CVE-2021-36193: fortinet fortiadc Stack-based Buffer Overflow
CVSS: 7.2v3.1HighModified
Published 02-02-2022Last modified 13-01-2026
Vulnerability summary
CVE-2021-36193 is a high (CVSS 7.2) Stack-based Buffer Overflow vulnerability in fortinet fortiadc. EPSS estimates a 0.82% chance of exploitation in the next 30 days, higher than 56.3% of scored vulnerabilities.
CVSS score
7.2/10
010
High · v3.1 (NVD)EPSS score
0.82%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 02-02-2022PublishedVulnerability first disclosed.
- 13-01-2026Last modifiedVulnerability information updated.
Description
Multiple stack-based buffer overflows in the command line interpreter of FortiWeb before 6.4.2 may allow an authenticated attacker to achieve arbitrary code execution via specially crafted commands.
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 7.2Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:HSources2 sources · 6.3–7.2
- CVE.orgCNA6.3MediumCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:CDiffers
Medium 6.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
0.82%
Chance of exploitation in the next 30 days
Percentile
56%
Versus all other CVEs
30-day change
0.00 pp
From 0.82% on 19-09-2026
19-09-202619-10-2026
EPSS score0.82%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-121Stack-based Buffer OverflowA stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Fortinet10 products
- fortiadc7.0.0 | ≥ 6.2.0, ≤ 6.2.2 | ≥ 6.1.0, ≤ 6.1.6 | ≥ 6.0.0, ≤ 6.0.4 | ≥ 5.4.0, ≤ 5.4.5 | ≥ 5.3.0, ≤ 5.3.7 | ≥ 5.2.0, ≤ 5.2.8 | ≥ 5.1.0, ≤ 5.1.7 | ≥ 5.0.0, ≤ 5.0.4
- fortiddos5.7.0 | ≥ 5.6.0, ≤ 5.6.1 | ≥ 5.5.0, ≤ 5.5.1 | ≥ 5.4.0, ≤ 5.4.3 | ≥ 5.3.0, ≤ 5.3.2 | 5.2.0 | 5.1.0 | 5.0.0 | 4.7.0 | 4.6.0 | 4.5.0 | ≥ 4.4.0, ≤ 4.4.2
- fortiddos-cm≥ 5.5.0, ≤ 5.5.1 | ≥ 5.4.0, ≤ 5.4.3 | ≥ 5.3.0, ≤ 5.3.1 | 5.2.0 | 5.1.0 | 5.0.0 | 4.7.0
- fortiddos-f6.3.0 | ≥ 6.2.0, ≤ 6.2.2 | ≥ 6.1.0, ≤ 6.1.4
- fortifone≥ 3.0.0, ≤ 3.0.11
1 vendor · 10 products
References
1 links- fortiguard.com/advisory/FG-IR-21-132Vendor Advisory