CVE-2021-27799
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 2.37% probability · 84th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- zint/barcode generator
- Source
- cve@mitre.org
EPSS 2.4% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.