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Date: Wed, 26 May 2021 14:15:38 -0800
From: Michael McNally <>
Cc: "" <>
Subject: ISC has disclosed a vulnerability in ISC DHCP (CVE-2021-25217)

On May 26, 2021, we (Internet Systems Consortium) disclosed a
vulnerability affecting our ISC DHCP software:

    CVE-2021-25217: A buffer overrun in lease file parsing code can be
    used to exploit a common vulnerability shared by dhcpd and dhclient

New versions of ISC DHCP are available from

Operators and package maintainers who prefer to apply patches selectively can
find individual vulnerability-specific patches in the "patches" subdirectory
of the release directories for our two stable release branches (4.4 and 4.1-ESV)

With the public announcement of this vulnerability, the embargo
period is ended and any updated software packages that have been
prepared may be released.


Michael McNally
(for ISC Security Officer)

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