CVE-2021-22663

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-02-09 · updated 2026-06-17
Weakness: CWE-125

Description

Cscape (All versions prior to 9.90 SP3.5) lacks proper validation of user-supplied data when parsing project files. This could lead to an out-of-bounds read. An attacker could leverage this vulnerability to execute code in the context of the current process.

Affected products

Horner Automation Cscape: before 9.90 — fixed in 9.90
Siemens Cscape: 9.90, 9.90-sp1, 9.90-sp3

How to fix

Upgrade to a fixed version: Horner Automation Cscape 9.90. Check the vendor advisory for mitigations.

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-035-02
https://us-cert.cisa.gov/ics/advisories/icsa-21-035-02

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