CVE-2020-6989 Memory corruption in Moxa PT-7528 series firmware, Version 4.0 or lower, PT-7828 series firmware, Version 3.9 or lower

Critical 9.8 Published 24 Mar 2020 Updated 4 Aug 2024

Remote attackers can exploit a buffer overflow in the web server to execute arbitrary code or cause denial of service on Moxa PT-7528 and PT-7828 devices.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-6989?

CVE-2020-6989 is a critical memory corruption vulnerability in Moxa PT-7528 series firmware, Version 4.0 or lower, PT-7828 series firmware, Version 3.9 or lower, published on 24 Mar 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

In Moxa PT-7528 series firmware, Version 4.0 or lower, and PT-7828 series firmware, Version 3.9 or lower, a buffer overflow in the web server allows remote attackers to cause a denial-of-service condition or execute arbitrary code.

Weakness: CWE-787, CWE-121

Which versions are affected by CVE-2020-6989?

It affects 55 products.

Products include Moxa Pt-7528-12msc-12tx-4gsfp-Hv-Hv Firmware, Moxa Pt-7528-12msc-12tx-4gsfp-Hv Firmware, Moxa Pt-7528-12msc-12tx-4gsfp-Wv-Wv Firmware, Moxa Pt-7528-12msc-12tx-4gsfp-Wv Firmware, Moxa Pt-7528-12mst-12tx-4gsfp-Hv-Hv Firmware, Moxa Pt-7528-12mst-12tx-4gsfp-Hv Firmware and 49 more.

How do I fix CVE-2020-6989?

No fix has been published for CVE-2020-6989 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-2020-6989 being exploited?

There is no known exploitation of CVE-2020-6989 in the wild and no public exploit code.

Sources

Also known as GHSA-f3pg-xh2r-fcrw.