What is CVE-2023-40296?

CVE-2023-40296 is a high-severity vulnerability in Eminfedar Async-Sockets-Cpp, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2023-08-14.

How severe is CVE-2023-40296?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2023-40296 known to be exploited?

5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in Eminfedar Async-Sockets-Cpp

CVE-2023-40296

async-sockets-cpp through 0.3.1 has a stack-based buffer overflow in ReceiveFrom and Receive in udpsocket.hpp when processing malformed UDP packets.

Vulnerability class: Buffer Overflow

Published 2023-08-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.009 (58.2th percentile), scored 2026-10-08.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Eminfedar Async-Sockets-Cpp

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

References

github.com/eminfedar/async-sockets-cpp/issues/32 (Exploit, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2023-40296?: CVE-2023-40296 is a high-severity vulnerability in Eminfedar Async-Sockets-Cpp, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2023-08-14.
How severe is CVE-2023-40296?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2023-40296 known to be exploited?: 5 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.