CVE-2024-32650Public exploitNetwork attack vector

Denial of service via premature close_notify handling

Published Apr 19, 2024 · Updated Aug 2, 2024

Infinite-loop denial of service in affected Rustls releases allows remote attackers to halt blocking server threads with crafted TLS messages. CommonState treats an unauthenticated close_notify received during ClientHello processing as EOF while the connection remains handshaking, leaving complete_io with neither read nor write work and no reachable exit. Only blocking complete_io callers, including Stream and StreamOwned, are exposed; affected threads spin at full CPU after disconnection, and several requests can stop a multithreaded server from handling normal traffic.

CVSS severity7.5
High
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Infinite-loop denial of service in affected Rustls releases allows remote attackers to halt blocking server threads with crafted TLS messages. CommonState treats an unauthenticated close_notify received during ClientHello processing as EOF while the connection remains handshaking, leaving complete_io with neither read nor write work and no reachable exit. Only blocking complete_io callers, including Stream and StreamOwned, are exposed; affected threads spin at full CPU after disconnection, and several requests can stop a multithreaded server from handling normal traffic.

The record

CVE
CVE-2024-32650
Published
Apr 19, 2024
Updated
Aug 2, 2024
Vendor
Rustls
Product
Rustls
Classifications
CWE-835, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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== 0.20.0
  2. Affected versionversion=>= 0.21.0, < 0.21.11
  3. Affected versionversion=>= 0.22.0, < 0.22.4
  4. Affected versionversion=>= 0.23.0, < 0.23.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rustls · Rustlsversion== 0.20.0; version=>= 0.21.0, < 0.21.11; version=>= 0.22.0, < 0.22.4; version=>= 0.23.0, < 0.23.5

Published CVSS scores

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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