How severe is CVE-2020-14387?

CVE-2020-14387 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2020-14387 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-14387?

CVE-2020-14387 primarily affects Samba Rsync. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-14387?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2020-14387 published?

CVE-2020-14387 was published on 2021-05-27 and last updated on 2026-06-17.

CVE-2020-14387

CVE-2020-14387 is a high-severity vulnerability in Samba Rsync with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-297.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 5.8
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-297
Affected product: Samba Rsync
Published: 2021-05-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2020-14387?: 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.
How severe is CVE-2020-14387?: CVE-2020-14387 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2020-14387 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-14387?: CVE-2020-14387 primarily affects Samba Rsync. In total, 5 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-14387?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2020-14387 published?: CVE-2020-14387 was published on 2021-05-27 and last updated on 2026-06-17.

References

https://bugzilla.redhat.com/show_bug.cgi?id=1875549

Affected products (5)

cpe:2.3:a:samba:rsync:*:*:*:*:*:*:*:*
cpe:2.3:a:samba:rsync:3.2.0:-:*:*:*:*:*:*
cpe:2.3:a:samba:rsync:3.2.0:pre1:*:*:*:*:*:*
cpe:2.3:a:samba:rsync:3.2.0:pre2:*:*:*:*:*:*
cpe:2.3:a:samba:rsync:3.2.0:pre3:*:*:*:*:*:*

More vulnerabilities in Samba Rsync

CVE-2024-12084 — Critical (CVSS 9.8): A heap-based buffer overflow flaw was found in the rsync daemon. This issue is due to improper handling of…
CVE-2017-17434 — Critical (CVSS 9.8): The daemon in rsync 3.1.2, and 3.1.3-development before 2017-12-03, does not check for fnamecmp filenames in the…
CVE-2017-16548 — Critical (CVSS 9.8): The receive_xattr function in xattrs.c in rsync 3.1.2 and 3.1.3-development does not check for a trailing '\0'…
CVE-2017-15994 — Critical (CVSS 9.8): rsync 3.1.3-development before 2017-10-24 mishandles archaic checksums, which makes it easier for remote attackers to…
CVE-2026-43618 — High (CVSS 8.1): Rsync version 3.4.2 and prior contain an integer overflow vulnerability in the compressed-token decoder where a 32-bit…
CVE-2014-2855 — High (CVSS 7.8): The check_secret function in authenticate.c in rsync 3.1.0 and earlier allows remote attackers to cause a denial of…

All CVEs affecting Samba Rsync →

Other CWE-297 vulnerabilities

CVE-2025-46408 — Critical (CVSS 9.8): An issue was discovered in the methods push.lite.avtech.com.AvtechLib.GetHttpsResponse and…
CVE-2025-68637 — Critical (CVSS 9.1): The Uniffle HTTP client is configured to trust all SSL certificates and disables hostname verification by default.…
CVE-2026-35563 — High (CVSS 8.5): It was identified that the LDAP client implementation in version 2.1.7 does not verify if the server certificate…
CVE-2025-3501 — High (CVSS 8.2): A flaw was found in Keycloak. By setting a verification policy to 'ALL', the trust store certificate verification is…
CVE-2025-2190 — High (CVSS 8.1): The mobile application (com.transsnet.store) has a man-in-the-middle attack vulnerability, which may lead to code…
CVE-2018-10936 — High (CVSS 8.1): A weakness was found in postgresql-jdbc before version 42.2.5. It was possible to provide an SSL Factory and not check…

Browse all CWE-297 vulnerabilities →