CVE-2021-24018
A buffer underwrite vulnerability in the firmware verification routine of FortiOS before 7.0.1...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Adjacent network
- Complexity
- Low
- Privileges needed
- High
- User interaction
- None
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2021-24018- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:U/RC:C - Updated
- 2026-11-02
EUVDEUVD-2021-10938
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.
- Record
EUVD-2021-10938- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L/E:X/RL:U/RC:C - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-q8x9-vj32-mh5w
A buffer underwrite vulnerability in the firmware verification routine of FortiOS before 7.0.1...
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.
- Record
GHSA-q8x9-vj32-mh5w- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-24018- CVSS 3.1
- 4.3 Medium
CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L - CVSS 3.1
- 8.8 High
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 5.8 Medium
AV:A/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-787
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-24018 is a medium vulnerability (CVSS 4.3) in Fortinet Fortios, published August 4, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.03%, the 64th percentile. No source names a fixed version.