Honeywell C300 PCNT02 Control Data Access memory corruption

Summaryinfo

A vulnerability classified as critical has been found in Honeywell C300 PCNT02, C300 PCNT05, FIM4, FIM8, UOC, CN100, HCA, C300PM, C200E and Wireless Device Manager. This affects an unknown function of the component Control Data Access. The manipulation leads to memory corruption. This vulnerability is traded as CVE-2025-2521. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Honeywell C300 PCNT02, C300 PCNT05, FIM4, FIM8, UOC, CN100, HCA, C300PM, C200E and Wireless Device Manager and classified as critical. This issue affects some unknown processing of the component Control Data Access. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

The Honeywell Experion PKS and OneWireless WDM contains a Memory Buffer vulnerability in the component Control Data Access (CDA). An attacker could potentially exploit this vulnerability, leading to an Overread Buffers, which could result in improper index validation against buffer borders leading to remote code execution. Honeywell recommends updating to the most recent version of Honeywell Experion PKS: 520.2 TCU9 HF1 and 530.1 TCU3 HF1 and OneWireless: 322.5 and 331.1. The affected Experion PKS products are C300 PCNT02, C300 PCNT05, FIM4, FIM8, UOC, CN100, HCA, C300PM, and C200E. The Experion PKS versions affected are from 520.1 through 520.2 TCU9 and from 530 through 530 TCU3.The OneWireless WDM affected versions are 322.1 through 322.4 and 330.1 through 330.3.

The identification of this vulnerability is CVE-2025-2521 since 03/19/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/11/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Honeywell

Name

• C200E
• C300 PCNT02
• C300 PCNT05
• C300PM
• CN100
• FIM4
• FIM8
• HCA
• UOC
• Wireless Device Manager

License

• commercial

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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