CVE-2023-38632Public exploitNetwork attack vector

Remote server crash via out-of-bounds terminator write

Published Jul 21, 2023 · Updated Oct 24, 2024

Stack-based buffer overflow in async-sockets-cpp 0.3.1 and earlier allows remote attackers to crash TCP servers via oversized packets. Receive writes a null terminator at tempBuffer[messageLength] after recv fills the entire BUFFER_SIZE-byte array, causing a one-byte out-of-bounds write. Any reachable TCP server built with the library is exposed; the published proof demonstrates an AddressSanitizer-detected abort rather than code execution.

CVSS severity9.8
Critical
EPSS probability1.88%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in async-sockets-cpp 0.3.1 and earlier allows remote attackers to crash TCP servers via oversized packets. Receive writes a null terminator at tempBuffer[messageLength] after recv fills the entire BUFFER_SIZE-byte array, causing a one-byte out-of-bounds write. Any reachable TCP server built with the library is exposed; the published proof demonstrates an AddressSanitizer-detected abort rather than code execution.

The record

CVE
CVE-2023-38632
Published
Jul 21, 2023
Updated
Oct 24, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 24, 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

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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-787Out-of-bounds Write
T1499.004Application or System Exploitation Stop

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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