9.8

CVE-2023-42789: fortinet fortios Out-of-bounds Write

CVSS: 9.8v3.1CriticalModified
Published 12-03-2024Last modified 08-07-2026
Open JSON

Vulnerability summary

CVE-2023-42789 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in fortinet fortios. EPSS estimates a 3.31% chance of exploitation in the next 30 days, higher than 88.4% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (NVD)
EPSS score
3.31%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 12-03-2024
    PublishedVulnerability first disclosed.
  2. 08-07-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

3.31%

Chance of exploitation in the next 30 days

Percentile

88%

Versus all other CVEs

30-day change

0.00 pp

From 3.31% on 20-09-2026

20-09-202620-10-2026
EPSS score
3.31%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Fortinet3 products
  • fortios≥ 7.4.0, ≤ 7.4.1 | ≥ 6.2.0, ≤ 6.2.15 | ≥ 6.4.0, ≤ 6.4.14 | ≥ 7.0.0, ≤ 7.0.12 | ≥ 7.2.0, ≤ 7.2.5 | 7.4.0 | 7.4.1
  • fortiproxy≥ 2.0.0, ≤ 2.0.13 | ≥ 7.0.0, ≤ 7.0.12 | ≥ 7.2.0, ≤ 7.2.6 | 7.4.0
  • fortisase23.2.b

1 vendor · 3 products

References

1 links