CVE-2020-14387
rsync: rsync-ssl does not verify the hostname in the server certificate when using openssl
Severity
ImportantRed Hat Product Security
CVSS 3.1
Review impact separately from score.
Published · September 4, 2020
Updated · November 22, 2025
Description
A flaw was found in rsync in versions since 3.2.0pre1. Rsync improperly validates certificate with host mismatch vulnerability. A remote, unauthenticated attacker could exploit the flaw by performing a man-in-the-middle attack using a valid certificate for another hostname which could compromise confidentiality and integrity of data transmitted using rsync-ssl. The highest threat from this vulnerability is to data confidentiality and integrity.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
This vulnerability can be mitigated by not using rsync-ssl in openssl mode.
CVSS / CWE
CVSS 3.1 · 9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-297 · Improper Validation of Certificate with Host Mismatch