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    CVE-2021-45337

    Privilege escalation vulnerability in the Self-Defense driver of Avast Antivirus prior to 20.8 allows a local user with SYSTEM privileges to gain elevated privileges by "hollowing" process wsc_proxy.exe which could lead to acquire antimalware (AM-PPL) protection.

    Published:Dec 27, 2021
    Last Modified:Nov 21, 2024
    EPS:Dec 27, 2021
    EPSS Score:0.00074
    CVSS Score:8.8

    Affected Products

    Vendor
    Avast
    Product
    Antivirus

    Exploits

    https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST3%20%26%20CVE-2021-AVST4%20%26%20CVE-2021-AVST5https://github.com/the-deniss/Vulnerability-Disclosures/tree/main/CVE-2021-AVST3%20%26%20CVE-2021-AVST4%20%26%20CVE-2021-AVST5

    Common Weakness Enumeration

    No CWE recorded yet

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

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    CVE-2025-8351 (CVSS 7.8) — Heap-based Buffer Overflow, Out-of-bounds Read vulnerability in Avira Antivirus engine when scanning a malform…
    CVE-2025-10101 (CVSS 7.8) — Heap buffer out-of-bounds read vulnerability in Avast Antivirus when scanning a malformed Mach-O file may allo…
    CVE-2025-13032 (CVSS 9.9) — Double fetch in sandbox kernel driver in Avast/AVG Antivirus <25.3  on windows allows local attacker to escala…
    CVE-2024-9484 (CVSS 5.1) — An null-pointer-derefrence in the engine module in AVG/Avast Antivirus signature <24092400 released on 24/Sep/…
    CVE-2024-9483 (CVSS 5.1) — A null-pointer-dereference in the signature verification module in AVG/Avast Antivirus signature <24092400 rel…
    CVE-2024-9482 (CVSS 5.1) — An out-of-bounds write in the engine module in AVG/Avast Antivirus signature <24092400 released on 24/Sep/2024…
    CVE-2024-9481 (CVSS 5.1) — An out-of-bounds write in the engine module in AVG/Avast Antivirus signature <24092400 released on 24/Sep/2024…
    CVE-2024-5102 (CVSS 7.3) — A sym-linked file accessed via the repair function in Avast Antivirus <24.2 on Windows may allow user to eleva…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High