CVE-2021-27420

Name: CVE-2021-27420
Creator: NVD / NIST
Published: 2022-03-23T20:15:08.31+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.02%

Last modified Jun 17, 2026

CVE-2021-27420 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 1.02% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

EPSS Probability

1.02%

59.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ge	Multilin B30 Firmware	< 8.10
Ge	Multilin B90 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
Ge	Multilin L30 Firmware	< 8.10
Ge	Multilin L60 Firmware	< 8.10
Ge	Multilin L90 Firmware	< 8.10
Ge	Multilin M60 Firmware	< 8.10
Ge	Multilin N60 Firmware	< 8.10
Ge	Multilin T35 Firmware	< 8.10
Ge	Multilin T60 Firmware	< 8.10
Ge	Multilin C30 Firmware	< 8.10

References

https://www.cisa.gov/uscert/ics/advisories/icsa-21-075-02Mitigation, Third Party Advisory, US Government Resource
https://www.gegridsolutions.com/Passport/Login.aspxPermissions Required, Vendor Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-21-075-02Mitigation, Third Party Advisory, US Government Resource
https://www.gegridsolutions.com/Passport/Login.aspxPermissions Required, Vendor Advisory

Timeline

Published: Mar 23, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27420?

How severe is CVE-2021-27420?

CVE-2021-27420 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.02% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27420?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-27420?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST