HOMEVULNERABILITIESCVE-2021-43554
HIGH

CVE-2021-43554

CWE-787Published: December 28, 2021· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

FATEK WinProladder Versions 3.30_24518 and prior are vulnerable to an out-of-bounds write while processing project files, which may allow an attacker to execute arbitrary code.

NVD Source

Technical Analysis

CVE-2021-43554 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.

From a weakness classification perspective (CWE-787): Out-of-bounds write vulnerabilities can lead to data corruption, crashes, or arbitrary code execution.

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

fatek1 product(s)
winproladder
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://us-cert.cisa.gov/ics/advisories/icsa-21-320-01
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-22-028/
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-22-030/
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-22-033/
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-320-01
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-22-028/
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-22-030/
ADVISORYhttps://www.zerodayinitiative.com/advisories/ZDI-22-033/

All References (8)

→
https://us-cert.cisa.gov/ics/advisories/icsa-21-320-01Third Party Advisory · US Government Resource
→
https://www.zerodayinitiative.com/advisories/ZDI-22-028/Third Party Advisory · VDB Entry
→
https://www.zerodayinitiative.com/advisories/ZDI-22-030/Third Party Advisory · VDB Entry
→
https://www.zerodayinitiative.com/advisories/ZDI-22-033/Third Party Advisory · VDB Entry
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-320-01Third Party Advisory · US Government Resource
→
https://www.zerodayinitiative.com/advisories/ZDI-22-028/Third Party Advisory · VDB Entry
→
https://www.zerodayinitiative.com/advisories/ZDI-22-030/Third Party Advisory · VDB Entry
→
https://www.zerodayinitiative.com/advisories/ZDI-22-033/Third Party Advisory · VDB Entry

Quick Facts

CVE IDCVE-2021-43554
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-787
CISA KEVNo
Affected1 vendor(s)
PublishedDec 28, 2021

Related CVEs (CWE-787)

CVE-2004-1287
10.0
CVE-2026-4746
10.0
CVE-2020-11897
10.0
CVE-2022-30292
10.0
CVE-2018-10718
10.0
CVE-2004-0978
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-43554 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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