What is CVE-2021-47798?

CVE-2021-47798 is a critical-severity vulnerability in Noteburner, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-01-16.

How severe is CVE-2021-47798?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Buffer overflow in Noteburner

CVE-2021-47798

NoteBurner 2.35 contains a buffer overflow vulnerability in the license code input field that allows attackers to crash the application. Attackers can generate a 6000-byte payload and paste it into the 'Name' and 'Code' fields to trigger an application crash.

Vulnerability class: Buffer Overflow

Published 2026-01-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (34.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Noteburner — versions 2.35

Weakness classification (CWE)

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

References

www.exploit-db.com/exploits/50154 (exploit)
www.noteburner.com/ (product)
www.vulncheck.com/advisories/noteburner-denial-of-service-dos-poc (third-party-advisory)

Frequently asked questions

What is CVE-2021-47798?: CVE-2021-47798 is a critical-severity vulnerability in Noteburner, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 9.8/10. Published 2026-01-16.
How severe is CVE-2021-47798?: Critical severity. CVSS v3 base score is 9.8 out of 10.