CVE-2025-26466
MEDIUMOpenSSH - Denial of Service via Ping Packet Memory Exhaustion
Title source: llmExploitation Summary
EIP tracks 5 public exploits for CVE-2025-26466. PoCs published by rxerium, dolutech, acidboonrs.
AI-analyzed exploit summary This repository provides a Nuclei template for detecting vulnerable OpenSSH versions (9.5p1 to 9.9p1) affected by CVE-2025-26466. It is a passive scanner that matches SSH banner strings to identify potentially vulnerable hosts.
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.
Exploits (5)
This repository provides a Nuclei template for detecting vulnerable OpenSSH versions (9.5p1 to 9.9p1) affected by CVE-2025-26466. It is a passive scanner that matches SSH banner strings to identify potentially vulnerable hosts.
This repository provides a mitigation script for OpenSSH vulnerabilities CVE-2025-26465 and CVE-2025-26466, focusing on disabling VerifyHostKeyDNS and adjusting MaxStartups to prevent DoS attacks. It includes a detailed README and a bash script for automated mitigation.
This PoC exploits CVE-2025-26466, a pre-authentication Denial-of-Service vulnerability in OpenSSH versions before 9.9p2. The exploit floods the target SSH server with SSH2_MSG_PING packets during the initial handshake, causing memory leaks and CPU overload, leading to a DoS condition.
This repository contains a functional proof-of-concept exploit for CVE-2025-26466, which targets an OpenSSH vulnerability. The exploit initiates a TCP connection, sends crafted SSH packets, and loops sending ping requests without completing key exchange, leading to a denial-of-service condition due to unbounded pong responses.
This is a Metasploit module for CVE-2025-26466, which exploits a DoS vulnerability in OpenSSH (versions 9.5p1 to 9.9p1) by sending repeated SSH2_MSG_PING packets to exhaust server resources. The module includes options to control the number of packets and check for server responses.
References (15)
Scores
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H