CVE search · CVE-2025-26466
CVE-2025-26466
medium 5.9
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.
Details
- Status
- Modified
- Published
- Last changed
- Source
- secalert@redhat.com
- Weakness
- CWE-770
Severity
| Version | Score | Vector | Source |
|---|---|---|---|
| CVSS 3.1 | medium 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
secalert@redhat.comSecondary |
| CVSS 3.1 | medium 5.9 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H |
nvd@nist.govPrimary |
Affected products
Vendor and product from the NVD’s CPE applicability statements. Versions and conditions are on the NVD’s page.
References
- https://access.redhat.com/errata/RHBA-2025:6305
- https://access.redhat.com/errata/RHSA-2025:6993
- https://access.redhat.com/security/cve/CVE-2025-26466Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2345043Issue Tracking
- https://seclists.org/oss-sec/2025/q1/144
- https://www.qualys.com/2025/02/18/openssh-mitm-dos.txtThird Party Advisory
- http://seclists.org/fulldisclosure/2025/Feb/18
- http://seclists.org/fulldisclosure/2025/May/7
- http://seclists.org/fulldisclosure/2025/May/8
- https://bugzilla.suse.com/show_bug.cgi?id=1237041Third Party Advisory
- https://security-tracker.debian.org/tracker/CVE-2025-26466Third Party Advisory
- https://security.netapp.com/advisory/ntap-20250228-0002/Third Party Advisory
- https://ubuntu.com/security/CVE-2025-26466Third Party Advisory
- https://www.openwall.com/lists/oss-security/2025/02/18/1Mailing ListThird Party Advisory
- https://www.openwall.com/lists/oss-security/2025/02/18/4Mailing ListThird Party Advisory
- 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
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://www.qualys.com/2025/02/18/openssh-mitm-dos.txtThird Party Advisory