CVE-2026-80303
MEDIUM
MEDIUM
Priority: 0.01
BB Relevance:
47/100
Published: 2026-11-06
Modified: 2026-11-12
First seen: 2026-11-06
Status: active
Attack Surface
Low Complexity
No Auth
No Interaction
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
None
UI:
None
S:
Unchanged
C:
None
I:
None
A:
High
Description
An integer underflow vulnerability in the Avast Windows Filtering Platform (WFP) stream parser on Windows allows denial of service by causing a system crash.
The WFP callout driver processes network stream data and computes length values for packet fragment reassembly. The length calculation does not properly validate input stream sizes against expected boundaries. When processing specially crafted input, the length computation underflows, resulting in allocation or buffer access with an extremely large wrapped-around size value.
The underflow can be triggered remotely via network traffic destined for the filtered port, or locally via crafted data provided to the filtering interface. The resulting memory allocation failure or out-of-bounds access causes a kernel panic and system crash.
Weakness Classification (2)
Affected Software (6)
| Vendor | Product | Version |
|---|
| Gen Digital |
AVG Antivirus Free, AVG Internet Security, AVG Ultimate |
0
< 26.7
|
| Gen Digital |
AVG Antivirus Free, AVG Internet Security, AVG Ultimate |
0
< 26.7
|
| Gen Digital |
Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate |
0
< 26.7
|
| Gen Digital |
Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate |
0
< 26.7
|
| Gen Digital |
Norton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 Advanced |
0
< 26.7
|
| Gen Digital |
Norton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 Advanced |
0
< 26.7
|
References & Advisories (4)