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Date: Thu, 26 Aug 2021 11:58:35 -0300
From: Marco Benatto <>
Subject: libssh: Possible heap-buffer overflow when rekeying (CVE-2021-3634)

Hello all,

a new vulnerability was made public today for libssh. It involves a
possible heap-buffer overflow when rekeying and had CVE-2021-3634
assigned to it.

Vulnerability summary:

"A malicious attacker can request rekey with key exchange algorithm
with digest of different size, causing libssh reading or writing
behind the buffer limits."

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:L/ (5.3)

You can find more detailed information regarding this issue on
libssh's security advisory:


Marco Benatto
Red Hat Product Security for urgent response

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