What’s Vulnerable › Vulnerabilities

CVE-2015-1821

• Severity: medium (CVSS 6.5 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2015-04-16 · updated 2026-06-17
• Weakness: CWE-119

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.

Affected products

• Debian Linux: 7.0
• chrony: through 1.31

References

• http://listengine.tuxfamily.org/chrony.tuxfamily.org/chrony-announce/2015/04/msg00002.html
• http://www.debian.org/security/2015/dsa-3222
• http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
• http://www.securityfocus.com/bid/73955
• https://security.gentoo.org/glsa/201507-01
• http://listengine.tuxfamily.org/chrony.tuxfamily.org/chrony-announce/2015/04/msg00002.html
• http://www.debian.org/security/2015/dsa-3222
• http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
• http://www.securityfocus.com/bid/73955
• https://security.gentoo.org/glsa/201507-01

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