CVE-2021-24019

CRITICAL

An insufficient session expiration vulnerability [CWE- 613] in FortiClientEMS versions 6.4.2 and below, 6.2.8 and below may allow an attacker to reuse the unexpired admin user session IDs to gain a...

Affects 1 product across 1 vendor.

BCS8.27
CVSS 3.19.8
EPSS3.8%
Percentile89th
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 FortiClientEMS versions 6.4.2 and below, 6.2.8 and below allows an attacker to reuse unexpired admin user session IDs to gain admin privileges if the session ID is obtained.

BSID: BS-2021-GLOBAL-246300-C • Model: /workspace/models/qwen2.5-coder-32b-instruct-bf16 • Confidence: HIGH

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Frequently Asked Questions
What is CVE-2021-24019?
An insufficient session expiration vulnerability in FortiClientEMS versions 6.4.2 and below, 6.2.8 and below allows an attacker to reuse unexpired admin user session IDs to gain admin privileges if the session ID is obtained.
What is the CVSS score for CVE-2021-24019?
CVE-2021-24019 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: 3.8%.
Is CVE-2021-24019 actively exploited?
No confirmed active exploitation of CVE-2021-24019 as of 2026-05-30.
How do I remediate CVE-2021-24019?
Priority: IMMEDIATE. Advisory: https://fortiguard.com/advisory/FG-IR-20-072 PSIRT: [email protected]
What systems are affected by CVE-2021-24019?
CVE-2021-24019 affects: Fortinet.
Vulnerability Details
CVE IDCVE-2021-24019
BSIDBS-2021-GLOBAL-246300-C BreachSpider Global ID
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2021-10-06
Last Modified2024-11-21
ICS Relevance55%
Weakness (CWE)
Domains
NETWORK-INFRA
SourceNVD
Official Description

An insufficient session expiration vulnerability [CWE- 613] in FortiClientEMS versions 6.4.2 and below, 6.2.8 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 can intercept a valid session ID.

Exploitation Likelihood: HIGH

Affected Products
VendorProductFixed Version
Fortinet Forticlient Endpoint Management Server
Remediation
View Vendor Advisory →

Remediation Priority: IMMEDIATE

Vendor PSIRT: [email protected]
Threat Intelligence
● Threat Intelligence Validated: July 2026 | Threat Age: 1753 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 Hash9a71d3db3a2f093181efb9fa49c785213c7e46218f0412b499844bfe556d21cd83b15b54d032a3da9d48142adf6c1a5b4dc152e31ed73d0dea845f9c9f84e12c
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