CyberSecBulletin
CVE-2026-33367NVD status: Awaiting Analysis

700 Series: Missing Authentication for Critical Functionality

Published Updated By the CyberSecBulletin desk

CVE-2026-33367 is a high-severity missing authentication for critical functionality vulnerability in 700 Series from Red Lion Controls, with a CVSS 3.1 base score of 8.1 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists versions Firmware Versions 3.11.0, Bootloader Versions 2.0.6.1 as the first without the flaw, so updating 700 Series to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.29% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update 700 Series to Firmware Versions 3.11.0 or Bootloader Versions 2.0.6.1, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
Red Lion Controls700 Seriesbefore Firmware Versions 3.11.0; before Bootloader Versions 2.0.6.1Firmware Versions 3.11.0, Bootloader Versions 2.0.6.1

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
NetworkCan be exploited remotely over a network, including the internet.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
HighData or code can be modified at will.
Availability
NoneAvailability is not affected.

Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N. Scored by CNA (hq.dhs.gov).

Scoring systemScoreSeverityScored by
CVSS 4.09.3CriticalCNA (hq.dhs.gov)
CVSS 3.18.1HighCNA (hq.dhs.gov)

Official description

SNMP can be used to perform administrative actions such as retrieving configuration files, modifying user accounts or device settings, and initiating firmware or bootloader upgrades or downgrades—all without any authentication.

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Missing Authentication for Critical Functionality

The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

How developers prevent this class of flaw

  • For any security checks that are performed on the client side, ensure that these checks are duplicated on the server side, in order to avoid CWE-602. Attackers can bypass the client-side checks by modifying values after the checks have been performed, or by changing the client to remove the client-side checks entirely. Then, these modified values would be submitted to the server.
  • Use a vetted library or framework that does not allow this weakness to occur or provides constructs that make this weakness easier to avoid. For example, consider using libraries with authentication capabilities such as OpenSSL or the ESAPI Authenticator.
  • When storing data in the cloud (e.g., S3 buckets, Azure blobs, Google Cloud Storage, etc.), use the provider's controls to require strong authentication for users who should be allowed to access the data.

More Missing Authentication for Critical Functionality vulnerabilities (CWE-306)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
  3. Record last changed materially (score, affected products, status or references).

References

Other vulnerabilities in 700 Series

All 700 Series vulnerabilities

Recent Missing Authentication for Critical Functionality vulnerabilities

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