CVE-2015-7855 Denial of service in n/a

What is CVE-2015-7855?

CVE-2015-7855 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 7 Aug 2017. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

The decodenetnum function in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to cause a denial of service (assertion failure) via a 6 or mode 7 packet containing a long data value.

Weakness: CWE-20

Which versions are affected by CVE-2015-7855?

It affects 9 products.

Products include Debian Debian Linux, Netapp Clustered Data Ontap, Netapp Data Ontap, Netapp Oncommand Balance, Netapp Oncommand Performance Manager, Netapp Oncommand Unified Manager and 3 more.

How do I fix CVE-2015-7855?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2015-7855 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2015-7855 exists.

Public exploit code: 1 Exploit-DB entry.

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-2015-7855, GHSA-wmrv-mc39-vj78, UBUNTU-CVE-2015-7855.