HOMEVULNERABILITIESCVE-2023-35784
CRITICAL

CVE-2023-35784

CWE-415Published: June 16, 2023· Updated: Jun 17, 2026

9.8
CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2023-35784 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors & Products

openbsd2 product(s)
libresslopenbsd
Source: NVD CPE · 3 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/026_ssl.patch.sig
PATCHhttps://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/004_ssl.patch.sig
PATCHhttps://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/026_ssl.patch.sig
PATCHhttps://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/004_ssl.patch.sig

All References (10)

→
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.6.3-relnotes.txtRelease Notes
→
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.7.3-relnotes.txtRelease Notes
→
https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/026_ssl.patch.sigPatch
→
https://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/004_ssl.patch.sigPatch
→
https://github.com/libressl/openbsd/commit/e42d8f4b21a8a498e2eabbffe4c7b7d4ef7cec54
→
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.6.3-relnotes.txtRelease Notes
→
https://ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.7.3-relnotes.txtRelease Notes
→
https://ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/026_ssl.patch.sigPatch
→
https://ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/004_ssl.patch.sigPatch
→
https://github.com/libressl/openbsd/commit/e42d8f4b21a8a498e2eabbffe4c7b7d4ef7cec54

Quick Facts

CVE IDCVE-2023-35784
CVSS Score9.8 / 10
SeverityCRITICAL
WeaknessCWE-415
CISA KEVNo
Affected1 vendor(s)
PublishedJun 16, 2023

Related CVEs (CWE-415)

CVE-2018-0101
10.0
CVE-2016-5768
9.8
CVE-2016-5772
9.8
CVE-2016-3132
9.8
CVE-2024-11704
9.8
CVE-2018-3593
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2023-35784 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
← All Vulnerabilities·Search for CVE-2023-35784·NVD