totolink EX300_v2, ver V4.0.3c.140_B20210429 and A720R ,ver V4.1.5cu.470_B20200911 have…
Priority LOW 30CWE-770Published · 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 · NVD. Fix status from CNA. Impact type from CWE-770.
Summary
totolink EX300_v2, ver V4.0.3c.140_B20210429 and A720R ,ver V4.1.5cu.470_B20200911 have an issue which causes uncontrolled resource consumption.
Why it matters now
EPSS 0.00547 46th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:totolink:ex300_v2_firmware:4.0.3c.140_b20210429:*:*:*:*:*:*:* | 4.0.3c.140_b20210429 | Vulnerable | TOTOLINK |
| cpe:2.3:h:totolink:ex300_v2:-:*:*:*:*:*:*:* | not specified by NVD | Running on | TOTOLINK |
| cpe:2.3:o:totolink:a720r_firmware:4.1.5cu.470_b20200911:*:*:*:*:*:*:* | 4.1.5cu.470_b20200911 | Vulnerable | TOTOLINK |
| cpe:2.3:h:totolink:a720r:-:*:*:*:*:*:*:* | not specified by NVD | Running on | TOTOLINK |
- cpe:2.3:o:totolink:ex300_v2_firmware:4.0.3c.140_b20210429:*:*:*:*:*:*:* Versions 4.0.3c.140_b20210429 Vulnerable ·TOTOLINK
- cpe:2.3:h:totolink:ex300_v2:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TOTOLINK
- cpe:2.3:o:totolink:a720r_firmware:4.1.5cu.470_b20200911:*:*:*:*:*:*:* Versions 4.1.5cu.470_b20200911 Vulnerable ·TOTOLINK
- cpe:2.3:h:totolink:a720r:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·TOTOLINK
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-43662
- 2026-10-03 Alias added: GHSA-mj9h-gc79-chg3
References
More TOTOLINK A720r Firmware vulnerabilities
- TI-2025-08527 TOTOLINK A720R cstecgi.cgi setParentalRules buffer overflow CVSS 4.0HIGH 8.7
- TI-2025-37756 A command injection vulnerability exists in the ToToLink A720R Router firmware… CVSS 3.1MEDIUM 6.5
- TI-2025-37755 A command injection vulnerability exists in the ToToLink A720R Router firmware… CVSS 3.1MEDIUM 6.5
- TI-2025-03802 TOTOLINK A720R cstecgi.cgi information disclosure CVSS 4.0MEDIUM 6.9
- TI-2025-03801 TOTOLINK A720R Config cstecgi.cgi information disclosure CVSS 4.0MEDIUM 6.9
- TI-2025-03800 TOTOLINK A720R Log cstecgi.cgi access control CVSS 4.0MEDIUM 6.9
Sources
- CVE-2021-43662 · CVE Program
- CVE-2021-43662 · NVD
- FIRST EPSS
- GHSA-mj9h-gc79-chg3 · 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