CVE-2014-9751 Security feature bypass in n/a

What is CVE-2014-9751?

CVE-2014-9751 is a medium-severity vulnerability in Debian Debian Linux, published on 4 Oct 2015. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-20

Which versions are affected by CVE-2014-9751?

It affects 6 products.

Products include Debian Debian Linux, Ntp Ntp, Oracle Linux, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Server, Redhat Enterprise Linux Workstation.

How do I fix CVE-2014-9751?

Upgrade to a fixed version.

Is CVE-2014-9751 being exploited?

There is no known exploitation of CVE-2014-9751 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as DEBIAN-CVE-2014-9751, GHSA-ffj6-rf7h-c479.