PatchTheCVECVE-2021-27428: GE UR IED firmware versions prior to version 8.1x supports upgrading firmware using UR Setup configuration too
CVE-2021-27428 is a critical-severity flaw (CVSS 9.8) affecting multilin b30 firmware, multilin b90 firmware, multilin c60 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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.
Why this priority
- Critical severity
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 1.2% (top 32%) |
| CISA exploited list | No |
| Weakness | CWE-434 |
| Published | 2022-03-23 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2021-27428?
multilin b30 firmware: upgrade to 8.10; multilin b90 firmware: upgrade to 8.10; multilin c60 firmware: upgrade to 8.10. Exact commands for each OS are on this page.
Is CVE-2021-27428 being exploited?
CVE-2021-27428 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2021-27428 affect?
CVE-2021-27428 affects multilin b30 firmware, multilin b90 firmware, multilin c60 firmware. Severity is critical (CVSS 9.8). 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.
How urgent is CVE-2021-27428?
Priority 56/100. Critical severity; Remotely exploitable, no login, no user action
Related CVEs
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- CVE-2021-27418 MEDIUM 5.3 UPGRADE UPGRADE GE UR firmware versions prior to version 8.1x supports web interface with read-only access