CVE-2020-14387 Security feature bypass in rsync
Attackers can bypass TLS host validation in rsync-ssl via man-in-the-middle attacks, compromising data confidentiality and integrity.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2020-14387?
CVE-2020-14387 is a high-severity vulnerability in rsync, published on 27 May 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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. This flaw affects rsync versions before 3.2.4.
Weakness: CWE-297
Which versions are affected by CVE-2020-14387?
It affects 1 product.
Products include Samba Rsync.
How do I fix CVE-2020-14387?
Upgrade to a fixed version.
Is CVE-2020-14387 being exploited?
There is no known exploitation of CVE-2020-14387 in the wild and no public exploit code.
Other vulnerabilities in rsync
- CVE-2017-15994 Security feature bypass in n/a
- CVE-2026-53791 rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header
- CVE-2026-70461 rsync 3.2.5 < 3.5.0 Heap Out-of-Bounds Write via files-from Entry
- CVE-2026-70455 rsync 3.4.2 < 3.5.0 DoS via --zt Zstandard Compression Thread Exhaustion
- CVE-2026-70463 rsync 3.1.0 < 3.5.0 Authorization Bypass via auth users Directive Parsing
Sources
Also known as ALPINE-CVE-2020-14387, AZL-7462, DEBIAN-CVE-2020-14387, GHSA-5gm2-c485-9q6q.