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CVE-2021-26103

HIGH

8.8

CVSS Score

Published: December 8, 2021 at 12:01 PM UTC

Updated: June 17, 2026 at 03:42 AM UTC

2 products affected across 1 vendorFortiOSFortiProxy

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Severity

HIGH8.8

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

FortiOS · Fortinet

95%

5.6.0 ≤ v ≤ 5.6.146.0.0 ≤ v ≤ 6.0.136.2.0 ≤ v ≤ 6.2.96.4.0 ≤ v ≤ 6.4.65.6.0 5.6.1 5.6.10 5.6.11 5.6.12 5.6.13 5.6.14 5.6.2 5.6.3 5.6.4 5.6.5 5.6.6 5.6.7 5.6.8 5.6.9 6.0.0 6.0.1 6.0.10 6.0.11 6.0.12 6.0.13 6.0.14 6.0.2 6.0.3 6.0.4 6.0.5 6.0.6 6.0.7 6.0.8 6.0.9 6.2.0 6.2.1 6.2.2 6.2.3 6.2.4 6.2.5 6.2.6 6.2.7 6.2.8 6.2.9 6.4.0 6.4.1 6.4.2 6.4.3 6.4.4 6.4.5 7.0.0

FortiProxy · Fortinet

95%

1.2.0 ≤ v ≤ 1.2.112.0.0 ≤ v ≤ 2.0.3

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://fortiguard.com/advisory/FG-IR-20-158

References (1)

x_refsource_CONFIRMPatchVendor Advisory

Source: [email protected]

https://fortiguard.com/advisory/FG-IR-20-158

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-345

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