CVE-2023-52266Public exploitNetwork attack vector

Server crash via freed epoll context write

Published Dec 30, 2023 · Updated Sep 9, 2024

Use-after-free in ehttp 1.0.6 before 17405b9 allows remote attackers to crash an HTTP server via rapid connections. In read_func, a worker writes CONTEXT_READ_OVER through an EpollContext pointer after a concurrent writable-event path frees the object. No authentication is required; sustained rapid connections reproduce a server crash after roughly 30–60 seconds.

CVSS severity7.5
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in ehttp 1.0.6 before 17405b9 allows remote attackers to crash an HTTP server via rapid connections. In read_func, a worker writes CONTEXT_READ_OVER through an EpollContext pointer after a concurrent writable-event path frees the object. No authentication is required; sustained rapid connections reproduce a server crash after roughly 30–60 seconds.

The record

CVE
CVE-2023-52266
Published
Dec 30, 2023
Updated
Sep 9, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 30, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 9, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NVDCVSS: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-416Use After Free
T1499.004Application 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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