CVE-2021-42911
Last modified
CVE-2021-42911 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 3.30% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Draytek | Vigor2960 Firmware | <= 1.5.1.3 |
| Draytek | Vigor3900 Firmware | <= 1.5.1.3 |
| Draytek | Vigor300b Firmware | <= 1.5.1.3 |
References
- https://gist.github.com/Cossack9989/e9c1c2d2e69b773ca4251acdd77f2835Exploit, Third Party Advisory
- https://gist.github.com/Cossack9989/e9c1c2d2e69b773ca4251acdd77f2835Exploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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