CVE-2025-69420

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 TSRESPverify_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 osslessgetsigningcert() and osslessgetsigningcertv2() access the signing cert attribute value without validating its type. When the type is not VASN1SEQUENCE, this results in accessing invalid memory through the ASN1TYPE 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.

References

Affected packages

Git / github.com/openssl/openssl

Affected ranges

Type: GIT
Repo: https://github.com/openssl/openssl
Events: Introduced

0 Unknown introduced commit / All previous commits are affected

Fixed

27c7012c91cc986a598d7540f3079dfde2416eb9

Fixed

4e254b48ad93cc092be3dd62d97015f33f73133a

Fixed

564fd9c73787f25693bf9e75faf7bf6bb1305d4e

Fixed

5eb0770ffcf11b785cf374ff3c19196245e54f1b

Fixed

a99349ebfc519999edc50620abe24d599b9eb085

Affected versions

3.*

3.0-POST-CLANG-FORMAT-WEBKIT

3.0-PRE-CLANG-FORMAT-WEBKIT

3.3-POST-CLANG-FORMAT-WEBKIT

3.3-PRE-CLANG-FORMAT-WEBKIT

3.4-POST-CLANG-FORMAT-WEBKIT

3.4-PRE-CLANG-FORMAT-WEBKIT

3.5-POST-CLANG-FORMAT-WEBKIT

3.5-PRE-CLANG-FORMAT-WEBKIT

3.6-POST-CLANG-FORMAT-WEBKIT

3.6-PRE-CLANG-FORMAT-WEBKIT

Other

BEFORE_engine

OpenSSL_0_9_1c

OpenSSL_0_9_2b

OpenSSL_0_9_3

OpenSSL_0_9_3a

OpenSSL_0_9_3beta2

OpenSSL_0_9_4

OpenSSL_0_9_5a

OpenSSL_0_9_5a-beta1

OpenSSL_0_9_5a-beta2

OpenSSL_0_9_5beta1

OpenSSL_0_9_5beta2

OpenSSL_0_9_6-beta3

OpenSSL_1_1_0-pre1

OpenSSL_1_1_0-pre2

OpenSSL_1_1_0-pre3

OpenSSL_1_1_0-pre4

OpenSSL_1_1_0-pre5

OpenSSL_1_1_0-pre6

OpenSSL_1_1_1

OpenSSL_1_1_1-pre1

OpenSSL_1_1_1-pre2

OpenSSL_1_1_1-pre3

OpenSSL_1_1_1-pre4

OpenSSL_1_1_1-pre5

OpenSSL_1_1_1-pre6

OpenSSL_1_1_1-pre7

OpenSSL_1_1_1-pre8

OpenSSL_1_1_1-pre9

master-post-auto-reformat

master-post-reformat

master-pre-auto-reformat

master-pre-reformat

openssl-3.*

openssl-3.0.0

openssl-3.0.0-alpha1

openssl-3.0.0-alpha10

openssl-3.0.0-alpha11

openssl-3.0.0-alpha12

openssl-3.0.0-alpha13

openssl-3.0.0-alpha14

openssl-3.0.0-alpha15

openssl-3.0.0-alpha16

openssl-3.0.0-alpha17

openssl-3.0.0-alpha2

openssl-3.0.0-alpha3

openssl-3.0.0-alpha4

openssl-3.0.0-alpha5

openssl-3.0.0-alpha6

openssl-3.0.0-alpha7

openssl-3.0.0-alpha8

openssl-3.0.0-alpha9

openssl-3.0.0-beta1

openssl-3.0.0-beta2

openssl-3.0.1

openssl-3.0.10

openssl-3.0.11

openssl-3.0.12

openssl-3.0.13

openssl-3.0.14

openssl-3.0.15

openssl-3.0.16

openssl-3.0.17

openssl-3.0.18

openssl-3.0.2

openssl-3.0.3

openssl-3.0.4

openssl-3.0.5

openssl-3.0.6

openssl-3.0.7

openssl-3.0.8

openssl-3.0.9

openssl-3.2.0-alpha1

openssl-3.2.0-alpha2

openssl-3.3.0

openssl-3.3.0-alpha1

openssl-3.3.0-beta1

openssl-3.3.1

openssl-3.3.2

openssl-3.3.3

openssl-3.3.4

openssl-3.3.5

openssl-3.4.0

openssl-3.4.0-alpha1

openssl-3.4.0-beta1

openssl-3.4.1

openssl-3.4.2

openssl-3.4.3

openssl-3.5.0

openssl-3.5.0-alpha1

openssl-3.5.0-beta1

openssl-3.5.1

openssl-3.5.2

openssl-3.5.3

openssl-3.5.4

openssl-3.6.0

openssl-3.6.0-alpha1

openssl-3.6.0-beta1

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-69420.json"

vanir_signatures

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        "deprecated": false,
        "signature_type": "Line",
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    },
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    },
    {
        "source": "https://github.com/openssl/openssl/commit/564fd9c73787f25693bf9e75faf7bf6bb1305d4e",
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    },
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        "target": {
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        },
        "id": "CVE-2025-69420-5b510dc0"
    },
    {
        "source": "https://github.com/openssl/openssl/commit/27c7012c91cc986a598d7540f3079dfde2416eb9",
        "digest": {
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            "function_hash": "281745662143339069291279319188916354096"
        },
        "signature_version": "v1",
        "deprecated": false,
        "signature_type": "Function",
        "target": {
            "file": "crypto/ts/ts_rsp_verify.c",
            "function": "ossl_ess_get_signing_cert_v2"
        },
        "id": "CVE-2025-69420-81eb58fe"
    },
    {
        "source": "https://github.com/openssl/openssl/commit/4e254b48ad93cc092be3dd62d97015f33f73133a",
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        },
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    },
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        },
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    },
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        "source": "https://github.com/openssl/openssl/commit/5eb0770ffcf11b785cf374ff3c19196245e54f1b",
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        "deprecated": false,
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        "target": {
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        },
        "id": "CVE-2025-69420-c98920e1"
    },
    {
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    },
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    }
]