CVE-2020-37121 CODE::BLOCKS 16.01 - Buffer Overflow (SEH) UNICODE
Attackers can execute arbitrary code by tricking users into opening a malicious text file in Code::Blocks, exploiting a buffer overflow.
- 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-2020-37121?
CVE-2020-37121 is a medium-severity memory corruption vulnerability in Code::Blocks, published on 5 Feb 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
CODE::BLOCKS 16.01 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler with crafted Unicode characters. Attackers can create a malicious text file with 1982 bytes of buffer and shellcode to trigger remote code execution.
Weakness: CWE-121
Which versions are affected by CVE-2020-37121?
How do I fix CVE-2020-37121?
No fix has been published for CVE-2020-37121 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-2020-37121 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2020-37121 exists.
Sources
Also known as GHSA-77vf-q3xf-37g8, UBUNTU-CVE-2020-37121.