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Fencer Vulns
high 7.4

CVE-2020-14387 json

A flaw was found in rsync in versions since 3.2.0pre1.

published 2021-05-27 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-6527

cvss
7.4
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 66%
public exploits
0
none known

Summary

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. This flaw affects rsync versions before 3.2.4.

Patch / fix

  • samba rsync 3.2.4
  • rsync Debian 14, Debian 13, Debian 12 3.2.3-3

debian advisories DEBIAN-CVE-2020-14387

  • rsync SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES for SAP 15 SP1 +13 more 3.2.3-150000.4.23.2

suse advisories SUSE-RU-2023:3370-1

  • rsync openSUSE Tumbleweed 3.2.3-2.6

opensuse advisories openSUSE-SU-2024:11308-1

  • rsync Alpine 3.15, Alpine 3.14, Alpine 3.13 3.2.4-r0

alpine advisories ALPINE-CVE-2020-14387

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • rsync CBL-Mariner 2.0 3.2.3-2

azure linux advisories AZL-7462

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • rsync Arch Linux 3.2.3-2

arch linux advisories AVG-1374

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-14387 updated cvss 9.1

rsync: rsync-ssl does not verify the hostname in the server certificate when using openssl

  • Red Hat Enterprise Linux 5 rsync Red Hat Enterprise Linux 6 rsync Red Hat Enterprise Linux 7 rsync Red Hat Enterprise Linux 8 rsync, rsync-daemon
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.11% chance of exploitation in the next 30 days, higher than 66% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.4 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD 2.0 5.8 AV:N/AC:M/Au:N/C:P/I:P/A:N

Affected products

  • n/a rsync

Classification

Weakness
  • CWE-297 Improper Validation of Certificate with Host Mismatch

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.