CVE-2017-7494: Samba Remote Code Execution Vulnerability

Is it exploited?

Yes. CISA added it to the Known Exploited Vulnerabilities catalog on 30 Mar 2023, 2,130 days after the CVE record was published.

How likely is exploitation in the next 30 days?

99.4%

EPSS score, percentile 99.9 of all scored records

How severe?

9.8 Critical

CVSS v3.1 base score, from CISA's enrichment of the record

What should I do?

Required action (CISA), due 20 Apr 2023: Apply updates per vendor instructions.

Advisories and patches (7)

Which versions are affected?

Affected: since 3.5.0

Versions by product

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

What to do

CISA due date for this action: 20 April 2023.

Advisories and patches

• DSA-3860 (Vendor advisory)
• RHSA-2017:1270 (Vendor advisory)
• RHSA-2017:1390 (Vendor advisory)
• RHSA-2017:1273 (Vendor advisory)
• RHSA-2017:1271 (Vendor advisory)
• GLSA-201805-07 (Vendor advisory)
• RHSA-2017:1272 (Vendor advisory)

Linked from CISA's catalog entry

• https://www.samba.org/samba/security/CVE-2017-7494.html
• https://nvd.nist.gov/vuln/detail/CVE-2017-7494

Affected products and versions

As listed in the CVE record.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

About this vulnerability

Samba contains a 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.

Summary: CISA's KEV catalog, as of 28 Oct 2026.

• CISA added CVE-2017-7494 to its Known Exploited Vulnerabilities (KEV) catalog on 30 Mar 2023.
• CISA marks it as known to be used in ransomware campaigns.
• The due date CISA sets for the required action is 20 Apr 2023.
• The CVE record was published on 30 May 2017, 2,130 days before it was added to KEV.
• The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), taken from CISA's enrichment of the record.
• FIRST's EPSS model puts the probability of exploitation in the next 30 days at 99.4% (percentile 99.9), as of 28 Oct 2026.
• CISA's SSVC assessment in the CVE record: exploitation active, automatable yes, technical impact total.

Source: CISA Known Exploited Vulnerabilities (KEV) catalog, 2026.10.28, as of 28 Oct 2026; CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026; FIRST Exploit Prediction Scoring System (EPSS), v2026.06.15, as of 28 Oct 2026. About the data.

Description

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.

Source: CVE List V5 (CVE Program), cve_2026-10-28_0000Z, as of 28 Oct 2026. About the data.

Weakness

• CWE-94: Improper Control of Generation of Code ('Code Injection')

CWE and CAPEC are maintained by MITRE; the entries are those named in the CVE record and the KEV entry.

Timeline

References

• 42084 (Exploit)
• 42060 (Exploit)
• 98636 (Vulnerability database)
• 1038552 (Vulnerability database)
• samba.org

4 more in the CVE record.