CVE-2021-43118
9.8
CRITICAL · CVSS 3.1 · EPSS 34.8% (pctl 98)
Patch early
EPSS 34.8% — above the 10% action threshold.
Description
A Remote Command Injection vulnerability exists in DrayTek Vigor 2960 1.5.1.3, DrayTek Vigor 3900 1.5.1.3, and DrayTek Vigor 300B 1.5.1.3 via a crafted HTTP message containing malformed QUERY STRING in mainfunction.cgi, which could let a remote malicious user execute arbitrary code.
Scoring
| CVSS | 9.8 (CRITICAL, v3.1) |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 34.85% — more likely to be exploited than 98% of all CVEs |
| Weakness | CWE-77 |
| On CISA KEV | no |
| Public exploit | none known |
| Published | 2022-03-29 |
| Last modified | 2026-06-17 |
Affected (6)
| Vendor | Product |
|---|---|
| draytek | vigor2960 |
| draytek | vigor2960 firmware |
| draytek | vigor300b |
| draytek | vigor300b firmware |
| draytek | vigor3900 |
| draytek | vigor3900 firmware |
References
→ the Explorer · watch your stack · NVD