What’s Vulnerable › Vulnerabilities

CVE-2021-27420: GE UR family input validation

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-03-23 · updated 2026-06-17
• Weakness: CWE-20

Description

GE UR firmware versions prior to version 8.1x web server task does not properly handle receipt of unsupported HTTP verbs, resulting in the web server becoming temporarily unresponsive after receiving a series of unsupported HTTP requests. When unresponsive, the web server is inaccessible. By itself, this is not particularly significant as the relay remains effective in all other functionality and communication channels.

Affected products

• GE Multilin B30 Firmware: before 8.10 — fixed in 8.10
• GE Multilin B90 Firmware: before 8.10 — fixed in 8.10
• GE Multilin C30 Firmware: before 8.10 — fixed in 8.10
• GE Multilin C60 Firmware: before 8.10 — fixed in 8.10
• GE Multilin C70 Firmware: before 8.10 — fixed in 8.10
• GE Multilin C95 Firmware: before 8.10 — fixed in 8.10
• GE Multilin D30 Firmware: before 8.10 — fixed in 8.10
• GE Multilin D60 Firmware: before 8.10 — fixed in 8.10
• GE Multilin F35 Firmware: before 8.10 — fixed in 8.10
• GE Multilin F60 Firmware: before 8.10 — fixed in 8.10
• GE Multilin G30 Firmware: before 8.10 — fixed in 8.10
• GE Multilin G60 Firmware: before 8.10 — fixed in 8.10
• GE Multilin L30 Firmware: before 8.10 — fixed in 8.10
• GE Multilin L60 Firmware: before 8.10 — fixed in 8.10
• GE Multilin L90 Firmware: before 8.10 — fixed in 8.10
• GE Multilin M60 Firmware: before 8.10 — fixed in 8.10
• GE Multilin N60 Firmware: before 8.10 — fixed in 8.10
• GE Multilin T35 Firmware: before 8.10 — fixed in 8.10
• GE Multilin T60 Firmware: before 8.10 — fixed in 8.10

How to fix

Upgrade to a fixed version: GE Multilin B30 Firmware 8.10; GE Multilin B90 Firmware 8.10; GE Multilin C30 Firmware 8.10; GE Multilin C60 Firmware 8.10; GE Multilin C70 Firmware 8.10; GE Multilin C95 Firmware 8.10; GE Multilin D30 Firmware 8.10; GE Multilin D60 Firmware 8.10; GE Multilin F35 Firmware 8.10; GE Multilin F60 Firmware 8.10; GE Multilin G30 Firmware 8.10; GE Multilin G60 Firmware 8.10. Check the vendor advisory for mitigations.

References

• https://www.cisa.gov/uscert/ics/advisories/icsa-21-075-02
• https://www.gegridsolutions.com/Passport/Login.aspx
• https://www.cisa.gov/uscert/ics/advisories/icsa-21-075-02
• https://www.gegridsolutions.com/Passport/Login.aspx

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