8.8
HIGH
CVE-2021-26103
FortiProxy/FortiGate SSL VPN CSRF Vulnerability
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.

INFO

Published Date :

Dec. 8, 2021, 12:15 p.m.

Last Modified :

Dec. 9, 2021, 9:11 p.m.

Remotely Exploitable :

Yes !

Impact Score :

5.9

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2021-26103 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Fortinet fortios
2 Fortinet fortiproxy
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-26103.

URL Resource
https://fortiguard.com/advisory/FG-IR-20-158 Patch Vendor Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-26103 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-26103 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Initial Analysis by [email protected]

    Dec. 09, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:H/Au:N/C:P/I:P/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
    Changed Reference Type https://fortiguard.com/advisory/FG-IR-20-158 No Types Assigned https://fortiguard.com/advisory/FG-IR-20-158 Patch, Vendor Advisory
    Added CWE NIST CWE-345
    Added CPE Configuration OR *cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:* versions from (including) 1.2.0 up to (including) 1.2.11 *cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:* versions from (including) 2.0.0 up to (including) 2.0.3 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 5.6.0 up to (including) 5.6.14 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 6.0.0 up to (including) 6.0.13 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 6.2.0 up to (including) 6.2.9 *cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:* versions from (including) 6.4.0 up to (including) 6.4.6 *cpe:2.3:o:fortinet:fortios:7.0.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Dec. 08, 2021

    Action Type Old Value New Value
    Changed 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. 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.
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-26103 is associated with the following CWEs:

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.32 }} -0.00%

score

0.70774

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability