No exploitation reportedFix available

CVE-2021-27428

Q: Is CVE-2021-27428 actively exploited?

Active exploitation of CVE-2021-27428 has not been confirmed. Its EPSS score was 1.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-27428?

CVE-2021-27428 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2022-03-23
Fixed in8.10
WeaknessCWE-434

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

GE UR IED firmware versions prior to version 8.1x supports upgrading firmware using UR Setup configuration tool – Enervista UR Setup. This UR Setup tool validates the authenticity and integrity of firmware file before uploading the UR IED. An illegitimate user could upgrade firmware without appropriate privileges. The weakness is assessed, and mitigation is implemented in firmware Version 8.10.

Timeline

dates in UTC

2022-03-2320:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-27428?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-27428?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Ge multilin b30 firmwareversion to verify

Branch	Affected	Fixed in	Source
8.10	< 8.10	8.10	NVD

Ge multilin b90 firmwareversion to verify

Branch	Affected	Fixed in	Source
8.10	< 8.10	8.10	NVD

Ge multilin c30 firmwareversion to verify

Branch	Affected	Fixed in	Source
8.10	< 8.10	8.10	NVD

16 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-075-02 CISA19 known affected
GE UR Family (Update A)
GE Veronva UR B30: <8.10 · GE Veronva UR B90: <8.10 · GE Veronva UR C30: <8.10 · +16 more

Full record on NVD

Fix

Update Ge multilin b30 firmware to 8.10
Vendor fix CISA ICSA-21-075-02 · 19 productsGE strongly recommends users with impacted firmware versions update their UR devices to UR firmware Version 8.10 or greater to resolve these vulnerabilities. GE provides additional mitigations and information about these vulnerabilities in GE Publication Number: GES-2021-004 at https://www.gegridso…
Mitigation from the vendor CISA ICSA-21-075-02 · 19 productsGE recommends protecting UR IED by using network defense-in-depth practices. This includes, but is not limited to, placing UR IED inside the control system network security perimeter, and having access controls, monitoring (such as an Intrusion Detection System), and other mitigating technologies i…
Mitigation from the vendor CISA ICSA-21-075-02 · 19 productsGE recommends users refer to the UR Deployment guide for secure configuration of UR IED and system.

Advisories and patches

www.cisa.govMitigation
www.gegridsolutions.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-04-16
OpenCVESSVC decisionnone—
CNACVSS 3.19.8read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
CNAweakness (CWE)CWE-434read 2026-10-23
NVDweakness (CWE)CWE-434read 2026-10-23
FIRST EPSSEPSS score1.2 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2022-03-23
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-27428?

Is CVE-2021-27428 actively exploited?

Active exploitation of CVE-2021-27428 has not been confirmed. Its EPSS score was 1.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-27428?

CVE-2021-27428 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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