CVE-2025-69420

HIGH EPSS 50.9%
Published Jan 27, 20265mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published Jan 27, 2026 5mo ago
Last Modified Jun 17, 2026 2w ago

Description

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 Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
50.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-754

Affected Products 6

VendorProductVersionRange
opensslopenssl*≥1.1.1  –  <1.1.1ze
opensslopenssl*≥3.0.0  –  <3.0.19
opensslopenssl*≥3.3.0  –  <3.3.6
opensslopenssl*≥3.4.0  –  <3.4.4
opensslopenssl*≥3.5.0  –  <3.5.5
opensslopenssl*≥3.6.0  –  <3.6.1

References 7

  • cert-portal.siemens.com https://cert-portal.siemens.com/productcert/html/ssa-265688.html
  • github.com https://github.com/openssl/openssl/commit/27c7012c91cc986a598d7540f3079dfde2416eb9
    Patch
  • github.com https://github.com/openssl/openssl/commit/4e254b48ad93cc092be3dd62d97015f33f73133a
    Patch
  • github.com https://github.com/openssl/openssl/commit/564fd9c73787f25693bf9e75faf7bf6bb1305d4e
    Patch
  • github.com https://github.com/openssl/openssl/commit/5eb0770ffcf11b785cf374ff3c19196245e54f1b
    Patch
  • github.com https://github.com/openssl/openssl/commit/a99349ebfc519999edc50620abe24d599b9eb085
    Patch
  • openssl-library.org https://openssl-library.org/news/secadv/20260127.txt
    Vendor Advisory

Remediation

  • github.com https://github.com/openssl/openssl/commit/27c7012c91cc986a598d7540f3079dfde2416eb9
    Patch
  • github.com https://github.com/openssl/openssl/commit/4e254b48ad93cc092be3dd62d97015f33f73133a
    Patch
  • github.com https://github.com/openssl/openssl/commit/564fd9c73787f25693bf9e75faf7bf6bb1305d4e
    Patch
  • github.com https://github.com/openssl/openssl/commit/5eb0770ffcf11b785cf374ff3c19196245e54f1b
    Patch
  • github.com https://github.com/openssl/openssl/commit/a99349ebfc519999edc50620abe24d599b9eb085
    Patch