CISA KEV · Known exploitedHigh

CVE-2021-20124

DrayTek VigorConnect

A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the WebServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.

CVSS
7.5
EPSS
69.2%
99.3% percentile
CISA KEV
Listed
Published
2021.10.14
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability69.2%
Technical severityCVSS 7.5

Vulnerability overview

A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the WebServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.

Affected product and versions

Product
DrayTek VigorConnect
Affected versions
1.6.0-B3, 1.6.0
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
CISA required action

Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Due date: 2024.09.24
  1. 1
    Identify

    Confirm that DrayTek VigorConnect and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
CWE-22
KEV added
2024.09.03
Ransomware use
미확인
CVE-2021-20124 — DrayTek VigorConnect | SECUFOCUS NOW