8.8

CVE-2021-36173: fortinet fortinet fortios Out-of-bounds Write

CVSS: 8.8v3.1HighModified
Published 08-12-2021Last modified 25-10-2024
Open JSON

Vulnerability summary

CVE-2021-36173 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in fortinet fortinet fortios. EPSS estimates a 1.55% chance of exploitation in the next 30 days, higher than 74.6% of scored vulnerabilities.

Overall risk
36/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (NVD)
EPSS score
1.55%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 08-12-2021
    PublishedVulnerability first disclosed.
  2. 25-10-2024
    Last modifiedVulnerability information updated.

Description

A heap-based buffer overflow in the firmware signature verification function of FortiOS versions 7.0.1, 7.0.0, 6.4.0 through 6.4.6, 6.2.0 through 6.2.9, and 6.0.0 through 6.0.13 may allow an attacker to execute arbitrary code via specially crafted installation images.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.55%

Chance of exploitation in the next 30 days

Percentile

75%

Versus all other CVEs

30-day change

+0.11 pp

From 1.44% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.55%

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

Fortinet2 products
  • fortinet fortiosFortiOS 7.0.1, 7.0.0, 6.4.0 through 6.4.6, 6.2.0 through 6.2.9, 6.0.0 through 6.0.13
  • fortiosEOL≥ 6.0.0, ≤ 6.0.13 | ≥ 6.2.0, ≤ 6.2.9 | ≥ 6.4.0, ≤ 6.4.6 | 7.0.0 | 7.0.1

1 vendor · 2 products

References

1 links