Vulnerabilities > CVE-2025-26466
Attack vector
NETWORK Attack complexity
HIGH Privileges required
NONE Confidentiality impact
NONE Integrity impact
NONE Availability impact
HIGH Summary
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.
Vulnerable Configurations
| Part | Description | Count |
|---|---|---|
| Application | 9 | |
| OS | 2 | |
| OS | 3 |
References
- https://access.redhat.com/security/cve/CVE-2025-26466
- https://bugzilla.redhat.com/show_bug.cgi?id=2345043
- https://bugzilla.suse.com/show_bug.cgi?id=1237041
- https://seclists.org/oss-sec/2025/q1/144
- https://security.netapp.com/advisory/ntap-20250228-0002/
- https://security-tracker.debian.org/tracker/CVE-2025-26466
- https://ubuntu.com/security/CVE-2025-26466
- https://www.openwall.com/lists/oss-security/2025/02/18/1
- https://www.openwall.com/lists/oss-security/2025/02/18/4
- https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt
- https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt