Legitimate Files Incorrectly Flagged as Malicious When Scanned with ICAP

Product: Anti-Virus
Version: R81.20, R82, R82.10
Last Modified: 2026-07-23

Symptoms

• When using Internet Content Adaptation Protocol (ICAP) to scan files, the Anti‑Virus Blade flags multiple legitimate vendor files as malicious with the message VIRUS FOUND.
• Large files may cause ICAP to fail open or closed.
• Scans of password‑protected or encrypted ZIP files behave inconsistently.

Cause

A change introduced in R81.20 Jumbo Hotfix Accumulator Take 113 modified ICAP error‑handling logic.

In specific scan‑error conditions, ICAP incorrectly classified the file as malicious instead of reporting a scan error, resulting in false detections.

Solution

This problem was fixed. The fix is included in:

• Jumbo Hotfix Accumulator for R82.10 starting from Take 19
• Jumbo Hotfix Accumulator for R82 starting from Take 103
• Jumbo Hotfix Accumulator for R81.20 starting from Take 158

If you choose not to upgrade, Check Point can supply a Hotfix. Contact Check Point Support to get a Hotfix for this issue.

A Support Engineer will make sure the Hotfix is compatible with your environment before providing the Hotfix.

For faster resolution and verification, please collect CPinfo files from the Security Management Server and Security Gateways involved in the case.

Hotfix installation instructions:

Refer to sk168597 - How to install a Hotfix.

NOTE

This solution has been verified for the specific scenario, described by the combination of Product, Version and Symptoms. It may not work in other scenarios.

Article Properties

Access Level: General Status: Approved by TAC
Date Created: 2026-02-03
Last Modified: 2026-07-23