CVE-2023-25136
MEDIUM 6.5EPSS 89.7%
OpenSSH server (sshd) 9.1 introduced a double-free vulnerability during options.kex_algorithms handling. This is fixed in OpenSSH 9.2. The double free can be leveraged, by an unauthenticated remote attacker in the default configuration, to jump to any location in the sshd address space. One third-party report states "remote code execution is theoretically possible."
- CVSS v3.1
- 6.5 MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H - EPSS
- 89.69% chance of exploitation in the next 30 days, 100th percentile
- Published
- 2023-02-03
- Updated
- 2026-05-28
Proof-of-concept exploits (13)
- https://jfrog.com/blog/openssh-pre-auth-double-free-cve-2023-25136-writeup-and-proof-of-c…
- Business1sg00d/CVE-2023-251361★ · 2023-09-08
- Christbowel/CVE-2023-25136107★ · 2023-03-07
- H4K6/CVE-2023-251365★ · 2023-06-30
- adhikara13/CVE-2023-2513647★ · 2023-04-21
- axylisdead/CVE-2023-25136_POC3★ · 2023-07-05
- jfrog/jfrog-CVE-2023-25136-OpenSSH_Double-Free41★ · 2023-02-09
- malvika-thakur/CVE-2023-251363★ · 2023-09-21
- mrmtwoj/CVE-2023-251361★ · 2025-01-16
- nhakobyan685/CVE-2023-251368★ · 2023-04-28
- ticofookfook/CVE-2023-251363★ · 2023-02-14
- zacharimayer/ssh-exploit0★ · 2024-01-16
- Lane0218/CVE-2023-25136-PoC