What is CVE-2021-27420?

CVE-2021-27420 is a medium-severity vulnerability in Ge Multilin B30, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2022-03-23.

How severe is CVE-2021-27420?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Improper input validation in Ge Multilin B30

CVE-2021-27420

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2022-03-23 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

EPSS exploit prediction

EPSS: 0.011 (64.0th percentile), scored 2026-10-20.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.cisa.gov/uscert/ics/advisories/icsa-21-075-02 (US Government Resource, Third Party Advisory, Mitigation)
www.gegridsolutions.com/Passport/Login.aspx (Vendor Advisory, Permissions Required)

Frequently asked questions

What is CVE-2021-27420?: CVE-2021-27420 is a medium-severity vulnerability in Ge Multilin B30, classified under Improper Input Validation. CVSS score: 5.3/10. Published 2022-03-23.
How severe is CVE-2021-27420?: Medium severity. CVSS v3 base score is 5.3 out of 10.