GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2019-20391 (GCVE-0-2019-20391)

Vulnerability from cvelistv5 – Published: 2020-01-22 00:00 – Updated: 2024-08-05 02:39
VLAI
Summary
An invalid memory access flaw is present in libyang before v1.0-r3 in the function resolve_feature_value() when an if-feature statement is used inside a bit. Applications that use libyang to parse untrusted input yang files may crash.
CWE
  • n/a
Show details on NVD website

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T02:39:09.273Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/CESNET/libyang/commit/bdb596ddc07596fa212f231135b87d0b9178f6f8"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/CESNET/libyang/issues/772"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1793934"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3"
          },
          {
            "name": "[debian-lts-announce] 20230919 [SECURITY] [DLA 3572-1] libyang security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An invalid memory access flaw is present in libyang before v1.0-r3 in the function resolve_feature_value() when an if-feature statement is used inside a bit. Applications that use libyang to parse untrusted input yang files may crash."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-09-19T21:06:18.308Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "url": "https://github.com/CESNET/libyang/commit/bdb596ddc07596fa212f231135b87d0b9178f6f8"
        },
        {
          "url": "https://github.com/CESNET/libyang/issues/772"
        },
        {
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1793934"
        },
        {
          "url": "https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3"
        },
        {
          "name": "[debian-lts-announce] 20230919 [SECURITY] [DLA 3572-1] libyang security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2019-20391",
    "datePublished": "2020-01-22T00:00:00.000Z",
    "dateReserved": "2020-01-22T00:00:00.000Z",
    "dateUpdated": "2024-08-05T02:39:09.273Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2019-20391",
      "date": "2026-09-15",
      "epss": "0.01859",
      "percentile": "0.78082"
    },
    "fkie_nvd": {
      "configurations": "[{\"nodes\": [{\"operator\": \"OR\", \"negate\": false, \"cpeMatch\": [{\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.11:r1:*:*:*:*:*:*\", \"matchCriteriaId\": \"65E91322-5F67-43C2-8112-5ECAEC2A3C12\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.11:r2:*:*:*:*:*:*\", \"matchCriteriaId\": \"80A88DE4-93F8-40C3-AA52-A5F353F028AA\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.12:r1:*:*:*:*:*:*\", \"matchCriteriaId\": \"05C120CA-50EF-4B6D-92C9-ED736219DB07\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.12:r2:*:*:*:*:*:*\", \"matchCriteriaId\": \"99D1FA55-3F56-4E09-B41E-B05C199B96B8\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.13:r1:*:*:*:*:*:*\", \"matchCriteriaId\": \"35D48EC4-58D2-49C6-8049-920787733587\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.13:r2:*:*:*:*:*:*\", \"matchCriteriaId\": \"B57F3953-49D6-413C-A4AE-03125935FC77\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.14:r1:*:*:*:*:*:*\", \"matchCriteriaId\": \"DD62411F-A524-4E80-B540-780EA39CB6A4\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.15:r1:*:*:*:*:*:*\", \"matchCriteriaId\": \"FEF091B1-978A-4881-B1FC-6848CD1A7BBF\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.16:r1:*:*:*:*:*:*\", \"matchCriteriaId\": \"0C50D690-9A4D-4B78-BF4E-A4D9B4074216\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.16:r2:*:*:*:*:*:*\", \"matchCriteriaId\": \"124A5D30-7451-4516-9AA2-963AE62DD679\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:0.16:r3:*:*:*:*:*:*\", \"matchCriteriaId\": \"C260D13B-82E9-4596-9116-61073B42D661\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:1.0:r1:*:*:*:*:*:*\", \"matchCriteriaId\": \"5F8D5FC0-959E-4014-9CB7-91378CC8B2BA\"}, {\"vulnerable\": true, \"criteria\": \"cpe:2.3:a:cesnet:libyang:1.0:r2:*:*:*:*:*:*\", \"matchCriteriaId\": \"DCBDA519-805B-4193-8092-75E2748A7BC3\"}]}]}]",
      "descriptions": "[{\"lang\": \"en\", \"value\": \"An invalid memory access flaw is present in libyang before v1.0-r3 in the function resolve_feature_value() when an if-feature statement is used inside a bit. Applications that use libyang to parse untrusted input yang files may crash.\"}, {\"lang\": \"es\", \"value\": \"Un fallo de acceso a memoria no v\\u00e1lida est\\u00e1 presente en libyang versiones anteriores a v1.0-r3, en la funci\\u00f3n resolve_feature_value() cuando es usada una sentencia if-feature dentro de un bit. Las aplicaciones que usan libyang para analizar archivos de entrada yang no confiables pueden bloquearse.\"}]",
      "id": "CVE-2019-20391",
      "lastModified": "2024-11-21T04:38:22.420",
      "metrics": "{\"cvssMetricV31\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\", \"baseScore\": 6.5, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"REQUIRED\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"HIGH\"}, \"exploitabilityScore\": 2.8, \"impactScore\": 3.6}], \"cvssMetricV2\": [{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"cvssData\": {\"version\": \"2.0\", \"vectorString\": \"AV:N/AC:M/Au:N/C:N/I:N/A:P\", \"baseScore\": 4.3, \"accessVector\": \"NETWORK\", \"accessComplexity\": \"MEDIUM\", \"authentication\": \"NONE\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"NONE\", \"availabilityImpact\": \"PARTIAL\"}, \"baseSeverity\": \"MEDIUM\", \"exploitabilityScore\": 8.6, \"impactScore\": 2.9, \"acInsufInfo\": false, \"obtainAllPrivilege\": false, \"obtainUserPrivilege\": false, \"obtainOtherPrivilege\": false, \"userInteractionRequired\": true}]}",
      "published": "2020-01-22T22:15:10.080",
