CVE-2015-8620

Heap-based buffer overflow in the Avast virtualization driver (aswSnx.sys) in Avast Internet...

7.8 High

Heap-based buffer overflow in the Avast virtualization driver (aswSnx.sys) in Avast Internet Security, Pro Antivirus, Premier, and Free Antivirus before 11.1.2253 allows local users to gain privileges via a Unicode file path in an IOCTL request.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.50%Down 0.4 points since Feb 4, 2022

What each source reports

NVD Score used 7.8

Record: CVE-2015-8620
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.2 HighAV:L/AC:L/Au:N/C:C/I:C/A:C
Weakness: CWE-119
Updated: 2026-11-02

CVE List No score

Record: CVE-2015-8620
Updated: 2026-11-02

EUVDEUVD-2015-8497 No score

Record: EUVD-2015-8497
Updated: 2026-11-03

GitHub AdvisoriesGHSA-h59g-9hw8-qw3x 7.8

Heap-based buffer overflow in the Avast virtualization driver (aswSnx.sys) in Avast Internet...

Record: GHSA-h59g-9hw8-qw3x
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-119
Updated: 2026-11-02

Affected products

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2015-8620 is a high vulnerability (CVSS 7.8) in Avast Free Antivirus, published April 13, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.50%, the 43rd percentile. No source names a fixed version.