CVE-2020-6649

CRITICAL

An insufficient session expiration vulnerability in FortiNet's FortiIsolator version 2.0.1 and below may allow an attacker to reuse the unexpired admin user session IDs to gain admin privileges, sh...

Affects 1 product across 1 vendor.

BCS7.11
CVSS 3.19.8
EPSS1.5%
Percentile72th
PatchPatched
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
CWE Weakness Definitions
CWE-613: CWE-613
◆ SAGE Intelligence — CITED Relevance Research Team

An insufficient session expiration vulnerability in FortiNet's FortiIsolator version 2.0.1 and below allows attackers to reuse unexpired admin user session IDs to gain admin privileges, if they can obtain the session ID.

BSID: BS-2021-GLOBAL-211316-C • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

Is this CVE in your environment?

BreachSpider monitors your ICS/OT environment for vulnerabilities like this one. No agents or network access required. Free to start.

Check My Environment →
Frequently Asked Questions
What is CVE-2020-6649?
An insufficient session expiration vulnerability in FortiNet's FortiIsolator version 2.0.1 and below allows attackers to reuse unexpired admin user session IDs to gain admin privileges, if they can obtain the session ID.
What is the CVSS score for CVE-2020-6649?
CVE-2020-6649 has CVSS 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 1.5%.
Is CVE-2020-6649 actively exploited?
No confirmed active exploitation of CVE-2020-6649 as of 2026-05-30.
How do I remediate CVE-2020-6649?
Priority: IMMEDIATE. Advisory: https://fortiguard.com/advisory/FG-IR-20-011 PSIRT: [email protected]
What systems are affected by CVE-2020-6649?
CVE-2020-6649 affects: Fortinet.
Vulnerability Details
CVE IDCVE-2020-6649
BSIDBS-2021-GLOBAL-211316-C BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2021-02-08
Last Modified2024-11-21
ICS Relevance55%
Weakness (CWE)
CWE-613
Domains
NETWORK-INFRA
SourceNVD
Official Description

An insufficient session expiration vulnerability in FortiNet's FortiIsolator version 2.0.1 and below may allow an attacker to reuse the unexpired admin user session IDs to gain admin privileges, should the attacker be able to obtain that session ID (via other, hypothetical attacks)

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

The vulnerability stems from the lack of proper session expiration mechanisms, enabling attackers to maintain unauthorized access if they intercept a valid admin session ID.

Exploitation Likelihood: HIGH

Affected Products
VendorProductFixed Version
Fortinet Fortiisolator —
Remediation
View Vendor Advisory →

Remediation Priority: IMMEDIATE

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: July 2026 | Threat Age: 1993 Days
CISA KEVNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
SAGE Enrichment Record — provenance & audit hash
Model/workspace/models/qwen2.5-coder-32b-instruct-bf16
ConfidenceHIGH
Enriched At2026-05-24
SHA-512 Audit Hashe949dd85ef522b97fcd02d111ab88c5c5fea0f0022a2f1ea45c2d9cab5bd7213e1c1c5941ddcd7e355d94fe7f2520908e86259ddef2f10a16584a051a5eddb91
Related CVEs affecting Fortinet
CVE-2005-3057 10.0 The FTP component in FortiGate 2.8 running FortiOS 2.8MR10 and v3beta, and ot... CVE-2024-47575 9.8 A missing authentication for critical function in FortiManager 7.6.0, FortiMa... CVE-2024-23109 9.8 An improper neutralization of special elements used in an os command ('os com... CVE-2024-23108 9.8 An improper neutralization of special elements used in an os command ('os com... CVE-2019-16153 9.8 A hard-coded password vulnerability in the Fortinet FortiSIEM database compon...
View all Fortinet CVEs →

Critical Severity - Know Your Exposure

A CVSS 9.8 vulnerability in your ICS environment cannot wait. BreachSpider maps critical CVEs to your specific assets and tells you what to fix first.

Check Your Assets Free →