What is CVE-2020-25821?

CVE-2020-25821 is a high-severity vulnerability in Peg-Markdown Project, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2020-09-23.

How severe is CVE-2020-25821?

High severity. CVSS v3 base score is 7.5 out of 10.

NULL pointer dereference in Peg-Markdown Project

CVE-2020-25821

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

Published 2020-09-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.6th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 72nd percentile — 71.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.014 · newest: 0.014 · change: 0.000

Affected products

Peg-Markdown Project — versions 0.4.14

Weakness classification (CWE)

CWE-476 — NULL Pointer Dereference

References

github.com/jgm/peg-markdown/issues/43 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2020-25821?: CVE-2020-25821 is a high-severity vulnerability in Peg-Markdown Project, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2020-09-23.
How severe is CVE-2020-25821?: High severity. CVSS v3 base score is 7.5 out of 10.