What’s Vulnerable › Vulnerabilities

CVE-2018-21232

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-04-29 · updated 2026-06-17
• Weakness: CWE-674

Description

re2c before 2.0 has uncontrolled recursion that causes stack consumption in find_fixed_tags.

Affected products

• Re2C: before 2.0 — fixed in 2.0

How to fix

Upgrade to a fixed version: Re2C 2.0. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2020/05/14/4
• https://github.com/skvadrik/re2c/issues/219
• https://www.openwall.com/lists/oss-security/2020/04/27/2
• http://www.openwall.com/lists/oss-security/2020/05/14/4
• https://github.com/skvadrik/re2c/issues/219
• https://www.openwall.com/lists/oss-security/2020/04/27/2

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