CVE-2021-32956Network attack vector

User redirection via crafted URL

Published Jun 18, 2021 · Updated Aug 3, 2024

Open redirection in Advantech WebAccess/SCADA 9.0.1 and earlier allows remote attackers to redirect users via a crafted URL. CISA and the CNA record do not identify the affected endpoint, parameter, or redirect-validation error. Exploitation requires a user to follow the attacker-supplied URL; the redirect can carry that user to a malicious webpage.

CVSS severity6.1
Medium
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirection in Advantech WebAccess/SCADA 9.0.1 and earlier allows remote attackers to redirect users via a crafted URL. CISA and the CNA record do not identify the affected endpoint, parameter, or redirect-validation error. Exploitation requires a user to follow the attacker-supplied URL; the redirect can carry that user to a malicious webpage.

The record

CVE
CVE-2021-32956
Published
Jun 18, 2021
Updated
Aug 3, 2024
Vendor
Advantech
Product
WebAccess/SCADA
Classifications
CWE-601, T1566.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=WebAccess/SCADA Versions 9.0.1 and prior

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Advantech · WebAccess/SCADAversion=WebAccess/SCADA Versions 9.0.1 and prior

Published CVSS scores

6.1ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.8NIST NVDAV:N/AC:M/Au:N/C:P/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1566.002Spearphishing Link

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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