CVE-2022-42475

A heap-based buffer overflow vulnerability [CWE-122] in FortiOS SSL-VPN 7.2.0 through 7.2.2, 7.0.0 through 7.0.8, 6.4.0 through 6.4.10, 6.2.0 through 6.2.11, 6.0.15 and earlier and FortiProxy SSL-VPN 7.2.0 through 7.2.1, 7.0.7 and earlier may allow a remote unauthenticated attacker to execute arbitrary code or commands via specifically crafted requests.

Exploited in the wild: Yesadded 2022-12-13 · due 2023-01-03 · known ransomware use. An observation, not a forecast.
EPSS · 30-day forecast: 99%Chance of exploitation in the next 30 days, 100th percentile of all CVEs. A forecast; KEV outranks it.
CVSS · NVD · CRITICAL: 9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Internet exposure: not stated by sourcesNo exposure census on this CVE's dispatches.

Exploits

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On the wire

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Cited as exploited by

Volt Typhoon
1. “In one confirmed compromise, Volt Typhoon actors likely obtained initial access by exploiting CVE-2022-42475 in a network perimeter FortiGate 300D firewall that was not patched.”
  cited as exploiting · source: cisa.gov ↗ · 2026-10-17
CosmicBeetle
1. “CVE-2022-42475 (a vulnerability in FortiOS SSL-VPN), and”
  cited as exploiting · named nearby · source: welivesecurity.com ↗ · 2026-10-17
UNC3886
1. “UNC3886 has exploited CVE-2022-42475 in FortiOS SSL VPNs to obtain access.”
  cited as exploiting · source: attack.mitre.org ↗ · 2026-10-17

Each actor is cited by the quoted source, linked under the quote. A citation is that source's claim, not our confirmation.

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