How severe is CVE-2022-21155?

CVE-2022-21155 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2022-21155 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2022-21155?

CVE-2022-21155 affects Fernhillsoftware Scada Server. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2022-21155?

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-2022-21155 published?

CVE-2022-21155 was published on 2022-04-12 and last updated on 2026-06-17.

CVE-2022-21155

CVE-2022-21155 is a high-severity vulnerability in Fernhillsoftware Scada Server with a CVSS 3.x base score of 7.5. 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-755.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (61st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-755
Affected product: Fernhillsoftware Scada Server
Published: 2022-04-12
Last modified: 2026-06-17

Description

A specially crafted packet sent to the Fernhill SCADA Server Version 3.77 and earlier may cause an exception, causing the server process (FHSvrService.exe) to exit.

Frequently asked questions

What is CVE-2022-21155?: A specially crafted packet sent to the Fernhill SCADA Server Version 3.77 and earlier may cause an exception, causing the server process (FHSvrService.exe) to exit.
How severe is CVE-2022-21155?: CVE-2022-21155 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2022-21155 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (61st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2022-21155?: CVE-2022-21155 affects Fernhillsoftware Scada Server. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2022-21155?: 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-2022-21155 published?: CVE-2022-21155 was published on 2022-04-12 and last updated on 2026-06-17.

References

https://www.cisa.gov/uscert/ics/advisories/icsa-22-006-02

Affected products (1)

cpe:2.3:a:fernhillsoftware:scada_server:*:*:*:*:*:*:*:*

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