Is CVE-2021-42911 actively exploited?

CVE-2021-42911 has no public evidence of in-the-wild exploitation as of 2024-11-21.

What is the CVSS score for CVE-2021-42911?

CVE-2021-42911 has a CVSS score of 9.8 (CRITICAL severity). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

How do I patch CVE-2021-42911?

Patch guidance is available from draytek security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-42911.

Fix CVE-2021-42911 - CRITICAL draytek vigor2960 firmware

Q: Which products are affected by CVE-2021-42911?

3 products: draytek vigor2960 firmware, draytek vigor3900 firmware, draytek vigor300b firmware.

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 Metrics

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector: network
Complexity: low
Privileges: none
User Action: none
Scope: unchanged
Confidentiality: high
Integrity: high
Availability: high
Weaknesses: CWE-134

Metadata

Primary Vendor: DRAYTEK
Published: 3/29/2022
Last Modified: 11/21/2024
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

draytek : vigor2960_firmwaredraytek : vigor3900_firmwaredraytek : vigor300b_firmware

Remediation Guidance

Executive Summary

View on NIST NVD