      "references": "[{\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=1793934\", \"source\": \"cve@mitre.org\", \"tags\": [\"Issue Tracking\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/CESNET/libyang/commit/bdb596ddc07596fa212f231135b87d0b9178f6f8\", \"source\": \"cve@mitre.org\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3\", \"source\": \"cve@mitre.org\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://github.com/CESNET/libyang/issues/772\", \"source\": \"cve@mitre.org\", \"tags\": [\"Exploit\", \"Third Party Advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html\", \"source\": \"cve@mitre.org\"}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=1793934\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Issue Tracking\", \"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/CESNET/libyang/commit/bdb596ddc07596fa212f231135b87d0b9178f6f8\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Patch\", \"Third Party Advisory\"]}, {\"url\": \"https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Third Party Advisory\"]}, {\"url\": \"https://github.com/CESNET/libyang/issues/772\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\", \"tags\": [\"Exploit\", \"Third Party Advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html\", \"source\": \"af854a3a-2127-422b-91ae-364da2661108\"}]",
      "sourceIdentifier": "cve@mitre.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-119\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2019-20391\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2020-01-22T22:15:10.080\",\"lastModified\":\"2024-11-21T04:38:22.420\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"An invalid memory access flaw is present in libyang before v1.0-r3 in the function resolve_feature_value() when an if-feature statement is used inside a bit. Applications that use libyang to parse untrusted input yang files may crash.\"},{\"lang\":\"es\",\"value\":\"Un fallo de acceso a memoria no v\u00e1lida est\u00e1 presente en libyang versiones anteriores a v1.0-r3, en la funci\u00f3n resolve_feature_value() cuando es usada una sentencia if-feature dentro de un bit. Las aplicaciones que usan libyang para analizar archivos de entrada yang no confiables pueden bloquearse.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H\",\"baseScore\":6.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"REQUIRED\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:N/C:N/I:N/A:P\",\"baseScore\":4.3,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":8.6,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":true}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-119\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.11:r1:*:*:*:*:*:*\",\"matchCriteriaId\":\"65E91322-5F67-43C2-8112-5ECAEC2A3C12\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.11:r2:*:*:*:*:*:*\",\"matchCriteriaId\":\"80A88DE4-93F8-40C3-AA52-A5F353F028AA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.12:r1:*:*:*:*:*:*\",\"matchCriteriaId\":\"05C120CA-50EF-4B6D-92C9-ED736219DB07\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.12:r2:*:*:*:*:*:*\",\"matchCriteriaId\":\"99D1FA55-3F56-4E09-B41E-B05C199B96B8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.13:r1:*:*:*:*:*:*\",\"matchCriteriaId\":\"35D48EC4-58D2-49C6-8049-920787733587\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.13:r2:*:*:*:*:*:*\",\"matchCriteriaId\":\"B57F3953-49D6-413C-A4AE-03125935FC77\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.14:r1:*:*:*:*:*:*\",\"matchCriteriaId\":\"DD62411F-A524-4E80-B540-780EA39CB6A4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.15:r1:*:*:*:*:*:*\",\"matchCriteriaId\":\"FEF091B1-978A-4881-B1FC-6848CD1A7BBF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.16:r1:*:*:*:*:*:*\",\"matchCriteriaId\":\"0C50D690-9A4D-4B78-BF4E-A4D9B4074216\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.16:r2:*:*:*:*:*:*\",\"matchCriteriaId\":\"124A5D30-7451-4516-9AA2-963AE62DD679\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:0.16:r3:*:*:*:*:*:*\",\"matchCriteriaId\":\"C260D13B-82E9-4596-9116-61073B42D661\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:1.0:r1:*:*:*:*:*:*\",\"matchCriteriaId\":\"5F8D5FC0-959E-4014-9CB7-91378CC8B2BA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:cesnet:libyang:1.0:r2:*:*:*:*:*:*\",\"matchCriteriaId\":\"DCBDA519-805B-4193-8092-75E2748A7BC3\"}]}]}],\"references\":[{\"url\":\"https://bugzilla.redhat.com/show_bug.cgi?id=1793934\",\"source\":\"cve@mitre.org\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/CESNET/libyang/commit/bdb596ddc07596fa212f231135b87d0b9178f6f8\",\"source\":\"cve@mitre.org\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3\",\"source\":\"cve@mitre.org\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://github.com/CESNET/libyang/issues/772\",\"source\":\"cve@mitre.org\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://bugzilla.redhat.com/show_bug.cgi?id=1793934\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Issue Tracking\",\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/CESNET/libyang/commit/bdb596ddc07596fa212f231135b87d0b9178f6f8\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://github.com/CESNET/libyang/compare/v1.0-r2...v1.0-r3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://github.com/CESNET/libyang/issues/772\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Exploit\",\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2023/09/msg00019.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2025-11-21T16:07:06+00:00",
      "cve": "CVE-2019-20391",
      "id": "CVE-2019-20391",
      "initial_release_date": "2019-04-26T00:00:00+00:00",
      "product_status:fixed": "26",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "libyang: invalid memory access in resolve_feature_value() when a if-feature is used inside a bit",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2019/cve-2019-20391.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-27T06:02:31Z",
      "cve": "CVE-2019-20391",
      "id": "CVE-2019-20391",
      "initial_release_date": "2023-02-15T04:05:23Z",
      "product_status:recommended": "1",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2019-20391",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2019-20391.json",
      "version": "8"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

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.

Loading…

Detection rules are retrieved from Rulezet.

Loading…

Loading…

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.


Loading…