Vulnerability-Lookup

CVE-2021-27836 (GCVE-0-2021-27836)

Vulnerability from cvelistv5 – Published: 2021-11-03 16:07 – Updated: 2024-08-03 21:33

Summary

An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CWE

Assigner

mitre mitre root

References

4 references

URL	Tags
https://github.com/libxls/libxls/issues/94	x_refsource_MISC
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA

Show details on NVD website

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    "redhat_vex": {
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      "id": "CVE-2021-27836",
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      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "libxls: a denial of service via a crafted XLS file",
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      "version": "3"
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      "cve": "CVE-2021-27836",
      "id": "CVE-2021-27836",
      "initial_release_date": "2023-02-15T03:44:23Z",
      "product_status:recommended": "15",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-27836",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-27836.json",
      "version": "6"
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}

CNVD-2021-102419

Vulnerability from cnvd - Published: 2021-12-27

Title

libxls空指针解引用漏洞

Description

libxls是一个可以读取Excel（xls）文件的C库。 libxls 1.6.2版中的xls.c中的xls_getWorkSheet函数存在空指针解引用漏洞。攻击者可通过特制XLS文件利用该漏洞导致拒绝服务。

Severity

中

Patch Name

libxls空指针解引用漏洞的补丁

Patch Description

libxls是一个可以读取Excel（xls）文件的C库。 libxls 1.6.2版中的xls.c中的xls_getWorkSheet函数存在空指针解引用漏洞。攻击者可通过特制XLS文件利用该漏洞导致拒绝服务。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/libxls/libxls/pull/95/commits

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-27836

Impacted products

Name
libxls libxls 1.6.2

Show details on source website

JSON

To clipboard

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  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-27836",
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  "number": "CNVD-2021-102419",
  "openTime": "2021-12-27",
  "patchDescription": "libxls\u662f\u4e00\u4e2a\u53ef\u4ee5\u8bfb\u53d6Excel\uff08xls\uff09\u6587\u4ef6\u7684C\u5e93\u3002\r\n\r\nlibxls 1.6.2\u7248\u4e2d\u7684xls.c\u4e2d\u7684xls_getWorkSheet\u51fd\u6570\u5b58\u5728\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e\u3002\u653b\u51fb\u8005\u53ef\u901a\u8fc7\u7279\u5236XLS\u6587\u4ef6\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "libxls\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "libxls libxls 1.6.2"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-27836",
  "serverity": "\u4e2d",
  "submitTime": "2021-11-04",
  "title": "libxls\u7a7a\u6307\u9488\u89e3\u5f15\u7528\u6f0f\u6d1e"
}

FKIE_CVE-2021-27836

Vulnerability from fkie_nvd - Published: 2021-11-03 17:15 - Updated: 2026-06-17 03:45

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Summary

An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.

References

URL	Tags
cve@mitre.org	https://github.com/libxls/libxls/issues/94	Patch, Third Party Advisory
cve@mitre.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5D7XXCVFYRRMI4ENXYSD3MZEBS6SMI7E/
cve@mitre.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SFOE4Z6T46LA47VXWUVET4ELXRZQ3BWB/
cve@mitre.org	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y6XOTFEOCHYKZAFCB6H3KNIIFJ3UFV7V/
af854a3a-2127-422b-91ae-364da2661108	https://github.com/libxls/libxls/issues/94	Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5D7XXCVFYRRMI4ENXYSD3MZEBS6SMI7E/
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SFOE4Z6T46LA47VXWUVET4ELXRZQ3BWB/
af854a3a-2127-422b-91ae-364da2661108	https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y6XOTFEOCHYKZAFCB6H3KNIIFJ3UFV7V/

Impacted products

Vendor	Product	Version
libxls_project	libxls	1.6.2
fedoraproject	fedora	33
fedoraproject	fedora	34
fedoraproject	fedora	35

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "cve@mitre.org"
    }
  ],
  "configurations": [
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema en la funci\u00f3n xls_getWorkSheet en el archivo xls.c en libxls 1.6.2, que permite a atacantes causar una denegaci\u00f3n de servicio, por medio de un archivo XLS dise\u00f1ado"
    }
  ],
  "id": "CVE-2021-27836",
  "lastModified": "2026-06-17T03:45:30.320",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "MEDIUM",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 4.3,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.6,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-11-03T17:15:08.337",
  "references": [
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      "source": "cve@mitre.org",
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    },
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    },
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    },
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    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

