CVE-2020-25821

HIGHNVD 7.57.5—

7.5

peg-markdown 0.4.14 has a NULL pointer dereference in process_raw_blocks in markdown_lib.c. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

CVSS v3: 7.5
EG Score: 7.5(medium)
EPSS: 63.2%
KEV: Not listed

Published

September 23, 2020

Last Modified

November 21, 2024

References (2)

cve@mitrehttps://github.com/jgm/peg-markdown/issues/43
af854a3a-2127-422b-91ae-364da2661108https://github.com/jgm/peg-markdown/issues/43

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-476NULL Pointer Dereference

Data Freshness Timeline

(refreshed 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:10 UTCepss_batch
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2026-06-02 20:11 UTCepss_batch
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2026-05-29 13:42 UTCepss_batch
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2026-05-27 13:39 UTCepss_batch
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2026-05-26 07:17 UTCepss_batch
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2026-05-24 16:48 UTCepss_batch
2026-05-23 07:25 UTCEG score recompute

Frequently asked(5)

What is CVE-2020-25821?

CVE-2020-25821 is a high vulnerability published on September 23, 2020. peg-markdown 0.4.14 has a NULL pointer dereference in processrawblocks in markdown_lib.c. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

When was CVE-2020-25821 disclosed?

CVE-2020-25821 was first published in the National Vulnerability Database on September 23, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2020-25821 actively exploited?

CVE-2020-25821 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 63.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2020-25821?

CVE-2020-25821 has a CVSS v3 base score of 7.5 (NVD).

How do I remediate CVE-2020-25821?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2020-25821, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2020-25821

📅 Published

🔄 Last Modified

🔗 References (2)

Weakness Classification(1)

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2020-25821?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (2)

Frequently asked(5)

Related CVEs(same CWE)