CVE-2020-6621

Name: CVE-2020-6621
Creator: NVD / NIST
Published: 2020-01-08T23:15:10.677+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.14%

Last modified Jun 17, 2026

CVE-2020-6621 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.. EPSS estimates a 1.14% chance of exploitation in the next 30 days.

Description

stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

1.14%

62.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Nothings	Stb Truetype.H	<= 1.22

References

https://github.com/nothings/stb/issues/867Exploit, Third Party Advisory
https://github.com/nothings/stb/issues/867Exploit, Third Party Advisory

Timeline

Published: Jan 8, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-6621?

stb stb_truetype.h through 1.22 has a heap-based buffer over-read in ttUSHORT.

How severe is CVE-2020-6621?

CVE-2020-6621 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.14% probability of exploitation in the next 30 days.

How do I fix CVE-2020-6621?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-6621?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST