9.8

CVE-2023-36553: fortinet fortisiem OS Command Injection

CVSS: 9.8v3.1CriticalModified
Published 14-11-2023Last modified 16-12-2025
Open JSON

Vulnerability summary

CVE-2023-36553 is a critical (CVSS 9.8) OS Command Injection vulnerability in fortinet fortisiem. EPSS estimates a 1.88% chance of exploitation in the next 30 days, higher than 79.2% 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
1.88%
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. 14-11-2023
    PublishedVulnerability first disclosed.
  2. 16-12-2025
    Last modifiedVulnerability information updated.

Description

A improper neutralization of special elements used in an os command ('os command injection') in Fortinet FortiSIEM version 5.4.0 and 5.3.0 through 5.3.3 and 5.2.5 through 5.2.8 and 5.2.1 through 5.2.2 and 5.1.0 through 5.1.3 and 5.0.0 through 5.0.1 and 4.10.0 and 4.9.0 and 4.7.2 allows attacker to execute unauthorized code or commands via crafted API requests.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

1.88%

Chance of exploitation in the next 30 days

Percentile

79%

Versus all other CVEs

30-day change

0.00 pp

From 1.88% on 22-09-2026

22-09-202622-10-2026
EPSS score
1.88%

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

Fortinet1 product
  • fortisiem≥ 5.3.0, ≤ 5.3.3 | ≥ 5.2.5, ≤ 5.2.8 | ≥ 5.2.1, ≤ 5.2.2 | ≥ 5.0.0, ≤ 5.0.1 | ≥ 5.1.0, ≤ 5.1.3 | 4.7.2 | 4.9.0 | 4.10.0 | 5.0.0 | 5.0.1 | 5.2.1 | 5.2.2 | 5.2.5 | 5.2.6 | 5.2.7 | 5.2.8 | 5.3.0 | 5.3.1 | 5.3.2 | 5.3.3 | 5.4.0

1 vendor · 1 product

References

1 links