GHSA-GVJP-HXQQ-9FC2

Vulnerability from github – Published: 2022-05-24 19:19 – Updated: 2022-05-24 19:19

Details

An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2021-27836"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2021-11-03T17:15:00Z",
    "severity": "MODERATE"
  },
  "details": "An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.",
  "id": "GHSA-gvjp-hxqq-9fc2",
  "modified": "2022-05-24T19:19:33Z",
  "published": "2022-05-24T19:19:33Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27836"
    },
    {
      "type": "WEB",
      "url": "https://github.com/libxls/libxls/issues/94"
    },
    {
      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5D7XXCVFYRRMI4ENXYSD3MZEBS6SMI7E"
    },
    {
      "type": "WEB",
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    },
    {
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    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

GSD-2021-27836

Vulnerability from gsd - Updated: 2023-12-13 01:23

Details

An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.

Aliases

CVE-2021-27836

Aliases

CVE-2021-27836

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2021-27836",
    "description": "An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.",
    "id": "GSD-2021-27836",
    "references": [
      "https://www.suse.com/security/cve/CVE-2021-27836.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-27836"
      ],
      "details": "An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.",
      "id": "GSD-2021-27836",
      "modified": "2023-12-13T01:23:35.678543Z",
      "schema_version": "1.4.0"
    }
  },
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      },
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          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
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            "baseScore": 4.3,
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            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
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            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
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          },
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          "impactScore": 3.6
        }
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    }
  }
}

OPENSUSE-SU-2022:0142-1

Vulnerability from csaf_opensuse - Published: 2022-05-21 14:01 - Updated: 2022-05-21 14:01

Summary

Security update for libxls

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-27836.

CVE-2021-27836

6.5 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Recommended: 30 products

Open the full advisory

OPENSUSE-SU-2024:12084-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2024-06-15 00:00

Summary

libxls-devel-1.6.2-3.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2021-27836.

CVE-2021-27836

6.5 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Recommended: 12 products

Open the full advisory

ubuntu-cve-2021-27836

Vulnerability from osv_ubuntu

Published

2021-11-03 17:15

Modified

2026-05-20 14:53

Summary

Details

An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.

Severity

6.5 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-27836	REPORT
	https://github.com/libxls/libxls/issues/94	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-27836	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "r-cran-readxl",
            "binary_version": "0.1.0-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "r-cran-readxl",
        "purl": "pkg:deb/ubuntu/r-cran-readxl@0.1.0-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.1.0-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "r-cran-readxl",
            "binary_version": "1.0.0-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "r-cran-readxl",
        "purl": "pkg:deb/ubuntu/r-cran-readxl@1.0.0-2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.0-1build1",
        "1.0.0-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "r-cran-readxl",
            "binary_version": "1.3.1-2build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "r-cran-readxl",
        "purl": "pkg:deb/ubuntu/r-cran-readxl@1.3.1-2build1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.1-2",
        "1.3.1-2build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "r-cran-readxl",
            "binary_version": "1.3.1-2build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "r-cran-readxl",
        "purl": "pkg:deb/ubuntu/r-cran-readxl@1.3.1-2build2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.3.1-2build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "r-cran-readxl",
            "binary_version": "1.4.3-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "r-cran-readxl",
        "purl": "pkg:deb/ubuntu/r-cran-readxl@1.4.3-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.3-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "r-cran-readxl",
            "binary_version": "1.4.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "r-cran-readxl",
        "purl": "pkg:deb/ubuntu/r-cran-readxl@1.4.5-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.5-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "r-cran-readxl",
            "binary_version": "1.4.5-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "r-cran-readxl",
        "purl": "pkg:deb/ubuntu/r-cran-readxl@1.4.5-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.5-1"
      ]
    }
  ],
  "aliases": [],
  "details": "An issue was discoverered in in function xls_getWorkSheet in xls.c in libxls 1.6.2, allows attackers to cause a denial of service, via a crafted XLS file.",
  "id": "UBUNTU-CVE-2021-27836",
  "modified": "2026-05-20T14:53:12Z",
  "published": "2021-11-03T17:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-27836"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/libxls/libxls/issues/94"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-27836"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-27836"
  ]
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

CVE-2021-27836 (GCVE-0-2021-27836)

CNVD-2021-102419

FKIE_CVE-2021-27836

GHSA-GVJP-HXQQ-9FC2

GSD-2021-27836

OPENSUSE-SU-2022:0142-1

OPENSUSE-SU-2024:12084-1

ubuntu-cve-2021-27836

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature

Related by attack behaviour