CVE-2024-43410Public exploitNetwork attack vector

Unauthenticated service crash via unchecked packet length

Published Aug 21, 2024 · Updated Aug 21, 2024

Resource exhaustion in Russh Project russh before 0.44.1 allows remote attackers to crash an SSH server via an oversized packet length. In russh/src/cipher/mod.rs, the packet reader decrypts the four-byte length and resizes its buffer to the client-supplied value without enforcing a maximum. The allocation occurs before authentication, and several connections carrying a near-4 GiB declared length can exhaust process memory and interrupt the service.

CVSS severity7.5
High
EPSS probability0.91%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Russh Project russh before 0.44.1 allows remote attackers to crash an SSH server via an oversized packet length. In russh/src/cipher/mod.rs, the packet reader decrypts the four-byte length and resizes its buffer to the client-supplied value without enforcing a maximum. The allocation occurs before authentication, and several connections carrying a near-4 GiB declared length can exhaust process memory and interrupt the service.

The record

CVE
CVE-2024-43410
Published
Aug 21, 2024
Updated
Aug 21, 2024
Vendor
Russh Project
Product
russh
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <0.44.1
  2. Affected versionversion=< 0.44.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Russh Project · russhversion=0 <0.44.1; version=< 0.44.1

Published CVSS scores

8.7OSVCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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