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FKIE_CVE-2019-20454

Vulnerability from fkie_nvd - Published: 2020-02-14 14:15 - Updated: 2026-06-17 02:30
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
An out-of-bounds read was discovered in PCRE before 10.34 when the pattern \X is JIT compiled and used to match specially crafted subjects in non-UTF mode. Applications that use PCRE to parse untrusted input may be vulnerable to this flaw, which would allow an attacker to crash the application. The flaw occurs in do_extuni_no_utf in pcre2_jit_compile.c.
References
cve@mitre.orghttps://bugs.exim.org/show_bug.cgi?id=2421Issue Tracking, Permissions Required, Third Party Advisory
cve@mitre.orghttps://bugs.php.net/bug.php?id=78338Exploit, Issue Tracking, Third Party Advisory
cve@mitre.orghttps://bugzilla.redhat.com/show_bug.cgi?id=1735494Issue Tracking, Patch, Third Party Advisory
cve@mitre.orghttps://lists.debian.org/debian-lts-announce/2023/03/msg00014.htmlMailing List, Third Party Advisory
cve@mitre.orghttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OQRAHYHLRNMBTPR3KXVM27NSZP3KTOPI/Mailing List, Third Party Advisory
cve@mitre.orghttps://security.gentoo.org/glsa/202006-16Third Party Advisory
cve@mitre.orghttps://vcs.pcre.org/pcre2?view=revision&revision=1092Broken Link, Patch
af854a3a-2127-422b-91ae-364da2661108https://bugs.exim.org/show_bug.cgi?id=2421Issue Tracking, Permissions Required, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugs.php.net/bug.php?id=78338Exploit, Issue Tracking, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.redhat.com/show_bug.cgi?id=1735494Issue Tracking, Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2023/03/msg00014.htmlMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OQRAHYHLRNMBTPR3KXVM27NSZP3KTOPI/Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202006-16Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://vcs.pcre.org/pcre2?view=revision&revision=1092Broken Link, Patch
Impacted products
Vendor Product Version
pcre pcre2 *
fedoraproject fedora 31
splunk universal_forwarder *
splunk universal_forwarder *
splunk universal_forwarder 9.1.0
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:pcre:pcre2:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "74DDD7EA-B855-4B1E-BFEA-27D65C2483FE",
              "versionEndExcluding": "10.34",
              "versionStartIncluding": "10.31",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
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              "criteria": "cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*",
              "matchCriteriaId": "80F0FA5D-8D3B-4C0E-81E2-87998286AF33",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    },
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5722E753-75DE-4944-A11B-556CB299B57D",
              "versionEndExcluding": "8.2.12",
              "versionStartIncluding": "8.2.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:splunk:universal_forwarder:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DC0F9351-81A4-4FEA-B6B5-6E960A933D32",
              "versionEndExcluding": "9.0.6",
              "versionStartIncluding": "9.0.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:splunk:universal_forwarder:9.1.0:*:*:*:*:*:*:*",
              "matchCriteriaId": "EED24E67-2957-4C1B-8FEA-E2D2FE7B97FC",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An out-of-bounds read was discovered in PCRE before 10.34 when the pattern \\X is JIT compiled and used to match specially crafted subjects in non-UTF mode. Applications that use PCRE to parse untrusted input may be vulnerable to this flaw, which would allow an attacker to crash the application. The flaw occurs in do_extuni_no_utf in pcre2_jit_compile.c."
    },
    {
      "lang": "es",
      "value": "Se detect\u00f3 una lectura fuera de l\u00edmites en PCRE versiones anteriores a 10.34, cuando el patr\u00f3n \\X es compilado en JIT y usado para hacer coincidir temas especialmente dise\u00f1ados en modo no UTF. Las aplicaciones que utilizan PCRE para analizar entradas no confiables pueden ser vulnerables a este fallo, lo que permitir\u00eda a un atacante bloquear la aplicaci\u00f3n. El fallo ocurre en la funci\u00f3n do_extuni_no_utf en el archivo pcre2_jit_compile.c."
    }
  ],
  "id": "CVE-2019-20454",
  "lastModified": "2026-06-17T02:30:28.893",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV30": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.1,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.0"
        },
        "exploitabilityScore": 1.4,
        "impactScore": 3.6,
        "source": "cve@mitre.org",
        "type": "Secondary"
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2020-02-14T14:15:10.593",
  "references": [
    {
      "source": "cve@mitre.org",
      "tags": [
        "Issue Tracking",
        "Permissions Required",
        "Third Party Advisory"
      ],
      "url": "https://bugs.exim.org/show_bug.cgi?id=2421"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
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        "Issue Tracking",
        "Third Party Advisory"
      ],
      "url": "https://bugs.php.net/bug.php?id=78338"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
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      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1735494"
    },
    {
      "source": "cve@mitre.org",
      "tags": [
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      "url": "https://lists.debian.org/debian-lts-announce/2023/03/msg00014.html"
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    {
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      "tags": [
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    {
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      "url": "https://security.gentoo.org/glsa/202006-16"
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    {
      "source": "cve@mitre.org",
      "tags": [
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        "Patch"
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      "url": "https://vcs.pcre.org/pcre2?view=revision\u0026revision=1092"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
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        "Permissions Required",
        "Third Party Advisory"
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      "url": "https://bugs.exim.org/show_bug.cgi?id=2421"
    },
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    },
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      "tags": [
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      "url": "https://vcs.pcre.org/pcre2?view=revision\u0026revision=1092"
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  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-125"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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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

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.


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