CVE-2026-21878

HIGH
2026-02-13 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 22:02 vuln.today
PoC Detected
Feb 18, 2026 - 18:49 vuln.today
Public exploit code
Patch Released
Feb 18, 2026 - 18:49 nvd
Patch available
CVE Published
Feb 13, 2026 - 19:17 nvd
HIGH 7.5

Tags

Path Traversal Bacnet Stack

Description

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. Prior to 1.5.0.rc3, a vulnerability has been discovered in BACnet Stack's file writing functionality where there is no validation of user-provided file paths, allowing attackers to write files to arbitrary directories. This affects apps/readfile/main.c and ports/posix/bacfile-posix.c. This vulnerability is fixed in 1.5.0.rc3.

Analysis

BACnet Stack is a BACnet open source protocol stack C library for embedded systems. [CVSS 7.5 HIGH]

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Remediation

Within 24 hours: Identify all systems and devices running BACnet Stack and document their criticality; assess network exposure of affected assets. Within 7 days: Prioritize patching of critical and exposed BACnet systems; coordinate with equipment vendors for patch availability and compatibility testing. …

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Priority Score

58
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +38
POC: +20

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CVE-2026-21878 vulnerability details – vuln.today
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