Rockwell Automation Modbus TCP AOI Server Could Leak Sensitive Information
Priority LOW 26CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · None
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-200.
Summary
Rockwell Automation Modbus TCP Server AOI prior to 2.04.00 is vulnerable to an unauthorized user sending a malformed message that could cause the controller to respond with a copy of the most recent response to the last valid request. If exploited, an unauthorized user could read the connected device’s Modbus TCP Server AOI information.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00849 58th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Rockwell | Modbus TCP Server Add On Instructions | 2.00.00 - 2.00.03 | — | No fix listed | CNA |
- Modbus TCP Server Add On Instructions VendorRockwell Affected 2.00.00 - 2.00.03 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rockwellautomation:modbus_tcp_server_add_on_instructions:*:*:*:*:*:*:*:* | 2.00.00 to before 2.04.00 | Vulnerable | Rockwell |
- cpe:2.3:a:rockwellautomation:modbus_tcp_server_add_on_instructions:*:*:*:*:*:*:*:* Versions 2.00.00 to before 2.04.00 Vulnerable ·Rockwell
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-0027
- 2026-10-03 Alias added: GHSA-fj78-7vc8-pxrm
References
Sources
- CVE-2023-0027 · CVE Program
- CVE-2023-0027 · NVD
- FIRST EPSS
- GHSA-fj78-7vc8-pxrm · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences