CVE-2021-30027
MEDIUMCVSS 5.5/10EPSS 0.70%
Last modified
CVE-2021-30027 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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.. EPSS estimates a 0.70% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Md4c Project | Md4c | 0.4.7 |
References
- https://github.com/mity/md4c/commit/4fc808d8fe8d8904f8525bb4231d854f45e23a19Patch, Third Party Advisory
- https://github.com/mity/md4c/issues/155Exploit, Issue Tracking, Third Party Advisory
- https://github.com/mity/md4c/commit/4fc808d8fe8d8904f8525bb4231d854f45e23a19Patch, Third Party Advisory
- https://github.com/mity/md4c/issues/155Exploit, Issue Tracking, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-30027?
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.
How severe is CVE-2021-30027?
CVE-2021-30027 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.70% probability of exploitation in the next 30 days.
How do I fix CVE-2021-30027?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2021-30027?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST