Russh
CVE-2024-43410
HIGH
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V2 - Validation and Business Logic Resource allocation limits
MITRE ATT&CK
1 technique across 1 tactic: Impact The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
| Impact | CVSS score of 7.5 (HIGH). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. Public proof-of-concept exploit code is available. |
| Exploit ScenarioDerived | A remote attacker could exhaust system resources through uncontrolled allocation by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability. |
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Alert meAnalysisAI
Russh is a Rust SSH client & server library. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.
RemediationAI
A vendor patch is available. Apply the latest security update as soon as possible. Set resource limits, implement rate limiting, validate input sizes.
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in cargo
Checking this CVE against your own stacks and servers is part of the Basic plan and up.
Technical ContextAI · show details
This vulnerability is classified as Allocation of Resources Without Limits (CWE-770), which allows attackers to exhaust system resources through uncontrolled allocation. Russh is a Rust SSH client & server library. Allocating an untrusted amount of memory allows any unauthenticated user to OOM a russh server. An SSH packet consists of a 4-byte big-endian length, followed by a byte stream of this length. After parsing and potentially decrypting the 4-byte length, russh allocates enough memory for this bytestream, as a performance optimization to avoid reallocations later. But this length is entirely untrusted and can be set to any value by the client, causing this much memory to be allocated, which will cause the process to OOM within a few such requests. This vulnerability is fixed in 0.44.1. Affected products include: Russh Project Russh, Warpgate Project Warpgate.
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Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from Vendor (github) · only source for this CVE.
CVSS VectorVendor: github
DescriptionCVE.org
Russh is a Rust SSH client & server library. Allocating an untrusted amount of memory allows any unauthenticated user to OOM a russh server. An SSH packet consists of a 4-byte big-endian length, followed by a byte stream of this length. After parsing and potentially decrypting the 4-byte length, russh allocates enough memory for this bytestream, as a performance optimization to avoid reallocations later. But this length is entirely untrusted and can be set to any value by the client, causing this much memory to be allocated, which will cause the process to OOM within a few such requests. This vulnerability is fixed in 0.44.1.
Threat Intelligence Overview
NVD
CVE.org
EPSS
GitHub
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.
Affected Products (CPE)CVE.org
The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6 and other products, allows remot
russh is a Rust SSH client and server library. Rated medium severity (CVSS 5.9), this vulnerability is remotely exploita
Unauthenticated remote denial of service in the Russh SSH library (versions ≤ 0.62.3) allows any network attacker to cra
Denial-of-service in russh's Curve25519 key exchange client path allows any malicious SSH server to crash a connecting r
Improper validation in the Russh Rust SSH library (versions prior to 0.63.1) lets a malicious or compromised SSH server
Pre-authentication denial-of-service in russh SSH server library allows remote attackers to crash servers implementing k
Denial of service in Russh (Rust SSH client/server library) versions 0.34.0 through 0.60.x allows remote SSH peers to tr
Denial of service in Russh (versions 0.37.0-0.60.x), a Rust SSH client and server library, allows a malicious SSH server
Memory exhaustion in the Russh Rust SSH client/server library prior to 0.63.2 allows an authenticated remote peer to sta
The Windows Pageant client inside the pageant Rust crate (pageant/src/wmmessage.rs) trusts a peer-controlled u32 respons
Resource exhaustion in Russh's SSH server identification-string reader allows unauthenticated remote attackers to hold c
Memory and task exhaustion in the russh SSH agent server (versions through 0.64.0) lets an unauthenticated attacker deny
Exploit-DB