CVE-2023-35794Public exploitNetwork attack vector

Gateway shell hijacking via missing session validation

Published Oct 27, 2023 · Updated Aug 2, 2024

Authentication bypass in Cassia Access Controller 2.1.1.2303271039 allows remote authenticated users to hijack gateway Web SSH sessions. The /ssh/host route enters a WebSSH2 session without validating the Access Controller portal cookie, while a 401 response instead solicits Basic Authentication credentials for the gateway. Exploitation requires an established gateway session plus its MAC address and SSH credentials; unchanged default gateway credentials provide root access.

CVSS severity8.8
High
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in Cassia Access Controller 2.1.1.2303271039 allows remote authenticated users to hijack gateway Web SSH sessions. The /ssh/host route enters a WebSSH2 session without validating the Access Controller portal cookie, while a 401 response instead solicits Basic Authentication credentials for the gateway. Exploitation requires an established gateway session plus its MAC address and SSH credentials; unchanged default gateway credentials provide root access.

The record

CVE
CVE-2023-35794
Published
Oct 27, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-287, T1133
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-287Improper Authentication
T1133External Remote Services

Public exploit references

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

Technologies

Your stack

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Your stack

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