CVE-2022-39948Network attack vector

Man-in-the-middle feed tampering via missing certificate validation

Published Feb 16, 2023 · Updated Oct 22, 2024

Improper certificate validation in Fortinet FortiOS and FortiProxy allows remote attackers to intercept configured HTTPS threat feeds. The Fabric connector accepts a threat-feed server certificate without properly validating it, enabling an on-path server impersonation. Exploitation requires a configured remote threat feed and an on-path network position; attackers can read or alter feed content in transit.

CVSS severity4.8
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper certificate validation in Fortinet FortiOS and FortiProxy allows remote attackers to intercept configured HTTPS threat feeds. The Fabric connector accepts a threat-feed server certificate without properly validating it, enabling an on-path server impersonation. Exploitation requires a configured remote threat feed and an on-path network position; attackers can read or alter feed content in transit.

The record

CVE
CVE-2022-39948
Published
Feb 16, 2023
Updated
Oct 22, 2024
Vendor
Fortinet
Product
FortiOS
Classifications
CWE-295, T1557
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 16, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.0.0 <=6.0.16
  2. Affected versionversion=6.2.0 <=6.2.12
  3. Affected versionversion=6.4.0 <=6.4.11
  4. Affected versionversion=7.0.0 <=7.0.7
  5. Affected versionversion=7.2.0 <=7.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Fortinet · FortiOSversion=6.0.0 <=6.0.16; version=6.2.0 <=6.2.12; version=6.4.0 <=6.4.11; version=7.0.0 <=7.0.7; version=7.2.0 <=7.2.3
Fortinet · FortiProxyversion=1.2.0 <=1.2.13; version=2.0.0 <=2.0.11; version=7.0.0 <=7.0.6

Published CVSS scores

4.8Fortinet, Inc.CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
7.4NIST NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-295Improper Certificate Validation
T1557Adversary-in-the-Middle

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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