CVE-2021-26103 : Security Advisory and Response
Learn about CVE-2021-26103, a medium-severity vulnerability impacting Fortinet FortiOS and SSL VPN portals. Find out the impact, affected versions, and mitigation steps.
This article discusses an insufficient verification of data authenticity vulnerability found in Fortinet FortiOS and its impact on SSL VPN portals.
Understanding CVE-2021-26103
This CVE identifies a security vulnerability that could allow remote attackers to perform a CSRF attack.
What is CVE-2021-26103?
CVE-2021-26103 is an authentication vulnerability in the user interface of FortiProxy and FortiGate SSL VPN portals.
The Impact of CVE-2021-26103
The vulnerability could be exploited by unauthenticated remote attackers to conduct CSRF attacks.
Technical Details of CVE-2021-26103
The vulnerability is rated with a CVSS base score of 6.2, indicating a medium severity level.
Vulnerability Description
It involves insufficient data authenticity verification, affecting FortiOS versions 7.0.0, 6.4.6, and below, as well as FortiProxy versions 2.0.3 and below.
Affected Systems and Versions
Fortinet FortiOS versions 7.0.0 to 5.6.0 and associated SSL VPN portals are impacted.
Exploitation Mechanism
Remote, unauthenticated attackers can exploit the vulnerability through a cross-site request forgery (CSRF) attack.
Mitigation and Prevention
Taking immediate steps and implementing long-term security practices are essential to mitigate the risk.
Immediate Steps to Take
Organizations should apply necessary patches and updates provided by Fortinet.
Long-Term Security Practices
Enhance access control measures and regularly monitor SSL VPN portal activities.
Patching and Updates
Ensure prompt installation of security patches released by Fortinet to address the vulnerability.