BACnet Stack up to 1.4.4/1.5.0/1.5.x ReadPropertyMultiple readpropm out-of-bounds

Summaryinfo

A vulnerability, which was classified as critical, has been found in BACnet Stack up to 1.4.4/1.5.0/1.5.x. Affected by this vulnerability is the function readpropm of the component ReadPropertyMultiple. Performing a manipulation results in out-of-bounds. This vulnerability is identified as CVE-2026-62973. The attack can be initiated remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in BACnet Stack up to 1.4.4/1.5.0/1.5.x. This affects the function readpropm of the component ReadPropertyMultiple. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to versions 1.4.5, 1.5.1, and 1.6.0, a remote out-of-bounds read exists in the official BACnet client application apps/readpropm in bacnet-stack commit e2bdbf6. When readpropm sends a legitimate ReadPropertyMultiple request to a malicious BACnet/IP peer, the peer can reply with a malformed but structurally valid ReadPropertyMultiple-ACK that drives the client into a global-buffer-overflow read on the global receive buffer Rx_Buf. This issue has been patched in versions 1.4.5, 1.5.1, and 1.6.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-62973 since 07/15/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 1.4.5, 1.5.1 or 1.6.0 eliminates this vulnerability. Applying the patch e2bdbf6 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• BACnet Stack

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.4.0
• 1.4.1
• 1.4.2
• 1.4.3
• 1.4.4
• 1.5
• 1.5.0

CPE 2.3info

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CPE 2.2info

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