CVE-2025-69420 | Missing ASN1_TYPE validation in TS_RESP_verify_response() function

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.

Published: 2026-01-27 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-69420 is rated Moderate Risk (47.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.77%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-69420

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.13% 0.77% -0.36%
2 2026-05-29 0.50% 1.13% +0.63%
3 2026-05-13 — 0.50% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-69420

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-69420

GitHub Security Advisory for CVE-2025-69420

GHSA-w42r-ph9f-9x66 · Severity: high — Issue summary: A type confusion vulnerability exists in the TimeStamp Response verification code...

OS Trackers for CVE-2025-69420

vendor priority summary link
alpine — CVE-2025-69420: 1 source package rows (openssl); 147 state rows across 6 repos (3.19-main, 3.20-main, 3.21-main, 3.22-main, 3.23-main, edge-main); fixed 5, open 142. https://security.alpinelinux.org/vuln/CVE-2025-69420
debian not yet assigned CVE-2025-69420 not yet assigned priority: Debian including 1 source packages (openssl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2025-69420
redhat low — https://access.redhat.com/security/cve/CVE-2025-69420
suse medium CVE-2025-69420 severity moderate: SUSE including 468 source package names (1.1.1-1.15:libopenssl3-3.2.3-150700.5.24.1, 1.1.1-1.15:openssl-3-3.2.3-150700.5.24.1, …), 1499 product×package rows across 301 product lines (Container private-registry/harbor-core, Container private-registry/harbor-exporter, … (301 product lines)): Fixed 1172, Known Affected 231, Known Not Affected 89, First Fixed 7. https://www.suse.com/security/cve/CVE-2025-69420/
ubuntu low CVE-2025-69420 low priority: Ubuntu including 4 source packages (edk2, nodejs, openssl, openssl1.0), 32 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): not-affected 14, released 6, needs-triage 5, DNE 4, ignored 2, needed 1. https://ubuntu.com/security/CVE-2025-69420

Affected software / configurations for CVE-2025-69420

Vendor Product Version Raw CPE
openssl openssl >= 1.1.1, < 1.1.1ze cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl openssl >= 3.0.0, < 3.0.19 cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl openssl >= 3.3.0, < 3.3.6 cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl openssl >= 3.4.0, < 3.4.4 cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl openssl >= 3.5.0, < 3.5.5 cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*
openssl openssl >= 3.6.0, < 3.6.1 cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:*

References for CVE-2025-69420

cvelogic Threat Intelligence