How severe is CVE-2021-33015?

CVE-2021-33015 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-33015 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-33015?

CVE-2021-33015 primarily affects Hornerautomation Cscape. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-33015?

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-2021-33015 published?

CVE-2021-33015 was published on 2021-08-25 and last updated on 2026-06-17.

CVE-2021-33015

CVE-2021-33015 is a high-severity vulnerability in Hornerautomation Cscape with a CVSS 3.x base score of 7.8. 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-824.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (58th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-824
Affected product: Hornerautomation Cscape
Published: 2021-08-25
Last modified: 2026-06-17

Description

Cscape (All Versions prior to 9.90 SP5) lacks proper validation of user-supplied data when parsing project files. This could lead to an out-of-bounds write via an uninitialized pointer. An attacker could leverage this vulnerability to execute code in the context of the current process.

Frequently asked questions

What is CVE-2021-33015?: Cscape (All Versions prior to 9.90 SP5) lacks proper validation of user-supplied data when parsing project files. This could lead to an out-of-bounds write via an uninitialized pointer. An attacker could leverage this vulnerability to execute code in the context of the current process.
How severe is CVE-2021-33015?: CVE-2021-33015 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-33015 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (58th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-33015?: CVE-2021-33015 primarily affects Hornerautomation Cscape. In total, 6 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-33015?: 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-2021-33015 published?: CVE-2021-33015 was published on 2021-08-25 and last updated on 2026-06-17.

References

https://us-cert.cisa.gov/ics/advisories/icsa-21-224-02

Affected products (6)

cpe:2.3:a:hornerautomation:cscape:*:*:*:*:*:*:*:*
cpe:2.3:a:hornerautomation:cscape:9.90:-:*:*:*:*:*:*
cpe:2.3:a:hornerautomation:cscape:9.90:sp1:*:*:*:*:*:*
cpe:2.3:a:hornerautomation:cscape:9.90:sp2:*:*:*:*:*:*
cpe:2.3:a:hornerautomation:cscape:9.90:sp3:*:*:*:*:*:*
cpe:2.3:a:hornerautomation:cscape:9.90:sp4:*:*:*:*:*:*

More vulnerabilities in Hornerautomation Cscape

CVE-2023-7206 — High (CVSS 7.8): In Horner Automation Cscape versions 9.90 SP10 and prior, local attackers are able to exploit this vulnerability if a…
CVE-2023-32203 — High (CVSS 7.8): Horner Automation Cscape lacks proper validation of user-supplied data when parsing project files (e.g., HMI). This…
CVE-2023-31278 — High (CVSS 7.8): Horner Automation Cscape lacks proper validation of user-supplied data when parsing project files (e.g., HMI). This…
CVE-2023-31244 — High (CVSS 7.8): The affected product does not properly validate user-supplied data. If a user opens a maliciously formed CSP file, then…
CVE-2023-29503 — High (CVSS 7.8): The affected application lacks proper validation of user-supplied data when parsing project files (e.g., CSP). This…
CVE-2023-28653 — High (CVSS 7.8): The affected application lacks proper validation of user-supplied data when parsing project files (e.g., CSP). This…

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Other CWE-824 vulnerabilities

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CVE-2022-44451 — Critical (CVSS 9.8): A use of uninitialized pointer vulnerability exists in the MSI format atom functionality of Open Babel 3.1.1 and master…

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