CVE•Published 2023-02-03•Modified 2026-05-28•1 article on news•6 live references•NVD data
CVE-2023-25136Openbsd · Openssh
Vulnerability data via NVD (ingested)
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 percentile
100
Exploit Prediction Scoring System · top 0% of all CVEs
Weaknesses (CWE)
Description
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."
Timeline
Published 2023-02-03
Modified 2026-05-28
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag6,232 hosts
vuln:CVE-2023-25136Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product + version
product:"Openbsd Openssh" version:"9.1"Version-pinned fingerprint from NVD's first vulnerable CPE.
Shodan · banner/body mention
http.html:"Openssh"HTTP body or banner mentions "Openssh" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2023-25136Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2023-25136Censys host search filtered to this CVE id.
grep.app
CVE-2023-25136Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2023-25136GitHub code search for direct mentions.
Google dork
"CVE-2023-25136" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.