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  4. CVE 2026 62973 bacnet stack remote global buffer overflow read
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Back to active CVEs
High · CVSS 7.5CVE-2026-62973

BACnet Stack: Remote Global-Buffer-Overflow Read in readpropm via Malformed ReadPropertyMultiple-ACKCVE-2026-62973

Answer in brief

CVE-2026-62973 records a High severity (CVSS 7.5) vulnerability in BACnet Stack: Remote Global-Buffer-Overflow Read in readpropm via Malformed ReadPropertyMultiple-ACK. The current sources do not mark it as known exploited. The current feed maps bacnet-stack/bacnet-stack (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 13, 2026Updated Nov 13, 2026Source checked Nov 13, 2026First seen by HOL Nov 13, 2026Material review Nov 13, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps bacnet-stack/bacnet-stack (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
bacnet-stack/bacnet-stackgeneric<1.4.5 || <1.5.1 || <1.6.01.4.5, 1.5.1, 1.6.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for bacnet-stack/bacnet-stack.
  2. 2Review the reported fix. Update bacnet-stack/bacnet-stack to 1.4.5 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 13, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 13, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

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.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • BACnet Stack: Uncontrolled recursion in Timer object writeback path leads to remote server stack overflowSame bacnet-stack/bacnet-stack package
  • BACnet Stack: AtomicReadFile/AtomicWriteFile stream fileStartPosition validation flaw causes out-of-bounds read/write in RAM file backendsSame bacnet-stack/bacnet-stack package
  • BACnet Stack: Global APDU transmit buffer out-of-bounds write in device.address-binding response encoding via address_list_encode()Same bacnet-stack/bacnet-stack package
  • BACnet Stack: Buffer overflows in bsc_node_parse_urls() (BACnet/SC Address Resolution ACK URL parser)Same bacnet-stack/bacnet-stack package
  • BACnet Stack: Denial of Service (Infinite Loop) in handler_read_property_multiple via malformed RPM requestsSame bacnet-stack/bacnet-stack package
  • BACnet Stack: bacnet_device.c stack-use-after-return in writable Device string propertiesSame bacnet-stack/bacnet-stack package

Record context

Vulnerability class
Buffer Overflow
EPSS
Not reported
CWE IDs
CWE-125
Source
CVE List V5
Source checked
Nov 13, 2026
References
2 linked sources
Open source record