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CVE-2021-24018

HIGH
8.8
CVSS Score
Published: August 4, 2021 at 02:52 PM UTC
Updated: June 17, 2026 at 03:39 AM UTC
1 product affected across 1 vendorFortiOS

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Severity
HIGH8.8
Exploit prediction
EPSS 1%
SSVC
No known exploit

Description

A buffer underwrite vulnerability in the firmware verification routine of FortiOS before 7.0.1 may allow an attacker located in the adjacent network to potentially execute arbitrary code via a specifically crafted firmware image.

Affected

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

FortiOS· Fortinet
95%
v < 6.2.10v < 7.0.16.4.0 ≤ v < 6.4.77.0.0
Affected range stops below 6.2.10, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.7, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.0.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

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

Patch and advisory references

References (1)

x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://fortiguard.com/advisory/FG-IR-21-046

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
ADJACENT_NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-787

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