What’s Vulnerable › Vulnerabilities

CVE-2019-14907

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-01-21 · updated 2026-06-17
• Weakness: CWE-125

Description

All samba versions 4.9.x before 4.9.18, 4.10.x before 4.10.12 and 4.11.x before 4.11.5 have an issue where if it is set with "log level = 3" (or above) then the string obtained from the client, after a failed character conversion, is printed. Such strings can be provided during the NTLMSSP authentication exchange. In the Samba AD DC in particular, this may cause a long-lived process(such as the RPC server) to terminate. (In the file server case, the most likely target, smbd, operates as process-per-client and so a crash there is harmless).

Affected products

• Canonical Ubuntu Linux: 16.04, 18.04, 19.04, 19.10
• Debian Linux: 9.0
• Fedoraproject Fedora: 30, 31
• Red Hat Enterprise Linux: 7.0, 8.0
• RedHat Storage: 3.0
• Samba: from 4.9.0 before 4.9.18; from 4.10.0 before 4.10.12; from 4.11.0 before 4.11.5 — fixed in 4.10.12, 4.11.5, 4.9.18
• Synology Directory Server: all versions
• Synology DiskStation Manager: 6.2
• Synology Router Manager (SRM): 1.2
• Synology Skynas: all versions

How to fix

Upgrade to a fixed version: Samba 4.10.12, 4.11.5, 4.9.18. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00055.html
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-14907
• https://lists.debian.org/debian-lts-announce/2021/05/msg00023.html
• https://lists.debian.org/debian-lts-announce/2023/09/msg00013.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4ACZVNMIFQGGXNJPMHAVBN3H2U65FXQY/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GQ6U65I2K23YJC4FESW477WL55TU3PPT/
• https://security.gentoo.org/glsa/202003-52
• https://security.netapp.com/advisory/ntap-20200122-0001/
• https://usn.ubuntu.com/4244-1/
• https://www.samba.org/samba/security/CVE-2019-14907.html
• https://www.synology.com/security/advisory/Synology_SA_20_01
• http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00055.html

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