CVE-2020-9295 — FortiOS 6.2 running AV engine version 6.00142 and below, FortiOS 6.4 running AV engine version 6.00144 and be…

Summary

FortiOS 6.2 running AV engine version 6.00142 and below, FortiOS 6.4 running AV engine version 6.00144 and below and FortiClient 6.2 running AV engine version 6.00137 and below may not immediately detect certain types of malformed or non-standard RAR archives, potentially containing malicious files. Based on the samples provided, FortiClient will detect the malicious files upon trying extraction by real-time scanning and FortiGate will detect the malicious archive if Virus Outbreak Prevention is enabled.

Weakness: CWE-358

Title, description and the vendor's statements are quoted from the CVE record; a vendor's advisory is summarised in Patcharo's words, with a link.

Affected and fixed versions

Per product and release branch, as the vendor's CVE record and official advisory state them. A fixed release is shown only when a document names it: the vendor's, or CERT-FR's for Check Point, with its source.

Remediation

Known exploitation

Not listed in CISA KEV as of the last check.

0.32% probability of exploitation in the next 30 days (percentile 22%).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CERT-FR

No CERT-FR advisory or alert of the last two years references this CVE, for the vendors Patcharo covers.

Timeline

1. 17 Mar 2025Published by the source
2. 17 Jun 2026Source record last modified
3. 29 Sept 2026EPSS score computed
4. 1 Oct 2026Last verified by Patcharo

Official sources

• Fortinet (CVE record)retrieved 1 Oct 2026 at 09:30 UTC
• NVDretrieved 27 Sept 2026 at 23:44 UTC
• FIRST EPSSretrieved 30 Sept 2026 at 00:17 UTC
• FortiGuard FG-IR-20-037retrieved 1 Oct 2026 at 09:30 UTC

Fortinet · NVD · FIRST EPSS · FortiGuard FG-IR-20-037