CVE-2021-33023 json
Advantech WebAccess
published 2021-10-18 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-19744
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.3%
- EPSS 2.3% chance of exploitation in 30 days, percentile 83%
- public exploits
- 0
- none known
Summary
Advantech WebAccess versions 9.02 and prior are vulnerable to a heap-based buffer overflow, which may allow an attacker to remotely execute code.
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
cisa ICSA-21-285-02 updated cvss 9.8
Advantech WebAccess
-
Advantech WebAccess <= 9.02affected: vendor fix, mitigation “Advantech has released Version 9.1.1 to address the stack-based buffer overflow vulnerability.” advantech.com
From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf
Exploit prediction
2.35% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
Affected products
- Advantech WebAccess
Classification
References
-
us-cert.cisa.gov
/ics/advisories/icsa-21-285-02
mitigation, third-party-advisory, us-government-resource
Sources
- CVE List CVE-2021-33023
- NVD CVE-2021-33023
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