CVE-2021-39521: gnu libredwg NULL Pointer Dereference
CVSS: 6.5v3.1MediumModified
Published 20-09-2021Last modified 04-08-2024
Vulnerability summary
CVE-2021-39521 is a medium (CVSS 6.5) NULL Pointer Dereference vulnerability in gnu libredwg. EPSS estimates a 0.87% chance of exploitation in the next 30 days, higher than 58% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
0.87%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Timeline
- 20-09-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in libredwg through v0.10.1.3751. A NULL pointer dereference exists in the function bit_read_BB() located in bits.c. It allows an attacker to cause Denial of Service.
CVSS metrics
2 scores · 1 source · 2 versionsMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HSourcesSingle source
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
0.87%
Chance of exploitation in the next 30 days
Percentile
58%
Versus all other CVEs
30-day change
0.00 pp
From 0.87% on 19-09-2026
19-09-202619-10-2026
EPSS score0.87%
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
- libredwg≤ 0.10.1.3751
1 vendor · 1 product
References
1 links- github.com/LibreDWG/libredwg/issues/262X Refsource MISCExploitIssue TrackingPatchThird Party Advisory