What is CVE-2023-23781?

CVE-2023-23781 is a medium-severity vulnerability in Fortinet Fortiweb, classified under Stack-based Buffer Overflow. CVSS score: 6.4/10. Published 2023-02-16.

How severe is CVE-2023-23781?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Buffer overflow in Fortinet Fortiweb

CVE-2023-23781

A stack-based buffer overflow vulnerability [CWE-121] in FortiWeb version 7.0.1 and below, 6.4 all versions, version 6.3.19 and below SAML server configuration may allow an authenticated attacker to achieve arbitrary code execution via specifically crafted XML files.

Vulnerability class: Buffer Overflow

Published 2023-02-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (51.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Fortinet Fortiweb — versions 7.0.0, 6.4.0, 6.3.6

Weakness classification (CWE)

References

fortiguard.com/psirt/FG-IR-22-151 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-23781?: CVE-2023-23781 is a medium-severity vulnerability in Fortinet Fortiweb, classified under Stack-based Buffer Overflow. CVSS score: 6.4/10. Published 2023-02-16.
How severe is CVE-2023-23781?: Medium severity. CVSS v3 base score is 6.4 out of 10.