CVE-2017-4949

VMware Workstation and Fusion contain a use-after-free vulnerability in VMware NAT service when IPv6 mode is enabled. This issue may allow a guest to execute code on the host. Note: IPv6 mode for VMNAT is not enabled by default.

Published: 2018-01-11 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-4949 is rated Low Risk (38.6/100): CVSS High severity, with low exploitation likelihood (EPSS 0.38%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-4949

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.07% 0.38% +0.31%
2 2023-03-07 1.36% 0.07% -1.30%
3 2022-02-04 — 1.36% —

Full EPSS history (4 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-4949

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.0 3.0 HIGH
CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.0 5.9 [email protected]
6.9 2.0 MEDIUM
AV:L/AC:M/Au:N/C:C/I:C/A:C Click to expand
Access vector (AV:L)
Requires local access to the target system.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:C)
Complete confidentiality impact.
Integrity impact (I:C)
Complete integrity impact.
Availability impact (A:C)
Complete availability impact.
 3.4 10.0 [email protected]

Weakness enumeration for CVE-2017-4949

Affected software / configurations for CVE-2017-4949

Vendor Product Version Raw CPE
vmware fusion >= 8.0, < 8.5.10 cpe:2.3:a:vmware:fusion:*:*:*:*:*:*:*:*
vmware fusion >= 10.0, < 10.1.1 cpe:2.3:a:vmware:fusion:*:*:*:*:*:*:*:*
vmware workstation >= 12.0, < 12.5.9 cpe:2.3:a:vmware:workstation:*:*:*:*:*:*:*:*
vmware workstation >= 14.0, < 14.1.1 cpe:2.3:a:vmware:workstation:*:*:*:*:*:*:*:*

References for CVE-2017-4949

URL Tags
http://www.securityfocus.com/bid/102489 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1040161 Third Party Advisory VDB Entry
https://www.vmware.com/security/advisories/VMSA-2018-0005.html Patch Vendor Advisory
cvelogic Threat Intelligence