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CVE-2021-35331

Status: ModifiedHigh (7.8)—

In Tcl 8.6.11, a format string vulnerability in nmakehlp.c might allow code execution via a crafted file. NOTE: multiple third parties dispute the significance of this finding

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

TCL — TCL

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-35331",
  "cveTags": [
    {
      "tags": [
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  "metrics": {
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          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
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        "obtainAllPrivilege": false,
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        "userInteractionRequired": true
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    "cvssMetricV31": [
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  "affected": [
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  "published": "2021-07-05T15:15:07.997",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-134"
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      "lang": "en",
      "value": "In Tcl 8.6.11, a format string vulnerability in nmakehlp.c might allow code execution via a crafted file. NOTE: multiple third parties dispute the significance of this finding"
    },
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      "value": "** EN DISPUTA ** En Tcl versión 8.6.11, una vulnerabilidad de cadena de formato en nmakehlp.c podría permitir la ejecución de código a través de un archivo manipulado. NOTA: varios terceros discuten la importancia de este hallazgo."
    }
  ],
  "lastModified": "2026-06-17T03:57:26.750",
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