CVE-2020-21836: gnu libredwg Out-of-bounds Write
CVSS: 8.8v3.1HighModified
Published 17-05-2021Last modified 09-07-2026
Vulnerability summary
CVE-2020-21836 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in gnu libredwg. EPSS estimates a 1.07% chance of exploitation in the next 30 days, higher than 64.3% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
8.8/10
010
High · v3.1 (NVD)EPSS score
1.07%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 17-05-2021PublishedVulnerability first disclosed.
- 09-07-2026Last modifiedVulnerability information updated.
Description
A heap based buffer overflow vulnerability exists in GNU LibreDWG 0.10 via read_2004_section_preview ../../src/decode.c:3175.
CVSS metrics
2 scores · 1 source · 2 versionsHigh 8.8Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesSingle source
Medium 6.8Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
1.07%
Chance of exploitation in the next 30 days
Percentile
64%
Versus all other CVEs
30-day change
0.00 pp
From 1.07% on 19-09-2026
19-09-202619-10-2026
EPSS score1.07%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundLibredwg
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Gnu1 product
- libredwg0.10
1 vendor · 1 product