CVE-2021-21971 Memory corruption in Sealevel
An attacker can trigger an out-of-bounds write in the URL decoder via a crafted MQTT payload, potentially leading to code execution on the device.
- 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-2021-21971?
CVE-2021-21971 is a low-severity memory corruption vulnerability in Sealevel, published on 4 Feb 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An out-of-bounds write vulnerability exists in the URL_decode functionality of Sealevel Systems, Inc. SeaConnect 370W v1.3.34. A specially-crafted MQTT payload can lead to an out-of-bounds write. An attacker can perform a man-in-the-middle attack to trigger this vulnerability.
Weakness: CWE-787
Which versions are affected by CVE-2021-21971?
It affects 1 product.
Products include Sealevel Seaconnect 370w Firmware.
How do I fix CVE-2021-21971?
No fix has been published for CVE-2021-21971 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-2021-21971 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2021-21971 exists.
Other vulnerabilities in Sealevel
Sources
Also known as GHSA-3975-hvrj-7hm8.