CVE-2025-26466
Openssh: denial-of-service in openssh
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.
No summary for this CVE yet.
CVSS Vector Breakdown
Exploitability
AV:NAttack VectorNetwork
AC:HAttack ComplexityHigh
PR:NPrivileges RequiredNone
UI:NUser InteractionNone
Scope
S:UScopeUnchanged
Impact
C:NConfidentialityNone
I:NIntegrityNone
A:HAvailabilityHigh
Weaknesses
Affected Products
Novell Inc.
commercial·US
Red Hat
commercial·US
Canonical Ltd.
commercial·GBaka canonical
ООО «РусБИТех-Астра»
commercial·RUaka rusbitech-astra
OpenBSD Project
oss-project·USaka openbsd
АО «НППКТ»
commercial·RU
and 9 more affected products View all →
Exploitability
Official Patch Available
Workaround Available
Attack Graph
Products CVE Techniques Tactics
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MITRE ATT&CK
1 technique Impact
References
https://www.suse.com/security/cve/CVE-2025-26466.html
suse.com
https://ubuntu.com/security/CVE-2025-26466
ubuntu.com
https://www.qualys.com/2025/02/18/openssh-mitm-dos.txt
qualys.com
and 27 more references View all →
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