What is CVE-2021-41498?

CVE-2021-41498 is a high-severity vulnerability in Pyo Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-12-17.

How severe is CVE-2021-41498?

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

Is CVE-2021-41498 known to be exploited?

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

Buffer overflow in Pyo Project

CVE-2021-41498

Buffer overflow in ajaxsoundstudio.com Pyo &lt and 1.03 in the Server_jack_init function. which allows attackers to conduct Denial of Service attacks by arbitrary constructing a overlong server name.

Vulnerability class: Buffer Overflow

Published 2021-12-17 · 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: 0.012 (66.9th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 66.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.012 · change: +0.001

Affected products

Pyo Project — versions 1.03

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

Public proof-of-concept exploits

References

github.com/belangeo/pyo/issues/221 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-41498?: CVE-2021-41498 is a high-severity vulnerability in Pyo Project, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.5/10. Published 2021-12-17.
How severe is CVE-2021-41498?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2021-41498 known to be exploited?: 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.