CVE-2025-26466

medium Fortinet
CVSS v3 Base Score
5.9
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS Score
42.5%
Exploitation probability in 30 days
Top 3% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
High
Published: February 28, 2025 (439 days ago)
Last Modified: February 10, 2026
Vendor: Fortinet
Source: NVD

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.

CWE

CWE-770

Affected Products

openbsd opensshcanonical ubuntu linuxdebian debian linux

References

🔗 access.redhat.com 🔗 bugzilla.redhat.com 🔗 seclists.org 🔗 www.qualys.com 🔗 seclists.org