Public proof of concept

CVE-2023-42789

A public proof of concept exists; no exploitation attested.

Published2024-03-12
WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A out-of-bounds write vulnerability in Fortinet FortiOS 7.4.0 through 7.4.1, FortiOS 7.2.0 through 7.2.5, FortiOS 7.0.0 through 7.0.12, FortiOS 6.4.0 through 6.4.14, FortiOS 6.2.0 through 6.2.15, FortiProxy 7.4.0, FortiProxy 7.2.0 through 7.2.6, FortiProxy 7.0.0 through 7.0.12, FortiProxy 2.0.0 through 2.0.13, FortiSASE 23.2.b allows attacker to execute unauthorized code or commands via specially crafted HTTP requests.

Timeline

dates in UTC

2024-03-1215:15CVE publishedNVD
2026-10-2319:23First public proof of conceptPoC-in-GitHub

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-42789?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-42789?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · CISA-ADP

Fortinet FortiOS

Branch	Affected	Fixed in	Source
6.2	≥ 6.2.0, ≤ 6.2.15	no fix published	NVD · CISA-ADP
6.4	≥ 6.4.0, ≤ 6.4.14	no fix published	NVD · CISA-ADP
7.0	≥ 7.0.0, ≤ 7.0.12	no fix published	NVD · CISA-ADP
7.2	≥ 7.2.0, ≤ 7.2.5	no fix published	NVD · CISA-ADP
7.4	= 7.4.0	no fix published	NVD
7.4	= 7.4.1	no fix published	NVD
7.4	≥ 7.4.0, ≤ 7.4.1	no fix published	CISA-ADP

Fortinet fortiproxy

Branch	Affected	Fixed in	Source
2.0	≥ 2.0.0, ≤ 2.0.13	no fix published	NVD · CISA-ADP
7.0	≥ 7.0.0, ≤ 7.0.12	no fix published	NVD · CISA-ADP
7.2	≥ 7.2.0, ≤ 7.2.6	no fix published	NVD · CISA-ADP
7.4	= 7.4.0	no fix published	NVD · CISA-ADP

Fortinet fortipam

Branch	Affected	Fixed in	Source
1.1	≥ 1.1.0, ≤ 1.1.2	no fix published	CISA-ADP
1.0	≥ 1.0.0, ≤ 1.0.3	no fix published	CISA-ADP

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

fortiguard.comVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 1 repository, unverifiedjhonnybonny/CVE-2023-42789

Sources

CISA-ADPSSVC decisionnone2024-03-15
OpenCVESSVC decisionnone—
CNACVSS 3.19.8read 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
CNAweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score3.3 %2026-10-22
PoC-in-GitHubproof of concept1read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2024-03-12
Last Modified: 2026-07-08
NVD status: Modified

Frequently asked questions

What is CVE-2023-42789?

Is CVE-2023-42789 actively exploited?

Active exploitation of CVE-2023-42789 has not been confirmed. Its EPSS score was 3.3% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-42789?

CVE-2023-42789 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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