CVE-2021-39530

Name: CVE-2021-39530
Creator: NVD / NIST
Published: 2021-09-20T16:15:12.163+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 1.04%

Last modified Jun 17, 2026

CVE-2021-39530 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. An issue was discovered in libredwg through v0.10.1.3751. bit_wcs2nlen() in bits.c has a heap-based buffer overflow.. EPSS estimates a 1.04% chance of exploitation in the next 30 days.

Description

An issue was discovered in libredwg through v0.10.1.3751. bit_wcs2nlen() in bits.c has a heap-based buffer overflow.

Metrics

CVSS 3.1

8.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

1.04%

59.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Gnu	Libredwg	<= 0.10.1.3751

References

https://github.com/LibreDWG/libredwg/issues/258Exploit, Issue Tracking, Patch, Third Party Advisory
https://github.com/LibreDWG/libredwg/issues/258Exploit, Issue Tracking, Patch, Third Party Advisory

Timeline

Published: Sep 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-39530?

An issue was discovered in libredwg through v0.10.1.3751. bit_wcs2nlen() in bits.c has a heap-based buffer overflow.

How severe is CVE-2021-39530?

CVE-2021-39530 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 1.04% probability of exploitation in the next 30 days.

How do I fix CVE-2021-39530?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-39530?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST