Assessment
Why it matters
CISA lists this vulnerability as known to be exploited; exploitation is confirmed; EPSS is 84.6%; technical severity is CVSS 9.8.
On DrayTek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1, cgi-bin/mainfunction.cgi/cvmcfgupload allows remote command execution via shell metacharacters in a filename when the text/x-python-script content type is used, a different issue than CVE-2020-14472.
Who should care
- Teams operating Multiple Vigor Routers, Vigor2960 Firmware, Vigor300b Firmware +1 more
- Vulnerability and exposure management teams
- Security operations teams monitoring exploitation activity
Response plan
What I would do
- Confirm whether Multiple Vigor Routers, Vigor2960 Firmware, Vigor300b Firmware +1 more is present in the environment.
- Identify affected versions and establish whether vulnerable services are exposed or reachable.
- Vendor advisory from www.draytek.com
- Review relevant security telemetry for evidence of attempted or successful exploitation.
- Document the remediation decision and track it to verified completion.
Treatment intelligence
Remediation intelligence
Vendor sources are listed before government and third-party guidance. Confirm product applicability and change prerequisites before deployment.
Verification noteAutomated link verification has not completed for this guidance yet.
Technical details
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- CWE
- CWE-78
- Affected versions
- Draytek Multiple Vigor Routers; Draytek Vigor2960 Firmware (End Excluding 1.5.1); Draytek Vigor300b Firmware (End Excluding 1.5.1); Draytek Vigor3900 Firmware (End Excluding 1.5.1)
- Fixed versions
- Draytek Vigor2960 Firmware (Fixed from 1.5.1); Draytek Vigor300b Firmware (Fixed from 1.5.1); Draytek Vigor3900 Firmware (Fixed from 1.5.1)
- Published
- 30 June 2020
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
Signal timeline
- CVE published
- Added to CISA KEV
- Latest EPSS score: 84.6%
- Signal calculated at 83