Vulnerability-Lookup

CVE-2020-37121 (GCVE-0-2020-37121)

Vulnerability from cvelistv5 – Published: 2026-02-05 16:13 – Updated: 2026-08-06 21:10

Title

CODE::BLOCKS 16.01 - Buffer Overflow (SEH) UNICODE

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.

Severity

6.7 (Medium)


                        
                          CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-02-06 20:33 UTC

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7165 records in the last 180 days details

References

4 references

URL	Tags
https://nutcrackerssecurity.github.io/posts/windo…	exploit
https://www.codeblocks.org/	product
https://sourceforge.net/projects/codeblocks/	third-party-advisory
https://www.vulncheck.com/advisories/codeblocks-b…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version	CPE status
Code::Blocks	Code::Blocks	Affected: 16.01 cpe:2.3:a:codeblocks:code\\:16.01:::::::*

Date Public

2020-04-17 00:00

Credits

T3jv1l

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2020-37121

Vulnerability from fkie_nvd - Published: 2026-02-05 17:16 - Updated: 2026-08-06 22:16

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	disclosure@vulncheck.com	https://nutcrackerssecurity.github.io/posts/windows-exploit-dev-part-7/
	disclosure@vulncheck.com	https://sourceforge.net/projects/codeblocks/
	disclosure@vulncheck.com	https://www.codeblocks.org/
	disclosure@vulncheck.com	https://www.vulncheck.com/advisories/codeblocks-buffer-overflow-seh-unicode

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.7,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "ACTIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "disclosure@vulncheck.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2020-37121",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-02-06T20:33:50.462724Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-02-05T17:16:06.730",
  "references": [
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://nutcrackerssecurity.github.io/posts/windows-exploit-dev-part-7/"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://sourceforge.net/projects/codeblocks/"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.codeblocks.org/"
    },
    {
      "source": "disclosure@vulncheck.com",
      "url": "https://www.vulncheck.com/advisories/codeblocks-buffer-overflow-seh-unicode"
    }
  ],
  "sourceIdentifier": "disclosure@vulncheck.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-121"
        }
      ],
      "source": "disclosure@vulncheck.com",
      "type": "Secondary"
    }
  ]
}

GHSA-77VF-Q3XF-37G8

Vulnerability from github – Published: 2026-02-05 18:30 – Updated: 2026-08-07 00:31

Details

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 M3U playlist file with 536 bytes of buffer and shellcode to trigger remote code execution.

Severity

9.8 (Critical)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

6.7 (Medium)


                  
                    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2020-37121"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-05T17:16:06Z",
    "severity": "MODERATE"
  },
  "details": "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 M3U playlist file with 536 bytes of buffer and shellcode to trigger remote code execution.",
  "id": "GHSA-77vf-q3xf-37g8",
  "modified": "2026-08-07T00:31:04Z",
  "published": "2026-02-05T18:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-37121"
    },
    {
      "type": "WEB",
      "url": "https://nutcrackerssecurity.github.io/posts/windows-exploit-dev-part-7"
    },
    {
      "type": "WEB",
      "url": "https://sourceforge.net/projects/codeblocks"
    },
    {
      "type": "WEB",
      "url": "https://www.codeblocks.org"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/48344"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/codeblocks-buffer-overflow-seh-unicode"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

UBUNTU-CVE-2020-37121 (CVE-2020-37121)

Vulnerability from osv_ubuntu – Published: 2026-02-05 17:16 – Updated: 2026-10-28 17:09 – Source website

Details

Severity

5.5 (Medium)


                    
                      CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

6.7 (Medium)


