What’s Vulnerable › Vulnerabilities

CVE-2021-33023: Advantech WebAccess

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-10-18 · updated 2026-06-17
• Weakness: CWE-122

Description

Advantech WebAccess versions 9.02 and prior are vulnerable to a heap-based buffer overflow, which may allow an attacker to remotely execute code.

Affected products

• Advantech WebAccess: through 9.0.2

References

• https://us-cert.cisa.gov/ics/advisories/icsa-21-285-02
• https://us-cert.cisa.gov/ics/advisories/icsa-21-285-02

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