How severe is CVE-2019-6521?

CVE-2019-6521 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.

Is CVE-2019-6521 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-6521?

CVE-2019-6521 affects Advantech Webaccess/scada. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-6521?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-6521 published?

CVE-2019-6521 was published on 2019-02-05 and last updated on 2026-06-17.

CVE-2019-6521

CVE-2019-6521 is a high-severity vulnerability in Advantech Webaccess/scada with a CVSS 3.x base score of 8.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: High (CVSS 3.x base score 8.6)
CVSS v2: 7.5
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Advantech Webaccess/scada
Published: 2019-02-05
Last modified: 2026-06-17

Description

WebAccess/SCADA, Version 8.3. Specially crafted requests could allow a possible authentication bypass that could allow an attacker to obtain and manipulate sensitive information.

Frequently asked questions

What is CVE-2019-6521?: WebAccess/SCADA, Version 8.3. Specially crafted requests could allow a possible authentication bypass that could allow an attacker to obtain and manipulate sensitive information.
How severe is CVE-2019-6521?: CVE-2019-6521 has a CVSS 3.x base score of 8.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity low, and availability low.
Is CVE-2019-6521 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-6521?: CVE-2019-6521 affects Advantech Webaccess/scada. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-6521?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-6521 published?: CVE-2019-6521 was published on 2019-02-05 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:advantech:webaccess\/scada:8.3:*:*:*:*:*:*:*

More vulnerabilities in Advantech Webaccess/scada

CVE-2023-1437 — Critical (CVSS 9.8): All versions prior to 9.1.4 of Advantech WebAccess/SCADA are vulnerable to use of untrusted pointers. The RPC arguments…
CVE-2021-32943 — Critical (CVSS 9.8): The affected product is vulnerable to a stack-based buffer overflow, which may allow an attacker to remotely execute…
CVE-2019-6523 — Critical (CVSS 9.8): WebAccess/SCADA, Version 8.3. The software does not properly sanitize its inputs for SQL commands.
CVE-2019-6519 — Critical (CVSS 9.8): WebAccess/SCADA, Version 8.3. An improper authentication vulnerability exists that could allow a possible…
CVE-2025-14849 — High (CVSS 8.8): Advantech WebAccess/SCADA is vulnerable to unrestricted file upload, which may allow an attacker to remotely execute…
CVE-2021-22669 — High (CVSS 8.8): Incorrect permissions are set to default on the ‘Project Management’ page of WebAccess/SCADA portal of…

All CVEs affecting Advantech Webaccess/scada →

Other CWE-287 (Improper Authentication) vulnerabilities

CVE-2026-45480 — Critical (CVSS 10.0): Improper authentication in Azure Active Directory allows an unauthorized attacker to elevate privileges over a network.
CVE-2026-46389 — Critical (CVSS 10.0): UDS Identity Config builds the Keycloak configuration image (realm, plugins, theme, truststore, JARs) consumed by UDS…
CVE-2026-10611 — Critical (CVSS 10.0): An authentication bypass vulnerability exists in MISP when LDAP mixed authentication is enabled with OTP enforcement.…
CVE-2026-47280 — Critical (CVSS 10.0): Improper authentication in Azure Resource Manager (ARM) allows an unauthorized attacker to elevate privileges over a…
CVE-2026-42822 — Critical (CVSS 10.0): Improper authentication in Azure Local Disconnected Operations allows an unauthorized attacker to elevate privileges…
CVE-2026-20182 — Critical (CVSS 10.0): May 2026: This security advisory provides the details and fix information for a vulnerability that was discovered and…

Browse all CWE-287 (Improper Authentication) vulnerabilities →