CODE::BLOCKS 16.01 - Buffer Overflow (SEH) UNICODE
Priority MEDIUM 63CWE-121Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- Active
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.
Summary
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.
Why it matters now
Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00244 15th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- Poc
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Code::Blocks | Code::Blocks | 16.01 | — | No fix listed | CNA |
- Code::Blocks VendorCode::Blocks Affected 16.01 Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2020-37121
- 2026-10-03 Alias added: GHSA-77vf-q3xf-37g8
References
More Code::Blocks vulnerabilities
- TI-2020-19175 Code Blocks 17.12 - 'File Name' Local Buffer Overflow CVSS 4.0HIGH 8.4
- TI-2020-19173 Code Blocks 20.03 - Denial Of Service CVSS 4.0MEDIUM 4.6
- TI-2020-08703 A buffer overflow vulnerability in Code::Blocks 17.12 allows an attacker to execute… CVSS 3.1MEDIUM 5.5
Sources
- CVE-2020-37121 · CVE Program
- CVE-2020-37121 · NVD
- FIRST EPSS
- GHSA-77vf-q3xf-37g8 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-37121 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences