Cyber Resilience

CVE-2026-59840

Memory Safety in Fortinet Fortiproxy 7.2.0 – 7.4.14

Memory Safety
Published
14 July 2026
Modified
16 July 2026
Patch / advisory
View advisory
CVSS Score v3.1 4.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
EPSS Score 0.0018 8th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-59840 is a medium-severity Buffer Over-read (CWE-126) vulnerability in Fortinet Fortiproxy. Its CVSS base score is 4.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

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…

more

all versions may allow attacker to information disclosure via <insert attack vector here>

CWE(s)
CWE-126

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
Why these techniques?

Buffer over-read in public-facing FortiOS/FortiProxy enables remote information disclosure via exploitation of the network appliance service.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2025-43892Same product: Fortinet Fortios
CVE-2024-55591Same product: Fortinet Fortios
CVE-2025-24472Same product: Fortinet Fortios
CVE-2024-26006Same product: Fortinet Fortios
CVE-2026-59837Same product: Fortinet Fortios
CVE-2026-59839Same product: Fortinet Fortios
CVE-2023-45586Same product: Fortinet Fortios
CVE-2023-29184Same product: Fortinet Fortios
CVE-2025-22862Same product: Fortinet Fortios
CVE-2023-33306Same product: Fortinet Fortios

Affected Assets

fortinet
fortiproxy
7.2.0 — 7.4.14 · 7.6.0 — 7.6.6
fortinet
fortios
7.2.0 — 7.4.9 · 7.6.0 — 7.6.2

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure development practices directly prevent introduction of buffer over-read weaknesses.

ID.RA-01 partial match
prevents

Vulnerability identification processes can discover buffer over-read flaws via scanning or review.

PR.PS-02 partial match
prevents

Patching or replacing vulnerable software removes known instances of buffer over-read bugs.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
detects

Security testing in development can detect buffer over-reads before release.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC mandates input validation and bounds checking that can prevent buffer over-reads.

A.8.26 Application security requirements partial match
prevents

Application security requirements can specify buffer-size and bounds-checking rules.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles include memory-safety and bounds-checking design choices.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly require bounds-checked buffer access, mitigating over-reads.

References