CVE-2020-20118
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
A buffer overflow vulnerability in the aswSnx.sys driver of Avast AntiVirus before version 19.7 allows a local attacker to cause a denial of service (DoS) via a crafted request.
Risk Assessment
A local attacker can crash the system or the antivirus service, leading to disruption of protection and potential exposure to other threats.
Recommendation
It is recommended to immediately update Avast AntiVirus to version 19.7 or later, which includes a fix for this vulnerability.
Other vulnerabilities in Avast AntiVirus
See all- CVE-2026-82964High
Avast's sandbox minifilter driver (aswSnx.sys) on Windows has an improper preservation of permissions vulnerability, allowing a local, low-privileged attacker in the sandbox to escape file isolation and escalate to SYSTEM.
- CVE-2017-8308High
In Avast Antivirus before v17, an unprivileged user can mark an arbitrary process as Trusted from the perspective of the Avast product. This bypasses the Self-Defense feature of the product, opening a door to subsequent attack on many of its components.
- CVE-2017-8307Critical
In Avast Antivirus before v17, using the LPC interface API exposed by the AvastSVC.exe Windows service, it is possible to launch predefined binaries, or replace or delete arbitrary files. This vulnerability is exploitable by any unprivileged user when Avast Self-Defense is disabled.
Original NVD description (English source)
Buffer Overflow vulnerability in Avast AntiVirus before v.19.7 allows a local attacker to cause a denial of service via a crafted request to the aswSnx.sys driver.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS