CVE-2021-42374 (GCVE-0-2021-42374)

Vulnerability from cvelistv5 – Published: 2021-11-15 00:00 – Updated: 2025-11-03 20:34
VLAI
Summary
An out-of-bounds heap read in Busybox's unlzma applet leads to information leak and denial of service when crafted LZMA-compressed input is decompressed. This can be triggered by any applet/format that
Severity
5.3 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-23 13:31 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
busybox busybox Affected: unspecified , < 1.34.0 (custom)
guessed Create a notification for this product.
Show details on NVD website
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "busybox: out-of-bounds read in unlzma applet leads to information leak and denial of service when crafted LZMA-compressed input is decompressed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-42374.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2025-11-03T20:34:04.163Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/"
              },
              {
                "name": "FEDORA-2021-5a95823596",
                "tags": [
                  "vendor-advisory",
                  "x_transferred"
                ],
                "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/"
              },
              {
                "name": "FEDORA-2021-c52c0fe490",
                "tags": [
                  "vendor-advisory",
                  "x_transferred"
                ],
                "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://security.netapp.com/advisory/ntap-20211223-0002/"
              },
              {
                "tags": [
                  "x_transferred"
                ],
                "url": "https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog"
              },
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00012.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "HIGH",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 5.3,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "LOW",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2021-42374",
                    "options": [
                      {
                        "Exploitation": "poc"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-04-23T13:31:05.207395Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-05-05T13:17:22.840Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "product": "busybox",
              "vendor": "busybox",
              "versions": [
                {
                  "lessThan": "1.34.0",
                  "status": "affected",
                  "version": "unspecified",
                  "versionType": "custom"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "An out-of-bounds heap read in Busybox\u0027s unlzma applet leads to information leak and denial of service when crafted LZMA-compressed input is decompressed. This can be triggered by any applet/format that"
            }
          ],
          "problemTypes": [
            {
              "descriptions": [
                {
                  "cweId": "CWE-125",
                  "description": "CWE-125",
                  "lang": "en",
                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2023-04-25T00:00:00.000Z",
            "orgId": "48a46f29-ae42-4e1d-90dd-c1676c1e5e6d",
            "shortName": "JFROG"
          },
          "references": [
            {
              "url": "https://jfrog.com/blog/unboxing-busybox-14-new-vulnerabilities-uncovered-by-claroty-and-jfrog/"
            },
            {
              "name": "FEDORA-2021-5a95823596",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQXGOGWBIYWOIVXJVRKHZR34UMEHQBXS/"
            },
            {
              "name": "FEDORA-2021-c52c0fe490",
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6T2TURBYYJGBMQTTN2DSOAIQGP7WCPGV/"
            },
            {
              "url": "https://security.netapp.com/advisory/ntap-20211223-0002/"
            },
            {
              "url": "https://claroty.com/team82/research/unboxing-busybox-14-vulnerabilities-uncovered-by-claroty-jfrog"
            }
          ]
        }
      },
      "cveMetadata": {
        "assignerOrgId": "48a46f29-ae42-4e1d-90dd-c1676c1e5e6d",
        "assignerShortName": "JFROG",
        "cveId": "CVE-2021-42374",
        "datePublished": "2021-11-15T00:00:00.000Z",
        "dateReserved": "2021-10-14T00:00:00.000Z",
        "dateUpdated": "2025-11-03T20:34:04.163Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.



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.