CVE-2026-4433Network attack vector

Host service disclosure via ostunnel GatewayPorts

Published Mar 24, 2026 · Updated Mar 24, 2026

SSH misconfiguration in Tenable OT Platform 3.18.58 through 4.2.40 allows remote authenticated users to read host service data. The ostunnel user's SSH configuration enables GatewayPorts, exposing socket, port, and service details through forwarded listening endpoints. Access to the ostunnel account is required, and the disclosed network metadata can aid subsequent attempts to compromise the host.

CVSS severity5.4
Medium
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SSH misconfiguration in Tenable OT Platform 3.18.58 through 4.2.40 allows remote authenticated users to read host service data. The ostunnel user's SSH configuration enables GatewayPorts, exposing socket, port, and service details through forwarded listening endpoints. Access to the ostunnel account is required, and the disclosed network metadata can aid subsequent attempts to compromise the host.

The record

CVE
CVE-2026-4433
Published
Mar 24, 2026
Updated
Mar 24, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-16
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 24, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.9TenableCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:C
5.4TenableCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
1.9TenableCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-16Misconfiguration

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

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