CVE-2021-26107Network attack vector

Cross-VDOM tunnel modification via missing authorization

Published Nov 2, 2021 · Updated Oct 25, 2024

Improper access control in Fortinet FortiManager 6.4.4 and 6.4.5 allows remote authenticated users to modify other VDOMs' VPN tunnels. VPN Manager fails to confine a restricted administrator's tunnel-status operations to that account's authorized VDOMs. A restricted profile with VPN Manager access can change tunnel state outside its assigned domains, disrupting or restoring cross-VDOM connectivity.

CVSS severity6.3
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Fortinet FortiManager 6.4.4 and 6.4.5 allows remote authenticated users to modify other VDOMs' VPN tunnels. VPN Manager fails to confine a restricted administrator's tunnel-status operations to that account's authorized VDOMs. A restricted profile with VPN Manager access can change tunnel state outside its assigned domains, disrupting or restoring cross-VDOM connectivity.

The record

CVE
CVE-2021-26107
Published
Nov 2, 2021
Updated
Oct 25, 2024
Vendor
Fortinet
Product
FortiManager
Classifications
CWE-284
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Oct 25, 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=FortiManager 6.4.5, 6.4.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Fortinet · FortiManagerversion=FortiManager 6.4.5, 6.4.4

Published CVSS scores

6.3NISTCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.2FortinetCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:H/RL:W/RC:C

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control

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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