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CVE-2026-39811

MEDIUMCVSS 4.9/10EPSS 0.37%

Last modified

CVE-2026-39811 is a medium-severity vulnerability rated 4.9/10 on the CVSS scale. A integer overflow or wraparound vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4 all versions, FortiWeb 7.2 all versions, FortiWeb 7.0 all versions may allow attacker to denial of service via <insert attack vector here>. EPSS estimates a 0.37% chance of exploitation in the next 30 days.

Description

A integer overflow or wraparound vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4 all versions, FortiWeb 7.2 all versions, FortiWeb 7.0 all versions may allow attacker to denial of service via <insert attack vector here>

Metrics

CVSS 3.1
4.9/10

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

EPSS Probability
0.37%

28.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
FortinetFortiweb>= 7.0.0, <= 7.0.13
FortinetFortiweb>= 7.2.0, <= 7.2.13
FortinetFortiweb>= 7.4.0, <= 7.4.12
FortinetFortiweb>= 7.6.0, < 7.6.7
FortinetFortiweb>= 8.0.0, < 8.0.4

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-39811?
A integer overflow or wraparound vulnerability in Fortinet FortiWeb 8.0.0 through 8.0.3, FortiWeb 7.6.0 through 7.6.6, FortiWeb 7.4 all versions, FortiWeb 7.2 all versions, FortiWeb 7.0 all versions may allow attacker to denial of service via <insert attack vector here>
How severe is CVE-2026-39811?
CVE-2026-39811 has a CVSS score of 4.9/10 (MEDIUM severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.
How do I fix CVE-2026-39811?
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-2026-39811?

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

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Source: NVD / NIST