CVE-2023-35784

CRITICALNVD 9.89.8—

9.8

A double free or use after free could occur after SSL_clear in OpenBSD 7.2 before errata 026 and 7.3 before errata 004, and in LibreSSL before 3.6.3 and 3.7.x before 3.7.3. NOTE: OpenSSL is not affected.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 36.0%
KEV: Not listed

Published

June 16, 2023

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated May 25, 2026

Upstream fix merged — awaiting tagged release. Sources: github_commit.

github_commit

commit e42d8f4b21a8 (libressl/openbsd)

Fix landed in libressl/openbsd commit e42d8f4b21a8 — awaiting tagged release

https://github.com/libressl/openbsd/commit/e42d8f4b21a8a498e2eabbffe4c7b7d4ef7cec54

generic

https://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/004_ssl.patch.sig

generic

https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/026_ssl.patch.sig

generic

https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.7.3-relnotes.txt

generic

https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.6.3-relnotes.txt

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 14× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
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2026-05-31 22:30 UTCepss_batch
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2026-05-31 00:15 UTCepss_batch
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2026-05-29 13:43 UTCepss_batch
2026-05-29 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
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2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch

Frequently asked(5)

What is CVE-2023-35784?

CVE-2023-35784 is a critical vulnerability published on June 16, 2023. A double free or use after free could occur after SSL_clear in OpenBSD 7.2 before errata 026 and 7.3 before errata 004, and in LibreSSL before 3.6.3 and 3.7.x before 3.7.3. NOTE: OpenSSL is not affected.

When was CVE-2023-35784 disclosed?

CVE-2023-35784 was first published in the National Vulnerability Database on June 16, 2023, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-35784 actively exploited?

CVE-2023-35784 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 36.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-35784?

CVE-2023-35784 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2023-35784?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-35784, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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CVE-2023-35784

📅 Published

🔄 Last Modified

📋 Advisory Details (5)

commit e42d8f4b21a8 (libressl/openbsd)

Weakness Classification(2)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-35784?

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Frequently asked(5)

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