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ExploitedIn CISA KEV

CVE-2021-20123

Exploitation confirmed. First attested on 2024-09-03 by CISA-ADP, CISA KEV, GCVE · kevintel, GCVE · shadowserver.

  • Published2021-10-13
  • WeaknessCWE-22

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2021-10-1316:15CVE publishedNVD
  2. 2024-09-03Added to the CISA KEV catalogCISA KEV
  3. 2024-09-03Listed as exploited by GCVEGCVE
  4. 2024-09-03Exploitation first reportedCISA KEV
  5. 2024-09-0312:29SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-20123?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-20123?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · CISA-ADP
Draytek vigorconnect
BranchAffectedFixed in
1.6= 1.6.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As tenable, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Draytek VigorConnect
    Affected
    • = 1.6.0-B3no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2021-10-13

Fix

  1. CISA’s required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.due 2024-09-24

Detection

read 2026-11-03 22:42 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2024-09-03
Patch Due Date
2024-09-24
Ransomware Use
Unknown
Required Action
Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published
2021-10-13
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-gc9m-33cp-rmpj

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.

Is CVE-2021-20123 actively exploited?

Yes. CVE-2021-20123 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2024-09-24.

What is the CVSS score for CVE-2021-20123?

CVE-2021-20123 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

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Sources for this record