HOMEVULNERABILITIESCVE-2021-33000
HIGH

CVE-2021-33000

CWE-122Published: June 24, 2021· Updated: Jun 17, 2026

7.8
CVSS v3.1

Official Description

Parsing a maliciously crafted project file may cause a heap-based buffer overflow, which may allow an attacker to perform arbitrary code execution. User interaction is required on the WebAccess HMI Designer (versions 2.1.9.95 and prior).

NVD Source

Technical Analysis

CVE-2021-33000 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

advantech1 product(s)
webaccess\/hmi designer
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-21-173-01
ADVISORYhttps://us-cert.cisa.gov/ics/advisories/icsa-21-173-01

All References (2)

→
https://us-cert.cisa.gov/ics/advisories/icsa-21-173-01Third Party Advisory · US Government Resource
→
https://us-cert.cisa.gov/ics/advisories/icsa-21-173-01Third Party Advisory · US Government Resource

Quick Facts

CVE IDCVE-2021-33000
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-122
CISA KEVNo
Affected1 vendor(s)
PublishedJun 24, 2021

Related CVEs (CWE-122)

CVE-2022-34819
10.0
CVE-2021-21940
10.0
CVE-2026-46752
10.0
CVE-2021-25387
10.0
CVE-2025-23123
10.0
CVE-2026-44050
9.9

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-33000 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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