What is CVE-2021-28237?

CVE-2021-28237 is a critical-severity vulnerability in GNU Libredwg, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-12-02.

How severe is CVE-2021-28237?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-28237 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Buffer overflow in GNU Libredwg

CVE-2021-28237

LibreDWG v0.12.3 was discovered to contain a heap-buffer overflow via decode_preR13.

Vulnerability class: Buffer Overflow

Published 2021-12-02 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (72.6th percentile), scored 2026-10-30.

Low probability of exploitation in the next 30 days, but still tracked. 73rd percentile — 72.6% 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

GNU Libredwg — versions 0.12.3

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

Public proof-of-concept exploits

zodf0055980/Yuan-fuzz

References

github.com/LibreDWG/libredwg/issues/325 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-28237?: CVE-2021-28237 is a critical-severity vulnerability in GNU Libredwg, classified under Out-of-bounds Write. CVSS score: 9.8/10. Published 2021-12-02.
How severe is CVE-2021-28237?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-28237 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.