What is CVE-2017-7494?

CVE-2017-7494 is a critical-severity vulnerability in Samba, classified under Code Injection. CVSS score: 9.8/10. Published 2017-05-30.

How severe is CVE-2017-7494?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2017-7494 known to be exploited?

Yes. CVE-2017-7494 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-03-30), indicating it is being actively exploited. 332 public proof-of-concept repositories are indexed.

RCE in Samba

CVE-2017-7494

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.

Vulnerability class: RCE (Remote Code Execution)

Published 2017-05-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.994 (99.9th percentile), scored 2026-10-18.

Very high probability of exploitation in the next 30 days — among the top 0.1% most-likely-to-be-exploited CVEs. 100th percentile — 99.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.994 · newest: 0.994 · change: 0.000

Affected products

Samba — versions since 3.5.0
Debian Linux — versions 8.0

Weakness classification (CWE)

CWE-94 — Code Injection

CISA KEV (Known Exploited Vulnerabilities)

This CVE is on the CISA KEV catalog, added on 2023-03-30. CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.

BOD 22-01 due date: 2023-04-20.

Required action: Apply updates per vendor instructions.

Known ransomware campaign use: yes.

Public proof-of-concept exploits

References

www.securityfocus.com/bid/98636 (VDB Entry, Third Party Advisory, vdb-entry)
www.debian.org/security/2017/dsa-3860 (vendor-advisory, Third Party Advisory)
www.exploit-db.com/exploits/42084/ (VDB Entry, Third Party Advisory, exploit)
access.redhat.com/errata/RHSA-2017:1270 (vendor-advisory, Third Party Advisory)
www.samba.org/samba/security/CVE-2017-7494.html (Patch, Vendor Advisory)
download.schneider-electric.com/files (Third Party Advisory)
access.redhat.com/errata/RHSA-2017:1390 (vendor-advisory, Third Party Advisory)
www.securitytracker.com/id/1038552 (VDB Entry, Third Party Advisory, vdb-entry)
access.redhat.com/errata/RHSA-2017:1273 (vendor-advisory, Third Party Advisory)
access.redhat.com/errata/RHSA-2017:1271 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2017-7494?: CVE-2017-7494 is a critical-severity vulnerability in Samba, classified under Code Injection. CVSS score: 9.8/10. Published 2017-05-30.
How severe is CVE-2017-7494?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2017-7494 known to be exploited?: Yes. CVE-2017-7494 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2023-03-30), indicating it is being actively exploited. 332 public proof-of-concept repositories are indexed.