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Fencer Intel
medium 5.3

CVE-2021-27420 json

GE UR family input validation

published 4y ago modified 4mo ago also EUVD-2021-14174

cvss
5.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

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.

Patch / fix

  • GE UR family 8.1x

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-075-02 updated cvss 5.3

GE UR Family (Update A)

  • GE Veronva UR B30 <8.10 GE Veronva UR B90 <8.10 GE Veronva UR C30 <8.10 GE Veronva UR C60 <8.10 GE Veronva UR C70 <8.10 GE Veronva UR C95 <8.10
    +13 more products
    GE Veronva UR D30 <8.10 GE Veronva UR D60 <8.10 GE Veronva UR F35 <8.10 GE Veronva UR F60 <8.10 GE Veronva UR G30 <8.10 GE Veronva UR G60 <8.10 GE Veronva UR L30 <8.10 GE Veronva UR L60 <8.10 GE Veronva UR L90 <8.10 GE Veronva UR M60 <8.10 GE Veronva UR N60 <8.10 GE Veronva UR T35 <8.10 GE Veronva UR T60 <8.10
    affected: vendor fix, mitigation “GE recommends users refer to the UR Deployment guide for secure configuration of UR IED and system.” gegridsolutions.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
last yr.

Exploit prediction

1.03% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 3.1 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Affected products

  • GE UR family

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.