CVE-2024-49769Network attack vector

Denial of service via socket cleanup race

Published Oct 29, 2024 · Updated Nov 17, 2024

Denial of service in Pylons Project Waitress before 3.0.1 allows remote attackers to exhaust sockets and CPU via rapid disconnects. During HTTPChannel construction, wasyncore treats a socket closed before getpeername() as disconnected but leaves its dispatcher registered for writes. An unauthenticated network client needs only to connect and close at the race point; repeated triggers can pin the main thread and consume the socket pool.

CVSS severity7.5
High
EPSS probability1.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Pylons Project Waitress before 3.0.1 allows remote attackers to exhaust sockets and CPU via rapid disconnects. During HTTPChannel construction, wasyncore treats a socket closed before getpeername() as disconnected but leaves its dispatcher registered for writes. An unauthenticated network client needs only to connect and close at the race point; repeated triggers can pin the main thread and consume the socket pool.

The record

CVE
CVE-2024-49769
Published
Oct 29, 2024
Updated
Nov 17, 2024
Vendor
Pylons Project
Product
Waitress
Classifications
CWE-772, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <3.0.1
  2. Affected versionversion=< 3.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pylons Project · Waitressversion=0 <3.0.1; version=< 3.0.1

Published CVSS scores

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5GitHub, Inc.CVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo