CVE-2021-36173 : A heap-based buffer overflow in the firmware signature verification function of

A heap-based buffer overflow in the firmware signature verification function of FortiOS versions 7.0.1, 7.0.0, 6.4.0 through 6.4.6, 6.2.0 through 6.2.9, and 6.0.0 through 6.0.13 may allow an attacker to execute arbitrary code via specially crafted installation images.

Published 2021-12-08 19:15:10

Updated 2021-12-10 16:37:23

Source Fortinet, Inc.

View at NVD, CVE.org

Vulnerability category: OverflowMemory CorruptionExecute code

Products affected by CVE-2021-36173

Fortinet » Fortios
Versions from including (>=) 6.4.0 and up to, including, (<=) 6.4.6
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
Matching versions
When used together with: Fortinet » Fortigate-1100e » Version: N/A
When used together with: Fortinet » Fortigate-200f » Version: N/A
When used together with: Fortinet » Fortigate-2600f » Version: N/A
When used together with: Fortinet » Fortigate-3500f » Version: N/A
When used together with: Fortinet » Fortigate-400e » Version: N/A
When used together with: Fortinet » Fortigate-600e » Version: N/A
When used together with: Fortinet » Fortigate 1800f » Version: N/A
When used together with: Fortinet » Fortigate 2200e » Version: N/A
When used together with: Fortinet » Fortigate 3300e » Version: N/A
When used together with: Fortinet » Fortigate 3600e » Version: N/A
When used together with: Fortinet » Fortigate 40f » Version: N/A
When used together with: Fortinet » Fortigate 60f » Version: N/A
When used together with: Fortinet » Fortigate 7121f » Version: N/A
Fortinet » Fortios
Versions from including (>=) 6.0.0 and up to, including, (<=) 6.0.13
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
Matching versions
When used together with: Fortinet » Fortigate-1100e » Version: N/A
When used together with: Fortinet » Fortigate-200f » Version: N/A
When used together with: Fortinet » Fortigate-2600f » Version: N/A
When used together with: Fortinet » Fortigate-3500f » Version: N/A
When used together with: Fortinet » Fortigate-400e » Version: N/A
When used together with: Fortinet » Fortigate-600e » Version: N/A
When used together with: Fortinet » Fortigate 1800f » Version: N/A
When used together with: Fortinet » Fortigate 2200e » Version: N/A
When used together with: Fortinet » Fortigate 3300e » Version: N/A
When used together with: Fortinet » Fortigate 3600e » Version: N/A
When used together with: Fortinet » Fortigate 40f » Version: N/A
When used together with: Fortinet » Fortigate 60f » Version: N/A
When used together with: Fortinet » Fortigate 7121f » Version: N/A
Fortinet » Fortios
Versions from including (>=) 6.2.0 and up to, including, (<=) 6.2.9
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
Matching versions
When used together with: Fortinet » Fortigate-1100e » Version: N/A
When used together with: Fortinet » Fortigate-200f » Version: N/A
When used together with: Fortinet » Fortigate-2600f » Version: N/A
When used together with: Fortinet » Fortigate-3500f » Version: N/A
When used together with: Fortinet » Fortigate-400e » Version: N/A
When used together with: Fortinet » Fortigate-600e » Version: N/A
When used together with: Fortinet » Fortigate 1800f » Version: N/A
When used together with: Fortinet » Fortigate 2200e » Version: N/A
When used together with: Fortinet » Fortigate 3300e » Version: N/A
When used together with: Fortinet » Fortigate 3600e » Version: N/A
When used together with: Fortinet » Fortigate 40f » Version: N/A
When used together with: Fortinet » Fortigate 60f » Version: N/A
When used together with: Fortinet » Fortigate 7121f » Version: N/A
Fortinet » Fortios » Version: 7.0.0
cpe:2.3:o:fortinet:fortios:7.0.0:*:*:*:*:*:*:*
Matching versions
When used together with: Fortinet » Fortigate-1100e » Version: N/A
When used together with: Fortinet » Fortigate-200f » Version: N/A
When used together with: Fortinet » Fortigate-2600f » Version: N/A
When used together with: Fortinet » Fortigate-3500f » Version: N/A
When used together with: Fortinet » Fortigate-400e » Version: N/A
When used together with: Fortinet » Fortigate-600e » Version: N/A
When used together with: Fortinet » Fortigate 1800f » Version: N/A
When used together with: Fortinet » Fortigate 2200e » Version: N/A
When used together with: Fortinet » Fortigate 3300e » Version: N/A
When used together with: Fortinet » Fortigate 3600e » Version: N/A
When used together with: Fortinet » Fortigate 40f » Version: N/A
When used together with: Fortinet » Fortigate 60f » Version: N/A
When used together with: Fortinet » Fortigate 7121f » Version: N/A
Fortinet » Fortios » Version: 7.0.1
cpe:2.3:o:fortinet:fortios:7.0.1:*:*:*:*:*:*:*
Matching versions
When used together with: Fortinet » Fortigate-1100e » Version: N/A
When used together with: Fortinet » Fortigate-200f » Version: N/A
When used together with: Fortinet » Fortigate-2600f » Version: N/A
When used together with: Fortinet » Fortigate-3500f » Version: N/A
When used together with: Fortinet » Fortigate-400e » Version: N/A
When used together with: Fortinet » Fortigate-600e » Version: N/A
When used together with: Fortinet » Fortigate 1800f » Version: N/A
When used together with: Fortinet » Fortigate 2200e » Version: N/A
When used together with: Fortinet » Fortigate 3300e » Version: N/A
When used together with: Fortinet » Fortigate 3600e » Version: N/A
When used together with: Fortinet » Fortigate 40f » Version: N/A
When used together with: Fortinet » Fortigate 60f » Version: N/A
When used together with: Fortinet » Fortigate 7121f » Version: N/A

Exploit prediction scoring system (EPSS) score for CVE-2021-36173

EPSS FAQ

1.16%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 77 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-36173

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
6.8	MEDIUM	AV:N/AC:M/Au:N/C:P/I:P/A:P	8.6	6.4	NIST
Access Vector: Network Access Complexity: Medium Authentication: None Confidentiality Impact: Partial Integrity Impact: Partial Availability Impact: Partial
8.8	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	2.8	5.9	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: High Availability: High
8.0	HIGH	CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H	2.1	5.9	Fortinet, Inc.
Attack Vector: Adjacent Network Attack Complexity: Low Privileges Required: None User Interaction: Required Scope: Unchanged Confidentiality: High Integrity: High Availability: High

CWE ids for CVE-2021-36173

CWE-787 Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

Assigned by: nvd@nist.gov (Primary)

References for CVE-2021-36173

https://fortiguard.com/advisory/FG-IR-21-115

PSIRT Advisories | FortiGuard
Patch;Vendor Advisory

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Vulnerability Details : CVE-2021-36173

Products affected by CVE-2021-36173

Exploit prediction scoring system (EPSS) score for CVE-2021-36173

CVSS scores for CVE-2021-36173

CWE ids for CVE-2021-36173

References for CVE-2021-36173