CVE-2020-15415
CriticalExploitedPublic exploitOn 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.
Published Jun 30, 2020 · Updated Nov 7, 2025
Key Facts
Patch immediately- CVE-2020-15415 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Vigor2960 Firmware (Draytek), Vigor300b Firmware (Draytek), Vigor3900 Firmware (Draytek).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 15, 2023. Public exploit code is available.
- EPSS estimates a 84% probability of exploitation in the next 30 days.
- Fixed versions are available, including Vigor2960 Firmware 1.5.1, Vigor300b Firmware 1.5.1, Vigor3900 Firmware 1.5.1.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
9.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
84%
Higher than 99.7% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
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Description
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Sep 30, 2024 | Oct 21, 2024 | Not reported |
| Industry KEV feed | Feb 15, 2023 | Oct 21, 2024 | Not reported |
| CIRCL KEV | Feb 1, 2024 | Oct 21, 2024 | Not reported |
| ENISA EUVD | Sep 30, 2024 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Affected Products
3 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Vigor2960 FirmwareDraytek | See advisory | 1.5.1 |
| Vigor300b FirmwareDraytek | See advisory | 1.5.1 |
| Vigor3900 FirmwareDraytek | See advisory | 1.5.1 |
Patched Releases
Vigor2960 Firmware
1.5.1
Vigor300b Firmware
1.5.1
Vigor3900 Firmware
1.5.1
Timeline
Publicly disclosed
Jun 30, 2020
Added to Industry KEV feed
Feb 15, 2023
Added to CIRCL KEV
Feb 1, 2024
Added to CISA KEV
Sep 30, 2024
Added to ENISA EUVD
Sep 30, 2024
Last updated
Nov 7, 2025
Weakness Type
- CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- advisoryhttps://www.draytek.com/about/security-advisory
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Vigor2960 Firmware (Draytek); Vigor300b Firmware (Draytek); Vigor3900 Firmware (Draytek). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Feb 15, 2023.
Yes. It was added on Sep 30, 2024 with a federal remediation due date of Oct 21, 2024.
Public exploit code is available.
Fixed versions are available, including Vigor2960 Firmware 1.5.1, Vigor300b Firmware 1.5.1, Vigor3900 Firmware 1.5.1.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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