CVE-2020-14993 Memory corruption in n/a

What is CVE-2020-14993?

CVE-2020-14993 is a critical memory corruption vulnerability in n/a, published on 23 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-787

Which versions are affected by CVE-2020-14993?

It affects 3 products.

Products include Draytek Vigor2960 Firmware, Draytek Vigor300b Firmware, Draytek Vigor3900 Firmware.

How do I fix CVE-2020-14993?

No fix has been published for CVE-2020-14993 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-14993 being exploited?

There is no known exploitation of CVE-2020-14993 in the wild and no public exploit code.

Other vulnerabilities in n/a

• CVE-2020-15415 DrayTek Multiple Vigor Routers OS Command Injection Exploited Critical 9.8
• CVE-2020-8515 Multiple DrayTek Vigor Routers Web Management Page Exploited Critical 9.8
• CVE-2024-12987 DrayTek Vigor Routers OS Command Injection Exploited Medium 6.9
• CVE-2021-42911 Other in n/a Critical 9.8
• CVE-2021-43118 Command injection in n/a Critical 9.8

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-56hp-cj87-42wh.