No exploitation reportedFix available

CVE-2021-33000

No exploitation reported by the sources we read.

Published2021-06-24
WeaknessCWE-122 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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).

Timeline

dates in UTC

2021-06-2418:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-33000?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-33000?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Advantech webaccess\/hmi designer

Branch	Affected	Fixed in	Source
2.1	≤ 2.1.9.95	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-173-01 CISA1 known affected
Advantech WebAccess HMI Designer (Update A)
WebAccess HMI Designer: Versions prior to 2.1.11.0

Full record on NVD

Fix

Vendor fix CISA ICSA-21-173-01 · 1 productAdvantech recommends users update to the latest version of WebAccess HMI Designer v2.1.11.0
Mitigation from the vendor CISA ICSA-21-173-01 · 1 productSpecific questions should be directed to Advantech customer service.

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.8read 2026-10-23
NVDCVSS 2.06.8read 2026-10-23
CNAweakness (CWE)CWE-122read 2026-10-23
NVDweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score1.0 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published: 2021-06-24
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-33000?

Is CVE-2021-33000 actively exploited?

Active exploitation of CVE-2021-33000 has not been confirmed. Its EPSS score was 1.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-33000?

CVE-2021-33000 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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