Vulnerability Intelligence Report
CVE-2021-42911
A Format String 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 in the mainfunction.cgi file via a crafted HTTP message containing malformed QUERY STRING, which could let a remote malicious user execute arbitrary code.
No Active Exploit Signals
CVSS Base Score
9.8
CRITICAL
EPSS Probability:3.30%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| draytek | vigor2960_firmware | all |
| draytek | vigor2960 | all |
| draytek | vigor3900_firmware | all |
| draytek | vigor3900 | all |
| draytek | vigor300b_firmware | all |
| draytek | vigor300b | all |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
3.302%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | MITRE Corporation · N/A · USA |
| Reserved | 2021-10-25T00:00:00 |
| Published | 2022-03-29T19:30:16 |
| Last Updated | 2024-08-04T03:47:12 |
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