Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Not supplied / Not supplied | affected 9.5p1 through 9.9p1 |
| Red Hat / Red Hat Enterprise Linux 10 | unaffected 0:9.9p1-7.el10_0 before * |
| Red Hat / Red Hat Enterprise Linux 9 | unaffected 0:8.7p1-45.el9 before * |
| Red Hat / Red Hat Enterprise Linux 9 | unaffected 0:8.7p1-45.el9 before * |
| Red Hat / Red Hat Enterprise Linux 6 | unaffected |
| Red Hat / Red Hat Enterprise Linux 7 | unaffected |
| Red Hat / Red Hat Enterprise Linux 8 | unaffected |
| Red Hat / Red Hat OpenShift Container Platform 4 | unaffected |
| Red Hat / Red Hat OpenShift Container Platform 4 | unaffected |
CWE
CWE-770
References
- https://access.redhat.com/errata/RHBA-2025:6305
- https://access.redhat.com/errata/RHSA-2025:6993
- https://access.redhat.com/security/cve/CVE-2025-26466
- https://bugzilla.redhat.com/show_bug.cgi?id=2345043
- https://seclists.org/oss-sec/2025/q1/144
- https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt
ADP enrichment
No English description supplied.
- https://security.netapp.com/advisory/ntap-20250228-0002/
- https://www.openwall.com/lists/oss-security/2025/02/18/1
- https://www.openwall.com/lists/oss-security/2025/02/18/4
- https://bugzilla.suse.com/show_bug.cgi?id=1237041
- https://security-tracker.debian.org/tracker/CVE-2025-26466
- https://ubuntu.com/security/CVE-2025-26466
- http://seclists.org/fulldisclosure/2025/May/8
- http://seclists.org/fulldisclosure/2025/May/7
- http://seclists.org/fulldisclosure/2025/Feb/18
- https://www.vicarius.io/vsociety/posts/cve-2025-26466-detection-script-memory-consumption-vulnerability-in-openssh
- https://www.vicarius.io/vsociety/posts/cve-2025-26466-mitigation-script-memory-consumption-vulnerability-in-openssh
No English description supplied.
No English description supplied.