Heap-based buffer overflow in the Avast virtualization driver (aswSnx.sys) in Avast…
Priority LOW 35CWE-119Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
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.
Why it matters now
EPSS 0.00503 43rd percentileScored 2026-11-07
Public exploit Yes 3 exploit referencesTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:avast:avast_free_antivirus:*:*:*:*:*:*:*:* | up to 11.1.2245 | Vulnerable | Avast |
| cpe:2.3:a:avast:avast_internet_security:*:*:*:*:*:*:*:* | up to 11.1.2245 | Vulnerable | Avast |
| cpe:2.3:a:avast:avast_premier:*:*:*:*:*:*:*:* | up to 11.1.2245 | Vulnerable | Avast |
| cpe:2.3:a:avast:avast_pro_antivirus:*:*:*:*:*:*:*:* | up to 11.1.2245 | Vulnerable | Avast |
- cpe:2.3:a:avast:avast_free_antivirus:*:*:*:*:*:*:*:* Versions up to 11.1.2245 Vulnerable ·Avast
- cpe:2.3:a:avast:avast_internet_security:*:*:*:*:*:*:*:* Versions up to 11.1.2245 Vulnerable ·Avast
- cpe:2.3:a:avast:avast_premier:*:*:*:*:*:*:*:* Versions up to 11.1.2245 Vulnerable ·Avast
- cpe:2.3:a:avast:avast_pro_antivirus:*:*:*:*:*:*:*:* Versions up to 11.1.2245 Vulnerable ·Avast
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2015-8620
- 2026-10-03 Alias added: GHSA-h59g-9hw8-qw3x
References
Sources
- CVE-2015-8620 · CVE Program
- CVE-2015-8620 · NVD
- FIRST EPSS
- GHSA-h59g-9hw8-qw3x · GitHub Advisory Database · CC BY 4.0
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