CVE-2025-3500 Integer Overflow in Avast Antiviurs 25.1.981.6 on Windows may result in privilege escalation
An integer overflow in Avast Antivirus allows attackers to escalate privileges on Windows systems.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2025-3500?
CVE-2025-3500 is a critical vulnerability in Avast Antivirus, published on 1 Dec 2025. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Integer Overflow or Wraparound vulnerability in Avast Antivirus (25.1.981.6) on Windows allows Privilege Escalation.This issue affects Antivirus: from 25.1.981.6 before 25.3.
Weakness: CWE-190
Which versions are affected by CVE-2025-3500?
It affects 1 product.
Products include Avast Antivirus.
How do I fix CVE-2025-3500?
No fix has been published for CVE-2025-3500 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-3500 being exploited?
There is no known exploitation of CVE-2025-3500 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Avast Antivirus
- CVE-2025-13032 Race condition in (Free/Inernet Security/Ultimate) Antivirus
- CVE-2020-10867 Security feature bypass in n/a
- CVE-2017-8307 Missing authorization in n/a
- CVE-2021-45335 Missing authorization in n/a
- CVE-2021-45336 Privilege escalation vulnerability in the Sandbox component of Avast Antivirus prior to 20.4 allows a local sandboxed code to gain elevated
Sources
Also known as GHSA-28rh-r6hp-jmq3.