CVE-2015-1821 Memory corruption in n/a

What is CVE-2015-1821?

CVE-2015-1821 is a medium-severity memory corruption vulnerability in Debian Debian Linux, published on 16 Apr 2015. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Heap-based buffer overflow in chrony before 1.31.1 allows remote authenticated users to cause a denial of service (chronyd crash) or possibly execute arbitrary code by configuring the (1) NTP or (2) cmdmon access with a subnet size that is indivisible by four and an address with a nonzero bit in the subnet remainder.

Weakness: CWE-119

Which versions are affected by CVE-2015-1821?

It affects 2 products.

Products include Debian Debian Linux, Tuxfamily Chrony.

How do I fix CVE-2015-1821?

Upgrade to a fixed version.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2015-1821 being exploited?

There is no known exploitation of CVE-2015-1821 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-2015-1821, GHSA-cm73-xw9w-xqmm, UBUNTU-CVE-2015-1821.