A stack-based buffer overflow on DrayTek Vigor2960, Vigor3900, and Vigor300B devices…
Priority MEDIUM 51CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
A stack-based buffer overflow on DrayTek Vigor2960, Vigor3900, and Vigor300B devices before 1.5.1.1 allows remote attackers to execute arbitrary code via the formuserphonenumber parameter in an authusersms action to mainfunction.cgi.
Why it matters now
EPSS 0.05544 92nd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 6
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:draytek:vigor300b_firmware:*:*:*:*:*:*:*:* | before 1.5.1.1 | Vulnerable | DrayTek |
| cpe:2.3:h:draytek:vigor300b:-:*:*:*:*:*:*:* | not specified by NVD | Running on | DrayTek |
| cpe:2.3:o:draytek:vigor2960_firmware:*:*:*:*:*:*:*:* | before 1.5.1.1 | Vulnerable | DrayTek |
| cpe:2.3:h:draytek:vigor2960:-:*:*:*:*:*:*:* | not specified by NVD | Running on | DrayTek |
| cpe:2.3:o:draytek:vigor3900_firmware:*:*:*:*:*:*:*:* | before 1.5.1.1 | Vulnerable | DrayTek |
| cpe:2.3:h:draytek:vigor3900:-:*:*:*:*:*:*:* | not specified by NVD | Running on | DrayTek |
- cpe:2.3:o:draytek:vigor300b_firmware:*:*:*:*:*:*:*:* Versions before 1.5.1.1 Vulnerable ·DrayTek
- cpe:2.3:h:draytek:vigor300b:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·DrayTek
- cpe:2.3:o:draytek:vigor2960_firmware:*:*:*:*:*:*:*:* Versions before 1.5.1.1 Vulnerable ·DrayTek
- cpe:2.3:h:draytek:vigor2960:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·DrayTek
- cpe:2.3:o:draytek:vigor3900_firmware:*:*:*:*:*:*:*:* Versions before 1.5.1.1 Vulnerable ·DrayTek
- cpe:2.3:h:draytek:vigor3900:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·DrayTek
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-14993
- 2026-10-03 Alias added: GHSA-56hp-cj87-42wh
References
More DrayTek Vigor2960 Firmware vulnerabilities
- TI-2020-12150 On DrayTek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1… KEVCVSS 3.1CRITICAL 9.8
- TI-2020-06834 DrayTek Vigor2960 1.3.1_Beta, Vigor3900 1.4.4_Beta, and Vigor300B 1.3.3_Beta… KEVCVSS 3.1CRITICAL 9.8
- TI-2024-12038 DrayTek Vigor2960/Vigor300B Web Management Interface apmcfgupload os command injection KEVCVSS 4.0MEDIUM 6.9
- TI-2020-08715 A stack-based buffer overflow in cvmd on Draytek Vigor3900, Vigor2960, and Vigor300B… CVSS 3.1CRITICAL 9.8
- TI-2020-08714 A stack-based buffer overflow in apmd on Draytek Vigor3900, Vigor2960, and Vigor300B… CVSS 3.1CRITICAL 9.8
- TI-2020-08713 /cgi-bin/activate.cgi on Draytek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2020-14993 · CVE Program
- CVE-2020-14993 · NVD
- FIRST EPSS
- GHSA-56hp-cj87-42wh · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences