What’s Vulnerable › Vulnerabilities

CVE-2020-20118

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-07-11 · updated 2026-07-09
• Weakness: CWE-120

Description

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.

Affected products

• Avast Antivirus: before 19.7 — fixed in 19.7

How to fix

Upgrade to a fixed version: Avast Antivirus 19.7. Check the vendor advisory for mitigations.

References

• https://gitlab.com/yongchuank/avast-aswsnx-ioctl-82ac0060-oob-write
• https://gitlab.com/yongchuank/avast-aswsnx-ioctl-82ac0060-oob-write

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