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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (3.52%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 3.52% probability · 89th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-134
- Affected
- draytek/vigor2960 firmware · draytek/vigor3900 firmware · draytek/vigor300b firmware
- Source
- cve@mitre.org
References
- https://gist.github.com/Cossack9989/e9c1c2d2e69b773ca4251acdd77f2835Exploit, Third Party Advisory
- https://gist.github.com/Cossack9989/e9c1c2d2e69b773ca4251acdd77f2835Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.