CVE-2021-36173: Heap-based Buffer Overflow in firmware signature verification
First published: Tue Dec 07 2021(Updated: )
A heap-based buffer overflow [CWE-122] in the firmware signature verification function of FortiOS may allow an attacker to execute arbitrary code via specially crafted installation images.
Credit: psirt@fortinet.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Fortinet FortiOS IPS Engine | >=6.0.0<=6.0.13 | |
| Fortinet FortiOS IPS Engine | >=6.2.0<=6.2.9 | |
| Fortinet FortiOS IPS Engine | >=6.4.0<=6.4.6 | |
| Fortinet FortiOS IPS Engine | =7.0.0 | |
| Fortinet FortiOS IPS Engine | =7.0.1 | |
| Fortinet Fortigate 1100e | ||
| Fortinet Fortigate | ||
| Fortinet Fortigate-2600f | ||
| Fortinet FortiGate 3500F | ||
| Fortinet Fortigate 400e | ||
| Fortinet Fortigate 600e | ||
| Fortinet FortiGate 1800F | ||
| Fortinet Fortigate 2200e | ||
| Fortinet Fortigate 3300e | ||
| Fortinet Fortigate 3600e | ||
| Fortinet FortiGate 40F | ||
| Fortinet Fortigate | ||
| Fortinet Fortigate-7121f |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2021-36173?
CVE-2021-36173 is classified as a high severity vulnerability due to its potential to allow arbitrary code execution.
How do I fix CVE-2021-36173?
To fix CVE-2021-36173, upgrade FortiOS to a version that is not vulnerable, specifically versions later than those listed in the advisory.
Which versions of FortiOS are affected by CVE-2021-36173?
CVE-2021-36173 affects FortiOS versions from 6.0.0 to 6.0.13, 6.2.0 to 6.2.9, 6.4.0 to 6.4.6, and 7.0.0 to 7.0.1.
What type of vulnerability is CVE-2021-36173?
CVE-2021-36173 is a heap-based buffer overflow that occurs in the firmware signature verification function.
Can CVE-2021-36173 be exploited remotely?
Yes, CVE-2021-36173 can be exploited remotely if an attacker provides specially crafted installation images.
- agent/type
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- collector/fortiguard-psirt-latest
- source/FortiGuard
- alias/CVE-2021-36173
- collector/fortiguard-psirt
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- agent/first-publish-date
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- source/MITRE
- agent/last-modified-date
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- agent/softwarecombine
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- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/fortinet
- canonical/fortinet fortios ips engine
- version/fortinet fortios ips engine/6.0.0
- version/fortinet fortios ips engine/6.0.13
- version/fortinet fortios ips engine/6.2.0
- version/fortinet fortios ips engine/6.2.9
- version/fortinet fortios ips engine/6.4.0
- version/fortinet fortios ips engine/6.4.6
- version/fortinet fortios ips engine/7.0.0
- version/fortinet fortios ips engine/7.0.1
- canonical/fortinet fortigate 1100e
- canonical/fortinet fortigate
- canonical/fortinet fortigate-2600f
- canonical/fortinet fortigate 3500f
- canonical/fortinet fortigate 400e
- canonical/fortinet fortigate 600e
- canonical/fortinet fortigate 1800f
- canonical/fortinet fortigate 2200e
- canonical/fortinet fortigate 3300e
- canonical/fortinet fortigate 3600e
- canonical/fortinet fortigate 40f
- canonical/fortinet fortigate-7121f