Critical severity · published Dec 1, 2025
CVE-2025-3500
Integer Overflow in Avast Antiviurs 25.1.981.6 on Windows may result in privilege escalation
9.8
CVSS
0.5%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 40% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AN
Antivirus · Avast
25.1.981.6 before 25.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-3500
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-3500
Not Applicable
https://www.gendigital.com/us/en/contact-us/security-advisories/
More from Antivirus
9.8
CVE-2020-10867
An issue was discovered in Avast Antivirus before 20
9.8
CVE-2017-8307
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…
8.8
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…
8.8
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 privileges by using system IPC…
8.8
CVE-2021-45335
Sandbox component in Avast Antivirus prior to 20.4 has an insecure permission which could be abused by local user to control the outcome of scans, and therefore evade detection or…