Home/CVE/An improper authentication vulnerability in FortiMail before 7.0.1 may allow a remote attacker to efficiently guess one
CVE

CVE-2021-36166

An improper authentication vulnerability in FortiMail before 7.0.1 may allow a remote attacker to efficiently guess one

An improper authentication vulnerability in FortiMail before 7.0.1 may allow a remote attacker to efficiently guess one administrative account's authentication token by means of the observation of certain system's properties.

CRITICAL · CVSS 9.8 EPSS 0.00503
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-330Use of Insufficiently Random Values
▤

Affected Products & Versions

5
fortinet fortimail<= 5.4.12
fortinet fortimail>= 6.0.0 and < 6.0.12
fortinet fortimail>= 6.2.0 and < 6.2.8
fortinet fortimail>= 6.4.0 and < 6.4.6
fortinet fortimailall versions
▣

Scoring & Timeline

9.8
CRITICAL · CVSS v3.1 · psirt@fortinet.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD01 Mar 2022 · 06:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://fortiguard.com/psirt/FG-IR-21-028Vendor Advisory
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