CVE-2020-29016

Name: CVE-2020-29016
Creator: NVD / NIST
Published: 2021-01-14T16:15:18.023+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.30%

Last modified Jun 17, 2026

CVE-2020-29016 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A stack-based buffer overflow vulnerability in FortiWeb 6.3.0 through 6.3.5 and version before 6.2.4 may allow an unauthenticated, remote attacker to overwrite the content of the stack and potentially execute arbitrary code by sending a crafted request with a large certname.. EPSS estimates a 3.30% chance of exploitation in the next 30 days.

Description

A stack-based buffer overflow vulnerability in FortiWeb 6.3.0 through 6.3.5 and version before 6.2.4 may allow an unauthenticated, remote attacker to overwrite the content of the stack and potentially execute arbitrary code by sending a crafted request with a large certname.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.30%

87.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Fortinet	Fortiweb	< 6.2.4
Fortinet	Fortiweb	>= 6.3.0, <= 6.3.5

References

https://www.fortiguard.com/psirt/FG-IR-20-125Vendor Advisory
https://www.fortiguard.com/psirt/FG-IR-20-125Vendor Advisory

Timeline

Published: Jan 14, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-29016?

How severe is CVE-2020-29016?

CVE-2020-29016 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.30% probability of exploitation in the next 30 days.

How do I fix CVE-2020-29016?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-29016?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST