CVE-2021-24018

mediumpriority · track · 35EPSS 0.010 · 64 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.03% (64th) EPSS

CVSS 5.8 · medium

Is it mine?

38 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · fstec_bdu

EPSS · scored 2026-10-24

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 4.3–8.8

v2.05.8mediumAV:A/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 6.5 · impact 6.4

v3.18.8highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.8 · impact 5.9

v3.18.8highAV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.14.3mediumCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:U/RC:Csecondary · ENISA EU

v3.14.3mediumCVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:Lsecondary · psirt@fortinet.comexploitability 0.9 · impact 3.4

v3.18.1highCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Trackcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-119USCWE-124US

affected products (38)

Products and version ranges known to be affected.

Fortinet Fortinet FortiOS≤ FortiOS before 7.0.1enisa_euvdEU
Fortinet Inc. FortiOS≤ 7.0.0fstec_bduRU
Fortinet Inc. FortiOS5.0.0 → 5.0.14fstec_bduRU
Fortinet Inc. FortiOS5.2.0 → 5.2.15fstec_bduRU
Fortinet Inc. FortiOS5.4.0 → 5.4.13fstec_bduRU
Fortinet Inc. FortiOS5.6.0 → 5.6.14fstec_bduRU
Fortinet Inc. FortiOS6.0.0 → 6.0.13fstec_bduRU
Fortinet Inc. FortiOS6.2.0 → 6.2.9fstec_bduRU
Fortinet Inc. FortiOS6.4.0 → 6.4.6fstec_bduRU
Fortinet Inc. FortiProxy≤ 7.0.1fstec_bduRU
Fortinet Inc. FortiProxy≤ 7.0.0fstec_bduRU
Fortinet Inc. FortiProxy1.0.0 → 1.0.7fstec_bduRU
Fortinet Inc. FortiProxy1.1.0 → 1.1.6fstec_bduRU
Fortinet Inc. FortiProxy1.2.0 → 1.2.13fstec_bduRU
Fortinet Inc. FortiProxy2.0.0 → 2.0.7fstec_bduRU
Fortinet Inc. FortiSwitch6.0.0 → 6.0.7fstec_bduRU
Fortinet Inc. FortiSwitch6.2.0 → 6.2.7fstec_bduRU
Fortinet Inc. FortiSwitch6.4.0 → 6.4.8fstec_bduRU
Fortinet Inc. FortiSwitch7.0.0 → 7.0.2fstec_bduRU
Fortinet Inc. FortiWeb≤ 5.9.1fstec_bduRU

showing 20 of 38

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu NVD CVE.org MITRE

published 2021-08-04modified 2026-06-17

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+16030 more

references (7)

External citations — patches, advisories, analysis.

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