How severe is CVE-2021-20123?

CVE-2021-20123 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-20123 being actively exploited?

Yes. CVE-2021-20123 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-09-03, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2021-20123?

CVE-2021-20123 affects Draytek Vigorconnect. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-20123?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2021-20123 have an EU (EUVD) identifier?

Yes. CVE-2021-20123 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-7580. It is also flagged as exploited in the EUVD (since 2024-09-03).

When was CVE-2021-20123 published?

CVE-2021-20123 was published on 2021-10-13 and last updated on 2026-06-17.

CVE-2021-20123

CVE-2021-20123 is a high-severity vulnerability in Draytek Vigorconnect with a CVSS 3.x base score of 7.5. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2024-09-03). The underlying weakness is classified as CWE-22.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 74% (99th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2024-09-03)
EU (EUVD) id: EUVD-2021-7580
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2024-09-03)
Weakness: CWE-22
Affected product: Draytek Vigorconnect
Published: 2021-10-13
Last modified: 2026-06-17

Description

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

Frequently asked questions

What is CVE-2021-20123?: A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the DownloadFileServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.
How severe is CVE-2021-20123?: CVE-2021-20123 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-20123 being actively exploited?: Yes. CVE-2021-20123 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2024-09-03, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2021-20123?: CVE-2021-20123 affects Draytek Vigorconnect. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-20123?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2021-20123 have an EU (EUVD) identifier?: Yes. CVE-2021-20123 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-7580. It is also flagged as exploited in the EUVD (since 2024-09-03).
When was CVE-2021-20123 published?: CVE-2021-20123 was published on 2021-10-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:draytek:vigorconnect:1.6.0:beta3:*:*:*:*:*:*

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