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Fencer Vulns
high 8.6

CVE-2026-4436 json

GPL Odorizers GPL750 Missing Authentication for Critical Function

published 2026-04-09 7 mo ago modified 2026-10-26 13 d ago also EUVD-2026-21066

cvss
8.6
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

A low-privileged remote attacker can send Modbus packets to manipulate register values that are inputs to the odorant injection logic such that too much or too little odorant is injected into a gas line.

Patch / fix

  • GPL Odorizers GPL750 (XL4) v6.0
  • GPL Odorizers GPL750 (XL4 Prime) v6.0
  • GPL Odorizers GPL Odorizers GPL750 (XL7) v20.0
  • GPL Odorizers GPL Odorizers GPL750 (XL7 Prime) v20.0

Vendor advisories

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

cisa ICSA-26-099-02 updated cvss 8.6

GPL Odorizers GPL750

  • GPL Odorizers GPL750 (XL4 Prime) >=v4.0, <v6.0 GPL Odorizers GPL750 (XL4) >=v1.0, <v6.0 GPL Odorizers GPL750 (XL7 Prime) >=v18.4, <v20.0 GPL Odorizers GPL750 (XL7) >=v13.0, <v20.0
    affected: mitigation “For assistance in updating GPL Odorizers to the latest version, users should reach out to GPL Odorizers directly via phone number (303) 697-6701 during the hours of 8:00 a.m. to 4:00 p.m. MST.” lincenergysystems-my.sharepoint.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
6 mo ago

Exploit prediction

0.46% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 8.6 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N

Affected products

  • GPL Odorizers GPL750 (XL4)
  • GPL Odorizers GPL750 (XL4 Prime)
  • GPL Odorizers GPL Odorizers GPL750 (XL7)
  • GPL Odorizers GPL Odorizers GPL750 (XL7 Prime)

Classification

Weakness
  • CWE-306 Missing Authentication for Critical Functionality

References

Sources

Fencer Vulns 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.