HOMEVULNERABILITIESCVE-2021-43391
HIGH

CVE-2021-43391

CWE-125Published: November 14, 2021· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2021-43391 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected Vendors & Products

opendesign1 product(s)
drawings software development kit
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://www.opendesign.com/security-advisories
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-21-1352/
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-21-1361/
ADVISORYhttps://www.opendesign.com/security-advisories
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-21-1352/
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-21-1361/

All References (8)

→
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

Quick Facts

CVE IDCVE-2021-43391
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-125
CISA KEVNo
Affected1 vendor(s)
PublishedNov 14, 2021

Related CVEs (CWE-125)

CVE-2009-2523
10.0
CVE-2021-41556
10.0
CVE-2013-0767
10.0
CVE-2017-14451
10.0
CVE-2021-21777
10.0
CVE-2026-34987
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-43391 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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