CVE-2021-43391

Name: CVE-2021-43391
Creator: NVD / NIST
Published: 2021-11-14T21:15:08.353+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 1.63%

Last modified Jun 17, 2026

CVE-2021-43391 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. An Out-of-Bounds Read vulnerability exists when reading a DXF file using Open Design Alliance Drawings SDK before 2022.11. The specific issue exists within the parsing of DXF files. EPSS estimates a 1.63% chance of exploitation in the next 30 days.

Description

An Out-of-Bounds Read vulnerability exists when reading a DXF file using Open Design Alliance Drawings SDK before 2022.11. The specific issue exists within the parsing of DXF files. Crafted data in a DXF file (an invalid dash counter in line types) can trigger a read past the end of an allocated buffer. An attacker can leverage this vulnerability to execute code in the context of the current process.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

1.63%

73.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-125

Affected Software

Vendor	Product	Versions
Opendesign	Drawings Software Development Kit	< 2022.11

References

https://cert-portal.siemens.com/productcert/pdf/ssa-491245.pdf
https://www.opendesign.com/security-advisoriesVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1352/Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1361/Third Party Advisory, VDB Entry
https://cert-portal.siemens.com/productcert/pdf/ssa-491245.pdf
https://www.opendesign.com/security-advisoriesVendor Advisory
https://www.zerodayinitiative.com/advisories/ZDI-21-1352/Third Party Advisory, VDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-21-1361/Third Party Advisory, VDB Entry

Timeline

Published: Nov 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-43391?

How severe is CVE-2021-43391?

CVE-2021-43391 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 1.63% probability of exploitation in the next 30 days.

How do I fix CVE-2021-43391?

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-2021-43391?

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

Scan your code now

Source: NVD / NIST