CVE-2022-21155

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-04-13. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.1%CVSS: 7.5Exploit: None knownExposed services: Not assessed

Fernhill recommends users upgrade to Version 3.78 or later: https://www.fernhillsoftware.com/download.php For more information about this issue and how to apply the upgrade, please contact Fernhill online (https://www.f… (from the CVE record's solution, Cybersecurity and Infrastructure Security Agency (CISA) Industrial Control Systems (ICS)) — apply it.

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.

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
The EG Score, 7.5 of 10.
Exploitation1.1% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: Fernhill recommends users upgrade to Version 3.78 or later: https://www.fernhillsoftware.com/download.php For more information about this issue and how to apply the upgrade, please contact Fernhill online (https://www.f… (from the CVE record's solution, Cybersecurity and Infrastructure Security Agency (CISA) Industrial Control Systems (ICS)). Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
1.1%
EPSS %ILE
65th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Attend at high (mission-essential systems).

Fernhill recommends users upgrade to Version 3.78 or later: https://www.fernhillsoftware.com/download.php For more information about this issue and how to apply the upgrade, please contact Fernhill online (https://www.f… (from the CVE record's solution, Cybersecurity and Infrastructure Security Agency (CISA) Industrial Control Systems (ICS)). Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

Published

April 12, 2022

Last Modified

November 21, 2024

References (1)

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 23× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 87 of 154 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 13 repeat rows among the latest 100 are merged into the row they repeat. The 67 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 13:44 UTCEPSS rescoreEPSS 1.1% · 65th percentile
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Frequently asked(5)

What is CVE-2022-21155?
CVE-2022-21155 is a high-severity vulnerability; its CVE record was published on April 12, 2022. 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.
When was the CVE record for CVE-2022-21155 published?
The CVE record for CVE-2022-21155 was published on April 12, 2022. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of November 21, 2024; the record at its source may have been updated since.
Is CVE-2022-21155 actively exploited?
CVE-2022-21155 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.1% probability of exploitation in the next 30 days (65th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2022-21155?
CVE-2022-21155 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2022-21155?
The CVE record's solution for CVE-2022-21155, written by its CNA Cybersecurity and Infrastructure Security Agency (CISA) Industrial Control Systems (ICS), names the fix: "Fernhill recommends users upgrade to Version 3.78 or later: https://www.fernhillsoftware.com/download.php For more information about this issue and how to apply the upgrade, please contact Fernhill online (https://www.f…"

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