What’s Vulnerable › Vulnerabilities

CVE-2021-30027

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-04-29 · updated 2026-06-17
• Weakness: CWE-908

Description

md_analyze_line in md4c.c in md4c 0.4.7 allows attackers to trigger use of uninitialized memory, and cause a denial of service via a malformed Markdown document.

Affected products

• Md4C Project Md4C: 0.4.7

References

• https://github.com/mity/md4c/commit/4fc808d8fe8d8904f8525bb4231d854f45e23a19
• https://github.com/mity/md4c/issues/155
• https://github.com/mity/md4c/commit/4fc808d8fe8d8904f8525bb4231d854f45e23a19
• https://github.com/mity/md4c/issues/155

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