Vulnerability-Lookup

GHSA-VH82-45MM-G28J

Vulnerability from github – Published: 2026-02-05 18:30 – Updated: 2026-02-05 18:30

Details

B64dec 1.1.2 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler (SEH) with crafted input. Attackers can leverage an egg hunter technique and carefully constructed payload to inject and execute malicious code during base64 decoding process.

Severity ?

9.8 (Critical)


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

8.4 (High)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2020-37124"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-121"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-02-05T17:16:07Z",
    "severity": "HIGH"
  },
  "details": "B64dec 1.1.2 contains a buffer overflow vulnerability that allows attackers to execute arbitrary code by overwriting Structured Exception Handler (SEH) with crafted input. Attackers can leverage an egg hunter technique and carefully constructed payload to inject and execute malicious code during base64 decoding process.",
  "id": "GHSA-vh82-45mm-g28j",
  "modified": "2026-02-05T18:30:31Z",
  "published": "2026-02-05T18:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-37124"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/48317"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/bdec-buffer-overflow-seh-overflow-egg-hunter"
    },
    {
      "type": "WEB",
      "url": "http://4mhz.de/b64dec.html"
    }
  ],
  "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:H/VI:H/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"
    }
  ]
}

CVE-2020-37124 (GCVE-0-2020-37124)

Vulnerability from cvelistv5 – Published: 2026-02-05 16:13 – Updated: 2026-02-06 20:34

Title

B64dec 1.1.2 - Buffer Overflow (SEH Overflow + Egg Hunter)

Summary

Severity ?

8.4 (High)


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

9.8 (Critical)


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

CWE

CWE-121 - Stack-based Buffer Overflow

Assigner

VulnCheck

References

URL

Tags

	https://www.exploit-db.com/exploits/48317	exploit
	http://4mhz.de/b64dec.html	product
	https://www.vulncheck.com/advisories/bdec-buffer-…	third-party-advisory

Impacted products

	Vendor	Product	Version
	4Mhz	B64dec	Affected: 1.1.2

Credits

Andy Bowden

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2020-37124",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-06T20:34:45.915079Z",
                "version": "2.0.3"
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          "vendor": "4Mhz",
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            }
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        }
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        }
      ],
      "metrics": [
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          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "attackRequirements": "NONE",
            "attackVector": "LOCAL",
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
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            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
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            "valueDensity": "NOT_DEFINED",
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            "confidentialityImpact": "HIGH",
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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          "tags": [
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          "url": "https://www.exploit-db.com/exploits/48317"
        },
        {
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          "tags": [
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          "url": "http://4mhz.de/b64dec.html"
        },
        {
          "name": "VulnCheck Advisory: B64dec 1.1.2 - Buffer Overflow (SEH Overflow + Egg Hunter)",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://www.vulncheck.com/advisories/bdec-buffer-overflow-seh-overflow-egg-hunter"
        }
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  "cveMetadata": {
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Sightings

Author	Source	Type	Date

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.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-VH82-45MM-G28J

CVE-2020-37124 (GCVE-0-2020-37124)

Tags

Sightings

Nomenclature