CVE-2026-59840: Information disclosure in Fortinet FortiOS
A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions, FortiProxy 7.6.0 through 7.6.5, FortiProxy 7.4.0 through 7.4.13, FortiProxy 7.2 all versions, FortiProxy 7.0 all versions may allow attacker to information disclosure via <insert attack vector here>
AI Analysis
Technical Summary
This vulnerability involves a buffer over-read in Fortinet FortiOS versions 6.4 all versions, 7.0 all versions, 7.2 all versions, 7.4.0 through 7.4.8, and 7.6.0 through 7.6.3, as well as FortiProxy versions 7.0 all versions, 7.2 all versions, 7.4.0 through 7.4.13, and 7.6.0 through 7.6.5. The flaw may allow an attacker to disclose information due to improper handling of buffer boundaries. The CVSS v3.1 base score is 4.1 (medium), with network attack vector, low attack complexity, low privileges required, no user interaction, and partial confidentiality impact. The vulnerability has an official fix available from the vendor.
Potential Impact
Successful exploitation could lead to unauthorized disclosure of information, potentially exposing sensitive data. There is no indication of integrity or availability impact. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Fortinet. Users should apply the vendor-provided patches to affected FortiOS and FortiProxy versions to remediate this vulnerability. Since the vendor has released an official fix, applying the patch is the recommended mitigation.
CVE-2026-59840: Information disclosure in Fortinet FortiOS
Description
A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions, FortiProxy 7.6.0 through 7.6.5, FortiProxy 7.4.0 through 7.4.13, FortiProxy 7.2 all versions, FortiProxy 7.0 all versions may allow attacker to information disclosure via <insert attack vector here>
CVSS v3.1
Score 4.1medium
Affected software
cpe:2.3:a:fortinet:fortiswitchmanager:7.2.7:*:*:*:*:*:*:*cpe:2.3:a:fortinet:fortiswitchmanager:7.2.6:*:*:*:*:*:*:*cpe:2.3:a:fortinet:fortiswitchmanager:7.2.5:*:*:*:*:*:*:*cpe:2.3:a:fortinet:fortiswitchmanager:7.2.4:*:*:*:*:*:*:*cpe:2.3:a:fortinet:fortiswitchmanager:7.2.3:*:*:*:*:*:*:*cpe:2.3:a:fortinet:fortiswitchmanager:7.2.2:*:*:*:*:*:*:*AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability involves a buffer over-read in Fortinet FortiOS versions 6.4 all versions, 7.0 all versions, 7.2 all versions, 7.4.0 through 7.4.8, and 7.6.0 through 7.6.3, as well as FortiProxy versions 7.0 all versions, 7.2 all versions, 7.4.0 through 7.4.13, and 7.6.0 through 7.6.5. The flaw may allow an attacker to disclose information due to improper handling of buffer boundaries. The CVSS v3.1 base score is 4.1 (medium), with network attack vector, low attack complexity, low privileges required, no user interaction, and partial confidentiality impact. The vulnerability has an official fix available from the vendor.
Potential Impact
Successful exploitation could lead to unauthorized disclosure of information, potentially exposing sensitive data. There is no indication of integrity or availability impact. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Fortinet. Users should apply the vendor-provided patches to affected FortiOS and FortiProxy versions to remediate this vulnerability. Since the vendor has released an official fix, applying the patch is the recommended mitigation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- fortinet
- Date Reserved
- 2026-07-07T15:21:36.593Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
Threat ID: 6a565a3d68715ace43c7b74e
Added to database: 07/14/2026, 15:48:13 UTC
Last enriched: 08/11/2026, 13:19:43 UTC
Last updated: 08/28/2026, 04:35:03 UTC
Views: 147
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