CVE-2025-56234
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-29

Last updated on: 2025-10-28

Assigner: MITRE

Description
AT_NA2000 from Nanda Automation Technology vendor has a denial-of-service vulnerability. For the processing of TCP RST packets, PLC AT_NA2000 has a wide acceptable range of sequence numbers. It does not require the sequence number to exactly match the next expected sequence value, just to be within the current receive window, which violates RFC5961. This flaw allows attackers to send multiple random TCP RST packets to hit the acceptable range of sequence numbers, thereby interrupting normal connections and causing a denial-of-service attack.
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Meta Information
Published
2025-09-29
Last Modified
2025-10-28
Generated
2026-06-16
AI Q&A
2025-09-29
EPSS Evaluated
2026-06-15
NVD
CVE-2025-56234
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
nanda_automation_technology at_na2000 *
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Exploitability
CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.
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Executive Summary

This vulnerability exists in the AT_NA2000 device from Nanda Automation Technology. It is a denial-of-service flaw related to how the device processes TCP RST packets. The device accepts a wide range of TCP sequence numbers for these packets instead of requiring an exact match to the next expected sequence number, violating RFC5961. Attackers can exploit this by sending multiple random TCP RST packets within the acceptable sequence number range, causing interruptions to normal connections and resulting in a denial-of-service condition.

Impact Analysis

This vulnerability can impact you by allowing attackers to disrupt normal network connections to the AT_NA2000 device. By sending crafted TCP RST packets, attackers can cause denial-of-service attacks that interrupt communication and potentially affect the availability and reliability of the device and any systems depending on it.

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