Memory leak in Fortinet FortiSwitch
Priority LOW 29CWE-401Published · Updated
Key facts
- Attack vector
- Adjacent network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-401.
Summary
A missing release of memory after effective lifetime vulnerability in FortiSwitch 6.4.0 to 6.4.6, 6.2.0 to 6.2.6, 6.0.0 to 6.0.6, 3.6.11 and below may allow an attacker on an adjacent network to exhaust available memory by sending specifically crafted LLDP/CDP/EDP packets to the device.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00381 32nd 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
- Partial
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 FortiSwitch | FortiSwitch 6.4.0 to 6.4.6, 6.2.0 to 6.2.6, 6.0.0 to 6.0.6, 3.6.11 and below | — | No fix listed | CNA |
- Fortinet FortiSwitch VendorFortinet Affected FortiSwitch 6.4.0 to 6.4.6, 6.2.0 to 6.2.6, 6.0.0 to 6.0.6, 3.6.11 and below Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:fortinet:fortiswitch:*:*:*:*:*:*:*:* | up to 3.6.11; 6.0.0 – 6.0.6; 6.2.0 – 6.2.6; 6.4.0 – 6.4.6 | Vulnerable | Fortinet |
- cpe:2.3:o:fortinet:fortiswitch:*:*:*:*:*:*:*:* Versions up to 3.6.11; 6.0.0 – 6.0.6; 6.2.0 – 6.2.6; 6.4.0 – 6.4.6 Vulnerable ·Fortinet
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-26111
- 2026-10-03 Alias added: GHSA-4mmv-85v4-q6hm
References
More Fortinet Fortiswitch vulnerabilities
- TI-2016-05932 Buffer overflow in the Cookie parser in Fortinet FortiOS 4.x before 4.1.11, 4.2.x before… CVSS 3.0CRITICAL 9.8
- TI-2023-10911 A buffer underwrite ('buffer underflow') vulnerability in the administrative interface of… CVSS 3.1CRITICAL 9.3
- TI-2024-32585 A unverified password change vulnerability in Fortinet FortiSwitch GUI may allow a remote… CVSS 3.1CRITICAL 9.3
- TI-2023-19369 Hard-coded credentials in Fortinet FortiSwitch CVSS 3.1CRITICAL 9.8
- TI-2016-03938 Fortinet FortiSwitch FSW-108D-POE, FSW-124D, FSW-124D-POE, FSW-224D-POE, FSW-224D-FPOE… CVSS 3.0CRITICAL 9.8
- TI-2019-13179 Uncontrolled resource consumption in Fortinet FortiSwitch CVSS 3.1HIGH 7.5
Sources
- CVE-2021-26111 · CVE Program
- CVE-2021-26111 · NVD
- FIRST EPSS
- GHSA-4mmv-85v4-q6hm · 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