CVE-2021-27799

Name: CVE-2021-27799
Creator: NVD / NIST
Published: 2021-02-26T22:15:20.847+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.37%

Last modified Jun 17, 2026

CVE-2021-27799 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.37% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.37%

81.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Zint	Barcode Generator	2.9.1

References

http://zint.org.uk/Manual.aspx?type=p&page=3Vendor Advisory
http://zint.org.uk/Manual.aspx?type=p&page=4Vendor Advisory
http://zint.org.uk/Manual.aspx?type=p&page=5Vendor Advisory
https://sourceforge.net/p/zint/code/ci/7f8c8114f31c09a986597e0ba63a49f96150368a/Patch, Third Party Advisory
https://sourceforge.net/p/zint/tickets/218/Exploit, Third Party Advisory
http://zint.org.uk/Manual.aspx?type=p&page=3Vendor Advisory
http://zint.org.uk/Manual.aspx?type=p&page=4Vendor Advisory
http://zint.org.uk/Manual.aspx?type=p&page=5Vendor Advisory
https://sourceforge.net/p/zint/code/ci/7f8c8114f31c09a986597e0ba63a49f96150368a/Patch, Third Party Advisory
https://sourceforge.net/p/zint/tickets/218/Exploit, Third Party Advisory

Timeline

Published: Feb 26, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27799?

How severe is CVE-2021-27799?

CVE-2021-27799 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.37% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27799?

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-2021-27799?

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

Scan your code now

Source: NVD / NIST