CVE-2017-7494
Samba Remote Code Execution Vulnerability
Samba Samba
Samba since version 3.5.0 and before 4.6.4, 4.5.10 and 4.4.14 is vulnerable to remote code execution vulnerability, allowing a malicious client to upload a shared library to a writable share, and then cause the server to load and execute it.
Exploitation status
CISA Known Exploited Vulnerabilities
Listed by CISA on 30 March 2023. US federal agencies were required to remediate it by 20 April 2023. CISA records this vulnerability as known to be used in ransomware campaigns.
EPSS — exploitation probability
FIRST puts the probability of exploitation activity in the next 30 days at 99.4%, which is higher than 99.9% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Frequently asked questions
Is CVE-2017-7494 being exploited by ransomware groups?
No ransomware group in this database is currently recorded as exploiting CVE-2017-7494.
What does CVE-2017-7494 affect?
CVE-2017-7494 affects Samba Samba. Samba since version 3.5.0 and before 4.6.4, 4.5.10 and 4.4.14 is vulnerable to remote code execution vulnerability, allowing a malicious client to upload a shared library to a writable share, and then cause the server to load and execute it.
How severe is CVE-2017-7494?
CVE-2017-7494 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 99.4%, higher than 99.9% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 20 April 2023.
How should organisations respond to CVE-2017-7494?
Apply the vendor patch for Samba Samba as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.