How severe is CVE-2021-27426?

CVE-2021-27426 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-27426 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-27426?

CVE-2021-27426 primarily affects Ge Multilin B30 Firmware. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-27426?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-27426 published?

CVE-2021-27426 was published on 2022-03-23 and last updated on 2026-06-17.

CVE-2021-27426

CVE-2021-27426 is a critical-severity vulnerability in Ge Multilin B30 Firmware with a CVSS 3.x base score of 9.8. 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-453.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-453
Affected product: Ge Multilin B30 Firmware
Published: 2022-03-23
Last modified: 2026-06-17

Description

GE UR IED firmware versions prior to version 8.1x with “Basic” security variant does not allow the disabling of the “Factory Mode,” which is used for servicing the IED by a “Factory” user.

Frequently asked questions

What is CVE-2021-27426?: GE UR IED firmware versions prior to version 8.1x with “Basic” security variant does not allow the disabling of the “Factory Mode,” which is used for servicing the IED by a “Factory” user.
How severe is CVE-2021-27426?: CVE-2021-27426 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-27426 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-27426?: CVE-2021-27426 primarily affects Ge Multilin B30 Firmware. In total, 19 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-27426?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-27426 published?: CVE-2021-27426 was published on 2022-03-23 and last updated on 2026-06-17.

References

Affected products (19)

cpe:2.3:o:ge:multilin_b30_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_b90_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_c60_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_c70_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_c95_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_d30_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_d60_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_f35_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_f60_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_g30_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_g60_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_l30_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_l60_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_l90_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_m60_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_n60_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_t35_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_t60_firmware:*:*:*:*:*:*:*:*
cpe:2.3:o:ge:multilin_c30_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Ge Multilin B30 Firmware

CVE-2021-27428 — Critical (CVSS 9.8): GE UR IED firmware versions prior to version 8.1x supports upgrading firmware using UR Setup configuration tool –…
CVE-2021-27422 — High (CVSS 7.5): GE UR firmware versions prior to version 8.1x web server interface is supported on UR over HTTP protocol. It allows…
CVE-2021-27424 — Medium (CVSS 5.3): GE UR firmware versions prior to version 8.1x shares MODBUS memory map as part of the communications guide. GE was made…
CVE-2021-27420 — Medium (CVSS 5.3): GE UR firmware versions prior to version 8.1x web server task does not properly handle receipt of unsupported HTTP…
CVE-2021-27418 — Medium (CVSS 5.3): GE UR firmware versions prior to version 8.1x supports web interface with read-only access. The device fails to…

All CVEs affecting Ge Multilin B30 Firmware →

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