What’s Vulnerable › Vulnerabilities

CVE-2019-12436

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-06-19 · updated 2026-06-17
• Weakness: CWE-476

Description

Samba 4.10.x before 4.10.5 has a NULL pointer dereference, leading to an AD DC LDAP server Denial of Service. This is related to an attacker using the paged search control. The attacker must have directory read access in order to attempt an exploit.

Affected products

• Canonical Ubuntu Linux: 19.04
• Samba: from 4.10.0 before 4.10.5 — fixed in 4.10.5

How to fix

Upgrade to a fixed version: Samba 4.10.5. Check the vendor advisory for mitigations.

References

• http://www.securityfocus.com/bid/108823
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQ3LCJNJ3ONHIRKDSKOTT6QGXALLCHVG/
• https://usn.ubuntu.com/4018-1/
• https://www.samba.org/samba/security/CVE-2019-12436.html
• https://www.synology.com/security/advisory/Synology_SA_19_27
• http://www.securityfocus.com/bid/108823
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZQ3LCJNJ3ONHIRKDSKOTT6QGXALLCHVG/
• https://usn.ubuntu.com/4018-1/
• https://www.samba.org/samba/security/CVE-2019-12436.html
• https://www.synology.com/security/advisory/Synology_SA_19_27

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