What’s Vulnerable › Vulnerabilities

CVE-2021-39247

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-08-17 · updated 2026-06-17
• Weakness: CWE-125

Description

Zint Barcode Generator before 2.10.0 has a one-byte buffer over-read, related to is_last_single_ascii in code1.c, and rs_encode_uint in reedsol.c.

Affected products

• Zint Barcode Generator: before 2.10.0 — fixed in 2.10.0

How to fix

Upgrade to a fixed version: Zint Barcode Generator 2.10.0. Check the vendor advisory for mitigations.

References

• https://sourceforge.net/p/zint/code/ci/9b02cd52214e80f945bff41fc94bc1e17e15810c/
• https://sourceforge.net/p/zint/tickets/232/
• https://sourceforge.net/p/zint/code/ci/9b02cd52214e80f945bff41fc94bc1e17e15810c/
• https://sourceforge.net/p/zint/tickets/232/

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