Is CVE-2021-30027 in the CISA KEV catalog?

No. CVE-2021-30027 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-30027?

CVE-2021-30027 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2021-30027?

CVE-2021-30027 has an EPSS score of 0.70% (49th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-30027?

Upgrade md4c on debian 11 to 0.4.7-2 or later.

CVE & CISA-KEV Catalog

CVE-2021-30027

MEDIUM

5.5

CVSS v3

NVD

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.

CWE-908

How to fix

Remediation Available

md4cDebian

Fixed in:0.4.7-2CVE-2021-30027

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Exploit Intelligence

0.70%probability of exploitation in 30 days

49thpercentile

Moderate risk: more likely to be exploited than 49% of all known CVEs.

References

Patch1

github.com

Exploit1

github.com

Related Vulnerabilities

Other CWE-908 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-5777	High	7.5	100%	KEV + Ransom	Fix
CVE-2023-24941	Critical	9.8	95%	-	Fix
CVE-2007-1751	High	9.3	61%	-	-
CVE-2008-0081	Critical	9.8	58%	-	-
CVE-2020-1934	Medium	5.3	52%	-	Fix
CVE-2011-1255	High	9.3	42%	-	-

Embed a live status badge for CVE-2021-30027

Markdown

[![CVE-2021-30027](https://tridentstack.com/cve/badge/CVE-2021-30027.svg)](https://tridentstack.com/cve/CVE-2021-30027)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-30027"><img src="https://tridentstack.com/cve/badge/CVE-2021-30027.svg" alt="CVE-2021-30027"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.