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CVE-2023-27997

Fortinet · FortiOS and FortiProxy SSL-VPN · Fortinet FortiOS and FortiProxy SSL-VPN Heap-Based Buffer Overflow Vulnerability

· Added to CISA KEV
CVSS—
Severityhigh
Weakness—
ExploitedYes, in CISA KEV
Ransomware useKnown
Federal fix dueJul 4, 2023

Description

Fortinet FortiOS and FortiProxy SSL-VPN contain a heap-based buffer overflow vulnerability which can allow an unauthenticated, remote attacker to execute code or commands via specifically crafted requests.

Required action (CISA)

Apply updates per vendor instructions.

References

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Our coverage of CVE-2023-27997

CVE-2026-24858high

FortiBleed: Credential Reuse, Legacy Hashes, and the Risk of Internet-Exposed FortiGate Devices

A widespread issue dubbed FortiBleed has been reported, involving the large-scale exposure and abuse of credentials targeting internet-facing FortiGate devices. This problem stems from credential reuse and brute-force attacks, rather than a new vulnerability. The risk is particularly high for devices lacking multi-factor authentication or those with previously compromised credentials.