                    
                      CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2020-37121	REPORT
	https://www.cve.org/CVERecord?id=CVE-2020-37121	REPORT
	https://www.exploit-db.com/exploits/48344	REPORT
	https://sourceforge.net/projects/codeblocks/	REPORT
	https://www.codeblocks.org/	REPORT
	https://www.vulncheck.com/advisories/codeblocks-b…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "codeblocks",
            "binary_version": "13.12+dfsg-4"
          },
          {
            "binary_name": "codeblocks-common",
            "binary_version": "13.12+dfsg-4"
          },
          {
            "binary_name": "codeblocks-contrib",
            "binary_version": "13.12+dfsg-4"
          },
          {
            "binary_name": "libcodeblocks0",
            "binary_version": "13.12+dfsg-4"
          },
          {
            "binary_name": "libwxsmithlib0",
            "binary_version": "13.12+dfsg-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "codeblocks",
        "purl": "pkg:deb/ubuntu/codeblocks@13.12+dfsg-4?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "13.12-3.1build1",
        "13.12+dfsg-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "codeblocks",
            "binary_version": "16.01+dfsg-2.1"
          },
          {
            "binary_name": "codeblocks-common",
            "binary_version": "16.01+dfsg-2.1"
          },
          {
            "binary_name": "codeblocks-contrib",
            "binary_version": "16.01+dfsg-2.1"
          },
          {
            "binary_name": "libcodeblocks0",
            "binary_version": "16.01+dfsg-2.1"
          },
          {
            "binary_name": "libwxsmithlib0",
            "binary_version": "16.01+dfsg-2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "codeblocks",
        "purl": "pkg:deb/ubuntu/codeblocks@16.01+dfsg-2.1?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "16.01+dfsg-2.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "codeblocks",
            "binary_version": "20.03-3"
          },
          {
            "binary_name": "codeblocks-common",
            "binary_version": "20.03-3"
          },
          {
            "binary_name": "codeblocks-contrib",
            "binary_version": "20.03-3"
          },
          {
            "binary_name": "libcodeblocks0",
            "binary_version": "20.03-3"
          },
          {
            "binary_name": "libwxsmithlib0",
            "binary_version": "20.03-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "codeblocks",
        "purl": "pkg:deb/ubuntu/codeblocks@20.03-3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "16.01+dfsg-2.1",
        "17.12+dfsg-1",
        "17.12+dfsg-1build1",
        "20.03-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "codeblocks",
            "binary_version": "20.03-3.1"
          },
          {
            "binary_name": "codeblocks-common",
            "binary_version": "20.03-3.1"
          },
          {
            "binary_name": "codeblocks-contrib",
            "binary_version": "20.03-3.1"
          },
          {
            "binary_name": "libcodeblocks0",
            "binary_version": "20.03-3.1"
          },
          {
            "binary_name": "libwxsmithlib0",
            "binary_version": "20.03-3.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "codeblocks",
        "purl": "pkg:deb/ubuntu/codeblocks@20.03-3.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.03-3",
        "20.03-3.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "codeblocks",
            "binary_version": "20.03+svn13046-0.3build2"
          },
          {
            "binary_name": "codeblocks-common",
            "binary_version": "20.03+svn13046-0.3build2"
          },
          {
            "binary_name": "codeblocks-contrib",
            "binary_version": "20.03+svn13046-0.3build2"
          },
          {
            "binary_name": "libcodeblocks0t64",
            "binary_version": "20.03+svn13046-0.3build2"
          },
          {
            "binary_name": "libwxsmithlib0t64",
            "binary_version": "20.03+svn13046-0.3build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "codeblocks",
        "purl": "pkg:deb/ubuntu/codeblocks@20.03+svn13046-0.3build2?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.03+svn13046-0.1build1",
        "20.03+svn13046-0.2",
        "20.03+svn13046-0.3build1",
        "20.03+svn13046-0.3build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "codeblocks",
            "binary_version": "25.03+dfsg-2"
          },
          {
            "binary_name": "codeblocks-common",
            "binary_version": "25.03+dfsg-2"
          },
          {
            "binary_name": "codeblocks-contrib",
            "binary_version": "25.03+dfsg-2"
          },
          {
            "binary_name": "libcodeblocks0t64",
            "binary_version": "25.03+dfsg-2"
          },
          {
            "binary_name": "libwxsmithlib0t64",
            "binary_version": "25.03+dfsg-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "codeblocks",
        "purl": "pkg:deb/ubuntu/codeblocks@25.03+dfsg-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "20.03+svn13046-0.4",
        "25.03+dfsg-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "codeblocks",
            "binary_version": "25.03+dfsg-3"
          },
          {
            "binary_name": "codeblocks-common",
            "binary_version": "25.03+dfsg-3"
          },
          {
            "binary_name": "codeblocks-contrib",
            "binary_version": "25.03+dfsg-3"
          },
          {
            "binary_name": "libcodeblocks0t64",
            "binary_version": "25.03+dfsg-3"
          },
          {
            "binary_name": "libwxsmithlib0t64",
            "binary_version": "25.03+dfsg-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "codeblocks",
        "purl": "pkg:deb/ubuntu/codeblocks@25.03+dfsg-3?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "25.03+dfsg-2.1",
        "25.03+dfsg-3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "codeblocks",
            "binary_version": "25.03+dfsg-2.1"
          },
          {
            "binary_name": "codeblocks-common",
            "binary_version": "25.03+dfsg-2.1"
          },
          {
            "binary_name": "codeblocks-contrib",
            "binary_version": "25.03+dfsg-2.1"
          },
          {
            "binary_name": "libcodeblocks0t64",
            "binary_version": "25.03+dfsg-2.1"
          },
          {
            "binary_name": "libwxsmithlib0t64",
            "binary_version": "25.03+dfsg-2.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "codeblocks",
        "purl": "pkg:deb/ubuntu/codeblocks@25.03+dfsg-2.1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "25.03+dfsg-2",
        "25.03+dfsg-2.1"
      ]
    }
  ],
  "aliases": [],
  "details": "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.",
  "id": "UBUNTU-CVE-2020-37121",
  "modified": "2026-10-28T17:09:58Z",
  "published": "2026-02-05T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2020-37121"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2020-37121"
    },
    {
      "type": "REPORT",
      "url": "https://www.exploit-db.com/exploits/48344"
    },
    {
      "type": "REPORT",
      "url": "https://sourceforge.net/projects/codeblocks/"
    },
    {
      "type": "REPORT",
      "url": "https://www.codeblocks.org/"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/codeblocks-buffer-overflow-seh-unicode"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2020-37121"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2020-37121 (GCVE-0-2020-37121)

FKIE_CVE-2020-37121

GHSA-77VF-Q3XF-37G8

UBUNTU-CVE-2020-37121 (CVE-2020-37121)

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Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour