CVE-2025-69420Missing ASN1_TYPE validation in TS_RESP_verify_response() function
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.5 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- CWE-754
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- openssl
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
OpenSSL OpenSSL openssl:openssl (from the name) | from 3.6.0 before 3.6.1; from 3.5.0 before 3.5.5; from 3.4.0 before 3.4.4; from 3.3.0 before 3.3.6; from 3.0.0 before 3.0.19; from 1.1.1 before 1.1.1ze | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
openssl openssl openssl:openssl | from 1.1.1 before 1.1.1ze; from 3.0.0 before 3.0.19; from 3.3.0 before 3.3.6; from 3.4.0 before 3.4.4; from 3.5.0 before 3.5.5; from 3.6.0 before 3.6.1 | NVD |
References
- https://openssl-library.org/news/secadv/20260127.txtvendor-advisory
- https://github.com/openssl/openssl/commit/a99349ebfc519999edc50620abe24d599b9eb085patch
- https://github.com/openssl/openssl/commit/564fd9c73787f25693bf9e75faf7bf6bb1305d4epatch
- https://github.com/openssl/openssl/commit/27c7012c91cc986a598d7540f3079dfde2416eb9patch
- https://github.com/openssl/openssl/commit/5eb0770ffcf11b785cf374ff3c19196245e54f1bpatch
- https://github.com/openssl/openssl/commit/4e254b48ad93cc092be3dd62d97015f33f73133apatch
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.