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CVE-2022-42475

Fortinet FortiOS Heap-Based Buffer Overflow

9.8 CRITICALActively exploited (CISA KEV)Used in ransomwarePublic exploitEPSS 99.5%
  1. Published2 Jan 2023
  2. Added to CISA KEV13 Dec 2022
  3. Remediation due3 Jan 2023
Actively exploited (CISA KEV)

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

Added to KEV: 13 Dec 2022Federal remediation due: 3 Jan 2023Used in ransomware

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Fortinet FortiProxy≥ 1.0.0 ≤ 1.0.7 · ≥ 1.1.0 ≤ 1.1.6 · ≥ 1.2.0 ≤ 1.2.13 · ≥ 2.0.0 < 2.0.12
Fortinet FortiOS≥ 5.0.0 ≤ 5.0.14 · ≥ 5.2.0 ≤ 5.2.15 · ≥ 5.4.0 ≤ 5.4.13 · ≥ 5.6.0 ≤ 5.6.14

Remediation

Fixed in
Fortinet FortiProxy≥ 2.0.12
Fortinet FortiOS≥ 6.0.15

References

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Frequently asked

Is CVE-2022-42475 being actively exploited?

Yes. CVE-2022-42475 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 13 Dec 2022. It has been used in ransomware campaigns.

How severe is CVE-2022-42475?

CVE-2022-42475 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 99.5% probability of exploitation.

Which products are affected by CVE-2022-42475?

Affected products include Fortinet FortiProxy, Fortinet FortiOS.

How do I fix CVE-2022-42475?

Upgrade affected software to a fixed version, for example Fortinet FortiProxy 2.0.12, Fortinet FortiOS 6.0.15 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2022-42475 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.