CVE-2020-14993

Name: CVE-2020-14993
Creator: NVD / NIST
Published: 2020-06-23T12:15:13.503+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 5.33%

Last modified Jun 17, 2026

CVE-2020-14993 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 5.33% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

5.33%

91.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Draytek	Vigor300b Firmware	< 1.5.1.1
Draytek	Vigor2960 Firmware	< 1.5.1.1
Draytek	Vigor3900 Firmware	< 1.5.1.1

References

https://github.com/dexterone/Vigor-pocExploit, Third Party Advisory
https://www.draytek.com/about/security-advisoryVendor Advisory
https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-stack-based-buffer-overflow-vulnerability-%28cve-2020-14473%29
https://github.com/dexterone/Vigor-pocExploit, Third Party Advisory
https://www.draytek.com/about/security-advisoryVendor Advisory
https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-stack-based-buffer-overflow-vulnerability-%28cve-2020-14473%29

Timeline

Published: Jun 23, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-14993?

How severe is CVE-2020-14993?

CVE-2020-14993 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 5.33% probability of exploitation in the next 30 days.

How do I fix CVE-2020-14993?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-14993?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST