Double Free in OpenBSD Libressl
CVE-2023-35784
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.
Vulnerability class: Double Free
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.009 (59.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 59.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: -0.000
Affected products
- OpenBSD Libressl
- OpenBSD — versions 7.2, 7.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
- ftp.openbsd.org/pub/OpenBSD/patches/7.3/common/004_ssl.patch.sig (Patch)
- ftp.openbsd.org/pub/OpenBSD/patches/7.2/common/026_ssl.patch.sig (Patch)
- ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.6.3-relnotes.txt (Release Notes)
- ftp.openbsd.org/pub/OpenBSD/LibreSSL/libressl-3.7.3-relnotes.txt (Release Notes)
- github.com/libressl/openbsd/commit/e42d8f4b21a8a498e2eabbffe4c7b7d4ef7cec54
Frequently asked questions
- What is CVE-2023-35784?
- CVE-2023-35784 is a critical-severity vulnerability in OpenBSD Libressl, classified under Double Free. CVSS score: 9.8/10. Published 2023-06-16.
- How severe is CVE-2023-35784?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2023-35784 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.