTimeStamp protocol (RFC 3161) is not widely used and the impact of the\nexploit is just a Denial of Service. 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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-754"],"references":["https://github.com/openssl/openssl/commit/27c7012c91cc986a598d7540f3079dfde2416eb9","https://github.com/openssl/openssl/commit/4e254b48ad93cc092be3dd62d97015f33f73133a","https://github.com/openssl/openssl/commit/564fd9c73787f25693bf9e75faf7bf6bb1305d4e","https://github.com/openssl/openssl/commit/5eb0770ffcf11b785cf374ff3c19196245e54f1b","https://github.com/openssl/openssl/commit/a99349ebfc519999edc50620abe24d599b9eb085"],"products":["openssl:openssl"],"source":"nvd","synced_at":"2026-10-19T22:21:16.563232421+00:00"},"epss":{"cve":"CVE-2025-69420","score":0.0092,"percentile":0.60291,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}