CVE-2025-26466: Openssh: denial-of-service in openssh
Siemens · OpenSSH
Vendor fix available · Affected: Siemens OpenSSH · Exploitation: likely to be exploited (10% or more)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 98% of scored CVEs
DescriptionCVE.org
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 products9
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- OpenSSHfrom 9.5p1 up to and including 9.9p1
- Red Hat · Red Hat Enterprise Linux 10Versions not stated
- Red Hat · Red Hat Enterprise Linux 9Versions not stated
- Red Hat · Red Hat Enterprise Linux 9Versions not stated
- Red Hat · Red Hat Enterprise Linux 6Versions not stated
- Red Hat · Red Hat Enterprise Linux 7Versions not stated
- Red Hat · Red Hat Enterprise Linux 8Versions not stated
- Red Hat · Red Hat OpenShift Container Platform 4Versions not stated
- Red Hat · Red Hat OpenShift Container Platform 4Versions not stated
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Likely to be exploited (10% or more). EPSS gives it a 10% or higher chance of exploitation in the next 30 days.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- Siemens
- Published
- February 2025
CoverageNo articles yet
No CyberSIXT article names CVE-2025-26466 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.
References
- NVD entrynvd.nist.gov
- CVE recordcve.org
- Weakness CWE-770cwe.mitre.org
- Vendor advisoryaccess.redhat.com
- Vendor advisoryaccess.redhat.com
- access.redhat.com/security/cve/CVE-2025-26466access.redhat.com
- Issue trackerbugzilla.redhat.com
- seclists.org/oss-sec/2025/q1/144seclists.org
- qualys.com/2025/02/18/openssh-mitm-dos.txtqualys.com
- security.netapp.com/advisory/ntap-20250228-0002security.netapp.com
- openwall.com/lists/oss-security/2025/02/18/1openwall.com
- openwall.com/lists/oss-security/2025/02/18/4openwall.com
- bugzilla.suse.com/show_bug.cgi?id=1237041bugzilla.suse.com
- security-tracker.debian.org/tracker/CVE-2025-26466security-tracker.debian.org
- ubuntu.com/security/CVE-2025-26466ubuntu.com
6 more references are in the CVE record.