CVE-2020-36997 BacklinkSpeed 2.4 - Buffer Overflow PoC (SEH)
Attackers can execute arbitrary code by exploiting a buffer overflow in BacklinkSpeed via a malicious file import.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2020-36997?
CVE-2020-36997 is a high-severity memory corruption vulnerability in Dummysoftware BacklinkSpeed, published on 29 Jan 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
BacklinkSpeed 2.4 contains a buffer overflow vulnerability that allows attackers to corrupt the Structured Exception Handler (SEH) chain through malicious file import. Attackers can craft a specially designed payload file to overwrite SEH addresses, potentially executing arbitrary code and gaining control of the application.
Weakness: CWE-121
Which versions are affected by CVE-2020-36997?
How do I fix CVE-2020-36997?
No fix has been published for CVE-2020-36997 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-2020-36997 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-36997 exists.
Sources
Also known as GHSA-mrjv-54cc-hwh4.