1. Home
  2. CVE Database
  3. CVE-2021-42911
CRITICAL · 9.8

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 containi...

Vulnerability 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 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH

Affected Products

VendorProductVersions
DraytekVigor2960 Firmware<= 1.5.1.3
DraytekVigor2960-
DraytekVigor3900 Firmware<= 1.5.1.3
DraytekVigor3900-
DraytekVigor300B Firmware<= 1.5.1.3
DraytekVigor300B-

Related Weaknesses (CWE)

CWE-134

References

FAQ

What is CVE-2021-42911?

CVE-2021-42911 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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 containi...

How severe is CVE-2021-42911?

CVE-2021-42911 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2021-42911?

Check the references section above for vendor advisories and patch information. Affected products include: Draytek Vigor2960 Firmware, Draytek Vigor2960, Draytek Vigor3900 Firmware, Draytek Vigor3900, Draytek Vigor300B Firmware.