What’s Vulnerable › Vulnerabilities

CVE-2021-27799

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-26 · updated 2026-06-17
• Weakness: CWE-787

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.

Affected products

• Zint Barcode Generator: 2.9.1

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/
• 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/

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