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01 Record

CVE-2025-3500

Integer Overflow in Avast Antiviurs 25.1.981.6 on Windows may result in privilege escalation

CriticalPUBLISHEDCNA: NLOK
CNA base score9.0 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

02 Description

Integer Overflow in Avast Antiviurs 25.1.981.6 on Windows may result in privilege escalation

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.45% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 39.4% of scored records. A rank, not a probability.
NVD base score
9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Analyzed. NVD last modified this record on 2026-09-26.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2025-12-01 16:09Z11 MO AGO
Last updated
2026-02-26 16:57Z8 MO AGO
Reserved
2025-04-10
Assigning CNA
NLOK
Record state
PUBLISHED
Severity
Critical (CVSS 9.0)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H
Weaknesses
  • CWE-190Integer Overflow or WraparoundBase
Data version
5.2
Document digest
7d5daed6119dd87dd8296aef622407efd7bdaa106900053532a2ff8297c64b63

05 Affected products

VendorProductVersionsPlatforms
AvastAntivirus25.1.981.6 to < 25.3Windows

06 References

07 Remediation

Upgrade to version 25.3 (or newer) released 01/APR/2025