CVE•Published 2025-02-18•Modified 2026-05-12•1 article on news•7 live references•NVD data

CVE-2025-26465Openbsd · Openssh

Vulnerability data via NVD (ingested)

CVSS v3.1

6.8

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

EPSS percentile

Exploit Prediction Scoring System · top 1% of all CVEs

Weaknesses (CWE)

CWE-390Detection of Error Condition Without Action

Description

A vulnerability was found in OpenSSH when the VerifyHostKeyDNS option is enabled. A machine-in-the-middle attack can be performed by a malicious machine impersonating a legit server. This issue occurs due to how OpenSSH mishandles error codes in specific conditions when verifying the host key. For an attack to be considered successful, the attacker needs to manage to exhaust the client's memory resource first, turning the attack complexity high.

Timeline

Published 2025-02-18

Modified 2026-05-12

External references

NVD MITRE Exploit-DB GitHub PoC Sploitus trickest/cve VulnCheck

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 tag8,628,472 hosts

vuln:CVE-2025-26465

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Openbsd Openssh"

All exposed Openbsd Openssh instances — cross-reference with the CVE's affected-version range.

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-2025-26465