CVE-2025-26466
OpenSSH Memory Consumption Denial of Service Vulnerability
Description
A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack.
INFO
Published Date :
Feb. 28, 2025, 10:15 p.m.
Last Modified :
March 21, 2025, 4:15 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
3.6
Exploitability Score :
2.2
Affected Products
The following products are affected by CVE-2025-26466
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.
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-2025-26466.
| URL | Resource |
|---|---|
| https://access.redhat.com/security/cve/CVE-2025-26466 | Third Party Advisory |
| https://bugzilla.redhat.com/show_bug.cgi?id=2345043 | Issue Tracking |
| https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt | Third Party Advisory |
| https://bugzilla.suse.com/show_bug.cgi?id=1237041 | Third Party Advisory |
| https://security-tracker.debian.org/tracker/CVE-2025-26466 | Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20250228-0002/ | Third Party Advisory |
| https://ubuntu.com/security/CVE-2025-26466 | Third Party Advisory |
| https://www.openwall.com/lists/oss-security/2025/02/18/1 | Mailing List Third Party Advisory |
| https://www.openwall.com/lists/oss-security/2025/02/18/4 | Mailing List Third Party Advisory |
| https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt | Third Party Advisory |
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-26466 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-26466 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.
-
CVE Modified by [email protected]
Mar. 21, 2025
Action Type Old Value New Value Added CWE CWE-770 Removed CWE CWE-400 -
Reanalysis by [email protected]
Mar. 06, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:canonical:ubuntu_linux:24.04:*:*:*:lts:*:*:* *cpe:2.3:o:canonical:ubuntu_linux:24.10:*:*:*:*:*:*:* Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:12.0:*:*:*:*:*:*:* *cpe:2.3:o:debian:debian_linux:13.0:*:*:*:*:*:*:* -
Initial Analysis by [email protected]
Mar. 06, 2025
Action Type Old Value New Value Added CWE CWE-770 Added CPE Configuration OR *cpe:2.3:a:openbsd:openssh:9.8:-:*:*:*:*:*:* *cpe:2.3:a:openbsd:openssh:9.9:-:*:*:*:*:*:* *cpe:2.3:a:openbsd:openssh:9.9:p1:*:*:*:*:*:* *cpe:2.3:a:openbsd:openssh:9.5:p1:*:*:*:*:*:* *cpe:2.3:a:openbsd:openssh:9.6:-:*:*:*:*:*:* *cpe:2.3:a:openbsd:openssh:9.6:p1:*:*:*:*:*:* *cpe:2.3:a:openbsd:openssh:9.7:-:*:*:*:*:*:* *cpe:2.3:a:openbsd:openssh:9.7:p1:*:*:*:*:*:* *cpe:2.3:a:openbsd:openssh:9.8:p1:*:*:*:*:*:* Added Reference Type Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2025-26466 Types: Third Party Advisory Added Reference Type Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2345043 Types: Issue Tracking Added Reference Type CVE: https://bugzilla.suse.com/show_bug.cgi?id=1237041 Types: Third Party Advisory Added Reference Type CVE: https://security.netapp.com/advisory/ntap-20250228-0002/ Types: Third Party Advisory Added Reference Type CVE: https://security-tracker.debian.org/tracker/CVE-2025-26466 Types: Third Party Advisory Added Reference Type CVE: https://ubuntu.com/security/CVE-2025-26466 Types: Third Party Advisory 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 CISA-ADP: https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt Types: Third Party Advisory Added Reference Type Red Hat, Inc.: https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt Types: Third Party Advisory -
CVE Modified by af854a3a-2127-422b-91ae-364da2661108
Mar. 05, 2025
Action Type Old Value New Value Added Reference https://bugzilla.suse.com/show_bug.cgi?id=1237041 Added Reference https://security-tracker.debian.org/tracker/CVE-2025-26466 Added Reference https://ubuntu.com/security/CVE-2025-26466 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 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Mar. 04, 2025
Action Type Old Value New Value Added Reference https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt -
New CVE Received by [email protected]
Feb. 28, 2025
Action Type Old Value New Value Added Description A flaw was found in the OpenSSH package. For each ping packet the SSH server receives, a pong packet is allocated in a memory buffer and stored in a queue of packages. It is only freed when the server/client key exchange has finished. A malicious client may keep sending such packages, leading to an uncontrolled increase in memory consumption on the server side. Consequently, the server may become unavailable, resulting in a denial of service attack. Added CVSS V3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added Reference https://access.redhat.com/security/cve/CVE-2025-26466 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2345043 Added Reference https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt -
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-20250228-0002/
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-26466 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-2025-26466
weaknesses.