7.5

CVE-2025-53379: fortinet fortiauthenticator Out-of-bounds Read

CVSS: 7.5v3.1HighAnalyzed
Published 14-07-2026Last modified 22-07-2026
Open JSON

Vulnerability summary

CVE-2025-53379 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in fortinet fortiauthenticator. EPSS estimates a 0.53% chance of exploitation in the next 30 days, higher than 43.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.53%
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. 14-07-2026
    PublishedVulnerability first disclosed.
  2. 22-07-2026
    Last modifiedVulnerability information updated.

Description

A out-of-bounds read vulnerability in Fortinet FortiAuthenticator 6.6.0 through 6.6.2, FortiAuthenticator 6.5 all versions may allow a remote unauthenticated attacker to retrieve sensitive information via a specially crafted request.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.53%

Chance of exploitation in the next 30 days

Percentile

44%

Versus all other CVEs

30-day change

0.00 pp

From 0.53% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.53%

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
  • fortiauthenticator≥ 6.4.0, ≤ 6.4.11 | ≥ 6.3.0, ≤ 6.3.5 | ≥ 6.5.0, ≤ 6.5.7 | ≥ 6.6.0, ≤ 6.6.2

1 vendor · 1 product

References

1 links