FKIE_CVE-2025-1942

Vulnerability from fkie_nvd - Published: 2025-03-04 14:15 - Updated: 2026-04-13 15:16
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string. This vulnerability was fixed in Firefox 136 and Thunderbird 136.
References
security@mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1947139Issue Tracking
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2025-14/Vendor Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2025-17/Vendor Advisory
Impacted products
Vendor Product Version
mozilla firefox *
mozilla thunderbird *
To clipboard 

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    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7DB4CDD0-EC54-43D0-ACB2-F159ABA53D2C",
              "versionEndExcluding": "136.0",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "43A02EBD-58CF-4057-A3D7-3828B599D954",
              "versionEndExcluding": "136.0",
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            }
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          "operator": "OR"
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string. This vulnerability was fixed in Firefox 136 and Thunderbird 136."
    },
    {
      "lang": "es",
      "value": "Cuando String.toUpperCase() hac\u00eda que una cadena se hiciera m\u00e1s larga, era posible que la memoria no inicializada se incorporara a la cadena de resultado. Esta vulnerabilidad afecta a Firefox \u0026lt; 136 y Thunderbird \u0026lt; 136."
    }
  ],
  "id": "CVE-2025-1942",
  "lastModified": "2026-04-13T15:16:53.940",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2025-03-04T14:15:39.167",
  "references": [
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      "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1947139"
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      "url": "https://www.mozilla.org/security/advisories/mfsa2025-17/"
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  "sourceIdentifier": "security@mozilla.org",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-908"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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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.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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