CVE-2025-54820: fortinet fortimanager Stack-based Buffer Overflow
Vulnerability summary
CVE-2025-54820 is a high (CVSS 8.1) Stack-based Buffer Overflow vulnerability in fortinet fortimanager. EPSS estimates a 0.89% chance of exploitation in the next 30 days, higher than 58.5% of scored vulnerabilities.
Timeline
- 10-03-2026PublishedVulnerability first disclosed.
- 12-03-2026Last modifiedVulnerability information updated.
Description
A Stack-based Buffer Overflow vulnerability [CWE-121] vulnerability in Fortinet FortiManager 7.4.0 through 7.4.2, FortiManager 7.2.0 through 7.2.10, FortiManager 6.4 all versions may allow a remote unauthenticated attacker to execute unauthorized commands via crafted requests, if the service is enabled. The success of the attack depends on the ability to bypass the stack protection mechanisms.
CVSS metrics
2 scores · 2 sources · 1 version- CVE.orgCNA7.0HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:RDiffers
EPSS trend
Probability
0.89%
Chance of exploitation in the next 30 days
Percentile
59%
Versus all other CVEs
30-day change
+0.02 pp
From 0.87% on 19-09-2026
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
Fortinet1 product
- fortimanager≥ 7.4.0, ≤ 7.4.2 | ≥ 7.2.0, ≤ 7.2.10 | ≥ 6.4.0, ≤ 6.4.15 | ≥ 6.4.0, < 7.2.11 | ≥ 7.4.0, < 7.4.3
1 vendor · 1 product
References
1 links- fortiguard.fortinet.com/psirt/FG-IR-26-098Vendor Advisory