CVE-2025-26465
OpenSSH DNS Host Key Verification Denial of Service
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.
INFO
Published Date :
Feb. 18, 2025, 7:15 p.m.
Last Modified :
March 3, 2025, 6:15 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
5.2
Exploitability Score :
1.6
Public PoC/Exploit Available at Github
CVE-2025-26465 has a 3 public PoC/Exploit
available at Github.
Go to the Public Exploits
tab to see the list.
Affected Products
The following products are affected by CVE-2025-26465
vulnerability.
Even if cvefeed.io
is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-26465
.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Patch Manual para a correção das CVE-2025-26465-e-CVE-2025-26466, para sistemas sem update do OpenSSH
Shell
MitM attack allowing a malicious interloper to impersonate a legitimate server when a client attempts to connect to it
cyber-security ssh vulnerability
None
Python
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-26465
vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-26465
vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 06, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:openbsd:openssh:6.8:p1:*:*:*:*:*:* *cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:* versions from (including) 6.9 from (including) 9.8 *cpe:2.3:a:openbsd:openssh:9.9:-:*:*:*:*:*:* *cpe:2.3:a:openbsd:openssh:9.9:p1:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* *cpe:2.3:a:redhat:openshift_container_platform:4.0:*:*:*:*:*:*:* *cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:* *cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* *cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* *cpe:2.3:a:netapp:ontap:9:*:*:*:*:*:*:* Added Reference Type Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2025-26465 Types: Third Party Advisory Added Reference Type CVE: https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466 Types: Third Party Advisory Added Reference Type Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2344780 Types: Issue Tracking, Third Party Advisory Added Reference Type CVE: https://bugzilla.suse.com/show_bug.cgi?id=1237040 Types: Issue Tracking Added Reference Type CVE: https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sig Types: Patch Added Reference Type CVE: https://lists.debian.org/debian-lts-announce/2025/02/msg00020.html Types: Third Party Advisory Added Reference Type CVE: https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.html Types: Third Party Advisory Added Reference Type CISA-ADP: https://seclists.org/oss-sec/2025/q1/144 Types: Mailing List, Third Party Advisory Added Reference Type CVE: https://security.netapp.com/advisory/ntap-20250228-0003/ Types: Third Party Advisory Added Reference Type CVE: https://security-tracker.debian.org/tracker/CVE-2025-26465 Types: Third Party Advisory Added Reference Type CVE: https://ubuntu.com/security/CVE-2025-26465 Types: Third Party Advisory Added Reference Type CVE: https://www.openssh.com/releasenotes.html#9.9p2 Types: Release Notes Added Reference Type CVE: https://www.openwall.com/lists/oss-security/2025/02/18/1 Types: Mailing List, Third Party Advisory Added Reference Type CVE: https://www.openwall.com/lists/oss-security/2025/02/18/4 Types: Mailing List, Third Party Advisory Added Reference Type CVE: https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/ Types: Press/Media Coverage Added Reference Type CVE: https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-openssh Types: Third Party Advisory Added Reference Type CVE: https://www.vicarius.io/vsociety/posts/cve-2025-26465-mitigate-vulnerable-openssh Types: Mitigation, Third Party Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Mar. 03, 2025
Action Type Old Value New Value Added Reference https://www.vicarius.io/vsociety/posts/cve-2025-26465-detect-vulnerable-openssh Added Reference https://www.vicarius.io/vsociety/posts/cve-2025-26465-mitigate-vulnerable-openssh -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Feb. 28, 2025
Action Type Old Value New Value Added Reference https://security.netapp.com/advisory/ntap-20250228-0003/ -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Feb. 19, 2025
Action Type Old Value New Value Added Reference https://seclists.org/oss-sec/2025/q1/144 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Feb. 19, 2025
Action Type Old Value New Value Added Reference https://blog.qualys.com/vulnerabilities-threat-research/2025/02/18/qualys-tru-discovers-two-vulnerabilities-in-openssh-cve-2025-26465-cve-2025-26466 Added Reference https://bugzilla.suse.com/show_bug.cgi?id=1237040 Added Reference https://ftp.openbsd.org/pub/OpenBSD/patches/7.6/common/008_ssh.patch.sig Added Reference https://lists.mindrot.org/pipermail/openssh-unix-announce/2025-February/000161.html Added Reference https://security-tracker.debian.org/tracker/CVE-2025-26465 Added Reference https://ubuntu.com/security/CVE-2025-26465 Added Reference https://www.openssh.com/releasenotes.html#9.9p2 Added Reference https://www.openwall.com/lists/oss-security/2025/02/18/1 Added Reference https://www.openwall.com/lists/oss-security/2025/02/18/4 Added Reference https://www.theregister.com/2025/02/18/openssh_vulnerabilities_mitm_dos/ -
New CVE Received by [email protected]
Feb. 18, 2025
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N Added CWE CWE-390 Added Reference https://access.redhat.com/security/cve/CVE-2025-26465 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2344780 -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Feb. 18, 2025
Action Type Old Value New Value Added Reference https://lists.debian.org/debian-lts-announce/2025/02/msg00020.html
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-26465
is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-26465
weaknesses.