Vulnerability · Published Feb 5, 2026 · Assigned by VulnCheck
CVE-2020-37121CODE::BLOCKS 16.01 - Buffer Overflow (SEH) UNICODE
Medium 5.5
In plain English
A medium-severity stack buffer overflow in Code::Blocks from Code::Blocks. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 16% of all known vulnerabilities).
Severity (CVSS 3.1)5.5Medium
Exploit odds (30 days)0.2%top 84.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | codeblocks | no fix listed | DEBIAN-CVE-2020-37121 |
| Debian:13 | codeblocks | no fix listed | DEBIAN-CVE-2020-37121 |
| Debian:14 | codeblocks | no fix listed | DEBIAN-CVE-2020-37121 |
| Ubuntu:22.04:LTS | codeblocks | no fix listed | UBUNTU-CVE-2020-37121 |
| Ubuntu:24.04:LTS | codeblocks | no fix listed | UBUNTU-CVE-2020-37121 |
| Ubuntu:25.10 | codeblocks | no fix listed | UBUNTU-CVE-2020-37121 |
| Ubuntu:26.04:LTS | codeblocks | no fix listed | UBUNTU-CVE-2020-37121 |
| Ubuntu:26.10 | codeblocks | no fix listed | UBUNTU-CVE-2020-37121 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Code::Blocks | Code::Blocks | 16.01 |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
References
- ExploitDB-48344 exploit
- CODE::BLOCKS SourceForge Repository product
- VulnCheck Advisory: CODE::BLOCKS 16.01 - Buffer Overflow (SEH) UNICODE third-party-advisory
- VulnCheck Advisory: CODE::BLOCKS 16.01 - Buffer Overflow (SEH) UNICODE third-party-advisory