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CVE-2025-5449— Libssh: integer overflow in libssh sftp server packet length validation leading to denial of service

Quick assessment

Affected
CVE-2025-5449
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libssh是libssh组织的一个用于访问SSH服务的C语言开发包，它能够执行远程命令、文件传输，同时为远程的程序提供安全的传输通道。 libssh存在输入验证错误漏洞，该漏洞源于SFTP服务器消息解码逻辑中的整数溢出，可能导致内存分配失败和服务器进程崩溃，造成拒绝服务。

CVSS 6.5 · Medium EPSS 0.88% · P58

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 8

VendorProduct Version RangeStatus
None None 0.11.0≤ 0.11.1 affected
Red Hat Red Hat Enterprise Linux 10 any unaffected
Red Hat Red Hat Enterprise Linux 6 any unaffected
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
Red Hat Red Hat Enterprise Linux 9 any unaffected
Red Hat Red Hat OpenShift Container Platform 4 any unaffected
any unaffected

I. Basic Information for CVE-2025-5449

Vulnerability Information
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Vulnerability Title
Libssh: integer overflow in libssh sftp server packet length validation leading to denial of service
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the SFTP server message decoding logic of libssh. The issue occurs due to an incorrect packet length check that allows an integer overflow when handling large payload sizes on 32-bit systems. This issue leads to failed memory allocation and causes the server process to crash, resulting in a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数溢出或超界折返
Source: CVE Program / CVE List V5
Vulnerability Title
libssh 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libssh是libssh组织的一个用于访问SSH服务的C语言开发包，它能够执行远程命令、文件传输，同时为远程的程序提供安全的传输通道。 libssh存在输入验证错误漏洞，该漏洞源于SFTP服务器消息解码逻辑中的整数溢出，可能导致内存分配失败和服务器进程崩溃，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0.11.0 ~ 0.11.1 -
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
Red Hat Red Hat Enterprise Linux 6 - cpe:/o:redhat:enterprise_linux:6
Red Hat Red Hat Enterprise Linux 7 - cpe:/o:redhat:enterprise_linux:7
Red Hat Red Hat Enterprise Linux 8 - cpe:/o:redhat:enterprise_linux:8
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2025-5449

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2025-5449

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Patches & Fixes for CVE-2025-5449 (1)

IV. Related Vulnerabilities

Same weakness: CWE-190

V. Comments for CVE-2025-5449

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