CVE-2021-27799

7.5 highEPSS 2.4%

High (7.5) in zint barcode generator. EPSS 2.4% chance of exploitation in the next 30 days.

ean_leading_zeroes in backend/upcean.c in Zint Barcode Generator 2.9.1 has a stack-based buffer overflow that is reachable from the C API through an application that includes the Zint Barcode Generator library code.

Severity

CVSS 3.1

7.5 high

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

EPSS: 2.4% chance of exploitation in the next 30 days; higher than 83% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2021-02-26
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

zint:barcode_generator

References

http://zint.org.uk/Manual.aspx?type=p&page=3
http://zint.org.uk/Manual.aspx?type=p&page=4
http://zint.org.uk/Manual.aspx?type=p&page=5
https://sourceforge.net/p/zint/code/ci/7f8c8114f31c09a986597e0ba63a49f96150368a/
https://sourceforge.net/p/zint/tickets/218/

Check your stack JSON