FKIE_CVE-2020-12399

Vulnerability from fkie_nvd - Published: 2020-07-09 15:15 - Updated: 2026-06-17 02:51
Severity
4.4 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N
Summary
NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.
References
security@mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=1631576Issue Tracking, Permissions Required, Vendor Advisory
security@mozilla.orghttps://lists.debian.org/debian-lts-announce/2020/09/msg00029.htmlMailing List, Third Party Advisory
security@mozilla.orghttps://security.gentoo.org/glsa/202007-49Third Party Advisory
security@mozilla.orghttps://usn.ubuntu.com/4421-1/Third Party Advisory
security@mozilla.orghttps://www.debian.org/security/2020/dsa-4726Third Party Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2020-20/Vendor Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2020-21/Vendor Advisory
security@mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2020-22/Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.mozilla.org/show_bug.cgi?id=1631576Issue Tracking, Permissions Required, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2020/09/msg00029.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202007-49Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://usn.ubuntu.com/4421-1/Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.debian.org/security/2020/dsa-4726Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.mozilla.org/security/advisories/mfsa2020-20/Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.mozilla.org/security/advisories/mfsa2020-21/Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://www.mozilla.org/security/advisories/mfsa2020-22/Vendor Advisory
Impacted products
Vendor Product Version
mozilla firefox *
mozilla firefox_esr *
mozilla thunderbird *
debian debian_linux 9.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Thunderbird",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "68.9.0",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "77",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Firefox ESR",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThan": "68.9",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "security@mozilla.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "953DA746-3B0F-4926-B859-CA94CD65E4F2",
              "versionEndExcluding": "77.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "7113E7DB-1A88-4F93-AC2E-26DD06078EE4",
              "versionEndExcluding": "68.9.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A5275EC9-3455-4BAE-A71E-13205D5123E6",
              "versionEndExcluding": "68.9.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*",
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              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "NSS has shown timing differences when performing DSA signatures, which was exploitable and could eventually leak private keys. This vulnerability affects Thunderbird \u003c 68.9.0, Firefox \u003c 77, and Firefox ESR \u003c 68.9."
    },
    {
      "lang": "es",
      "value": "NSS ha mostrado diferencias de sincronizaci\u00f3n cuando se llevan a cabo firmas DSA, que fue explotable y eventualmente podr\u00eda filtrar claves privadas. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 68.9.0, Firefox versiones anteriores a 77 y Firefox ESR versiones anteriores a 68.9"
    }
  ],
  "id": "CVE-2020-12399",
  "lastModified": "2026-06-17T02:51:45.670",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "LOW",
        "cvssData": {
          "accessComplexity": "HIGH",
          "accessVector": "LOCAL",
          "authentication": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 1.2,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "NONE",
          "vectorString": "AV:L/AC:H/Au:N/C:P/I:N/A:N",
          "version": "2.0"
        },
        "exploitabilityScore": 1.9,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.4,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N",
          "version": "3.1"
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        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  },
  "published": "2020-07-09T15:15:10.757",
  "references": [
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      "source": "security@mozilla.org",
      "tags": [
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        "Permissions Required",
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    },
    {
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    },
    {
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      ],
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    },
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    },
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    },
    {
      "source": "security@mozilla.org",
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    },
    {
      "source": "security@mozilla.org",
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      ],
      "url": "https://www.mozilla.org/security/advisories/mfsa2020-21/"
    },
    {
      "source": "security@mozilla.org",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.mozilla.org/security/advisories/mfsa2020-22/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking",
        "Permissions Required",
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    },
    {
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    },
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      "tags": [
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    },
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      "source": "af854a3a-2127-422b-91ae-364da2661108",
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    },
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      ],
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    },
    {
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      "url": "https://www.mozilla.org/security/advisories/mfsa2020-20/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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      "url": "https://www.mozilla.org/security/advisories/mfsa2020-21/"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
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      ],
      "url": "https://www.mozilla.org/security/advisories/mfsa2020-22/"
    }
  ],
  "sourceIdentifier": "security@mozilla.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-203"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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