Home/CVE/An insufficient verification of data authenticity vulnerability (CWE-345) in the user interface of FortiProxy verison 2.
CVE

CVE-2021-26103

An insufficient verification of data authenticity vulnerability (CWE-345) in the user interface of FortiProxy verison 2.

An insufficient verification of data authenticity vulnerability (CWE-345) in the user interface of FortiProxy verison 2.0.3 and below, 1.2.11 and below and FortiGate verison 7.0.0, 6.4.6 and below, 6.2.9 and below of SSL VPN portal may allow a remote, unauthenticated attacker to conduct a cross-site request forgery (CSRF) attack . Only SSL VPN in web mode or full mode are impacted by this vulnerability.

MEDIUM · CVSS 6.3 EPSS 0.00292
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-345Insufficient Verification of Data Authenticity
▤

Affected Products & Versions

7
fortinet fortiproxy>= 1.2.0 and <= 1.2.11
fortinet fortiproxy>= 2.0.0 and <= 2.0.3
fortinet fortios>= 5.6.0 and <= 5.6.14
fortinet fortios>= 6.0.0 and <= 6.0.13
fortinet fortios>= 6.2.0 and <= 6.2.9
fortinet fortios>= 6.4.0 and <= 6.4.6
fortinet fortiosall versions
▣

Scoring & Timeline

6.3
MEDIUM · 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 NVD08 Dec 2021 · 12:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
partial
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/advisory/FG-IR-20-158PatchVendor Advisory
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