PT-2026-40109 · Fortinet · Fortios

Published 2026-05-12 · Updated 2026-05-15 · CVE-2025-53844

Positive Technologies (AI Summary)

CVSS v2.0

9.0

High

Base vector

AV:N/AC:L/Au:S/C:C/I:C/A:C

Name of the Vulnerable Software and Affected Versions FortiOS versions 7.6.0 through 7.6.3 FortiOS versions 7.4.0 through 7.4.8 FortiOS versions 7.2.0 through 7.2.11

Description An out-of-bounds write issue allows an attacker to execute unauthorized code or commands by sending specially crafted packets. An out-of-bounds write occurs when a program writes data past the end of an intended buffer, which can lead to memory corruption.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Memory Corruption

Weakness Enumeration

CWE-787

Related Identifiers

BDU:2026-06783

CVE-2025-53844

Affected Products

Fortios

References · 7

• https://fortiguard.fortinet.com/psirt/FG-IR-26-123 · Vendor Advisory
• https://bdu.fstec.ru/vul/2026-06783 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-53844 · Security Note
• https://t.me/cveNotify/163623 · Telegram Post
• https://cert-portal.siemens.com/productcert/html/ssa-864900.html · Note
• https://twitter.com/KaitanSecurity/status/2054343390867718332 · Twitter Post
• https://twitter.com/CCBalert/status/2054823139465474249 · Twitter Post