CVE-2021-43205

Configuration disclosure via external-binary webserver access

Published Apr 6, 2022 · Updated Oct 22, 2024

Information disclosure in affected Fortinet FortiClient Linux releases allows remote attackers to access the confighandler webserver. Fortinet identifies external binaries as the access path but has not disclosed the request flow or failed authorization check that permits access. Affected releases are 7.0.2 and earlier in the 7.0 branch, 6.4.7 and earlier in 6.4, and 6.2.0 through 6.2.9; reachability is unauthenticated from an adjacent network, and the disclosed consequence is configuration exposure without reported modification or interruption.

CVSS severity4.3
Medium
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in affected Fortinet FortiClient Linux releases allows remote attackers to access the confighandler webserver. Fortinet identifies external binaries as the access path but has not disclosed the request flow or failed authorization check that permits access. Affected releases are 7.0.2 and earlier in the 7.0 branch, 6.4.7 and earlier in 6.4, and 6.2.0 through 6.2.9; reachability is unauthenticated from an adjacent network, and the disclosed consequence is configuration exposure without reported modification or interruption.

The record

CVE
CVE-2021-43205
Published
Apr 6, 2022
Updated
Oct 22, 2024
Vendor
Fortinet
Product
FortiClient Linux
Classifications
CWE-200
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 6, 2022CVE 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=FortiClientLinux 7.0.2 and below, 6.4.7 and below, 6.2.9 and below

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

Fortinet · FortiClient Linuxversion=FortiClientLinux 7.0.2 and below, 6.4.7 and below, 6.2.9 and below

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.3FortinetCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
4.2FortinetCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:X/RL:W/RC:C
5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/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)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor

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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