Buffer overflow in Fortinet FortiMail
Priority MEDIUM 42CWE-120Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-120 and the CVSS impact.
Summary
Multiple instances of incorrect calculation of buffer size in the Webmail and Administrative interface of FortiMail before 6.4.5 may allow an authenticated attacker with regular webmail access to trigger a buffer overflow and to possibly execute unauthorized code or commands via specifically crafted HTTP requests.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.01095 65th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Total
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Fortinet | Fortinet FortiMail | FortiMail before 6.4.5 | — | No fix listed | CNA |
- Fortinet FortiMail VendorFortinet Affected FortiMail before 6.4.5 Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:* | up to 5.4.12; 5.6.1 to before 6.0.11; 6.2.0 to before 6.2.7; 6.4.0 to before 6.4.5 | Vulnerable | Fortinet |
- cpe:2.3:a:fortinet:fortimail:*:*:*:*:*:*:*:* Versions up to 5.4.12; 5.6.1 to before 6.0.11; 6.2.0 to before 6.2.7; 6.4.0 to before 6.4.5 Vulnerable ·Fortinet
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-22129
- 2026-10-03 Alias added: GHSA-4466-79c6-7gv2
References
More Fortinet Fortimail vulnerabilities
- TI-2026-65779 Path traversal in Fortinet FortiMail KEVCVSS 3.1CRITICAL 9.8
- TI-2025-23811 Stack-based buffer overflow in Fortinet FortiNDR KEVCVSS 3.1CRITICAL 9.8
- TI-2020-07433 Improper authentication in Fortinet FortiMail CVSS 3.1CRITICAL 9.8
- TI-2021-14584 An improper authentication vulnerability in FortiMail before 7.0.1 may allow a remote… CVSS 3.1CRITICAL 9.8
- TI-2021-06324 SQL injection in Fortinet FortiMail CVSS 3.1CRITICAL 9.8
- TI-2023-25708 Improper access control in Fortinet FortiMail CVSS 3.1CRITICAL 9.0
Sources
- CVE-2021-22129 · CVE Program
- CVE-2021-22129 · NVD
- FIRST EPSS
- GHSA-4466-79c6-7gv2 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences