Vulnerability · CVE-2025-3500
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.
Published Dec 1, 2025 · catalog updated Feb 26, 2026 · Avast Antivirus
Last checked Nov 1, 2026. A connected source was read within the last 7 days.
Check if you run it
No confirmed exploitation is on record for CVE-2025-3500. EPSS is 0.48%. Act only if a listed version of Avast Antivirus is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- Critical9.0
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 0.48%
- Remediation
- Version ranges on file
- Affected products
- vendor Avast Antivirus 25.1.981.6 <25.3
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Avast Antivirus 25.1.981.6 <25.325.1.981.6 <25.3
How to fix CVE-2025-3500
Upgrade
CVE-2025-3500 lists a fix boundary at 25.3. Compare the installed build with that boundary before you change production.
Version check
Seen in 25.1.981.6 <25.3
Advisory
Open the cve_org record and follow its fix.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2025-3500. EPSS is 0.48%. Act only if a listed version of Avast Antivirus is installed.
Which versions are affected?
Compare what you have installed with Avast Antivirus 25.1.981.6 <25.3 25.1.981.6 <25.3. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 0.48%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Dec 1, 2025 · EUVD
Detected
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.
Feb 26, 2026 · EUVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2025-3500
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2025-3500
30-day exploitation probability 0.48%
first.org - EUVDVulnerability recordEUVD-2025-200018
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.
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Nov 1, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.
- FIRST EPSSNov 1, 2026
- CVE.orgOct 27, 2026
- EUVDOct 26, 2026