Vulnerability-Lookup

OESA-2023-1033 (CVE-2021-33641)

Vulnerability from osv_openeuler – Published: 2023-01-13 11:05 – Updated: 2026-08-06 11:05 – Source website

Summary

byacc security update

Details

Berkeley Yacc is an LALR(1) parser generator. Berkeley Yacc has been made as compatible as possible with AT&T Yacc. Berkeley Yacc can accept any input specification that conforms to the AT&T Yacc documentation. Specifications that take advantage of undocumented features of AT&T Yacc will probably be rejected.

Security Fix(es):

No description is available for this CVE.(CVE-2021-33641)

No description is available for this CVE.(CVE-2021-33642)

Severity

5.5 (Medium)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-33641	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2021-33642	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "aarch64": [
          "byacc-debuginfo-1.9.20200330-2.oe1.aarch64.rpm",
          "byacc-1.9.20200330-2.oe1.aarch64.rpm",
          "byacc-debugsource-1.9.20200330-2.oe1.aarch64.rpm"
        ],
        "noarch": [
          "byacc-help-1.9.20200330-2.oe1.noarch.rpm"
        ],
        "src": [
          "byacc-1.9.20200330-2.oe1.src.rpm"
        ],
        "x86_64": [
          "byacc-1.9.20200330-2.oe1.x86_64.rpm",
          "byacc-debuginfo-1.9.20200330-2.oe1.x86_64.rpm",
          "byacc-debugsource-1.9.20200330-2.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP1",
        "name": "byacc",
        "purl": "pkg:rpm/openEuler/byacc\u0026distro=openEuler-20.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.20200330-2.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "byacc-debuginfo-1.9.20200330-2.oe1.aarch64.rpm",
          "byacc-debugsource-1.9.20200330-2.oe1.aarch64.rpm",
          "byacc-1.9.20200330-2.oe1.aarch64.rpm"
        ],
        "noarch": [
          "byacc-help-1.9.20200330-2.oe1.noarch.rpm"
        ],
        "src": [
          "byacc-1.9.20200330-2.oe1.src.rpm"
        ],
        "x86_64": [
          "byacc-debuginfo-1.9.20200330-2.oe1.x86_64.rpm",
          "byacc-debugsource-1.9.20200330-2.oe1.x86_64.rpm",
          "byacc-1.9.20200330-2.oe1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:20.03-LTS-SP3",
        "name": "byacc",
        "purl": "pkg:rpm/openEuler/byacc\u0026distro=openEuler-20.03-LTS-SP3"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.20200330-2.oe1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "byacc-2.0.20210808-4.oe2203.aarch64.rpm",
          "byacc-debugsource-2.0.20210808-4.oe2203.aarch64.rpm",
          "byacc-debuginfo-2.0.20210808-4.oe2203.aarch64.rpm",
          "byacc-debugsource-2.0.20210808-4.oe2203sp1.aarch64.rpm",
          "byacc-debuginfo-2.0.20210808-4.oe2203sp1.aarch64.rpm",
          "byacc-2.0.20210808-4.oe2203sp1.aarch64.rpm"
        ],
        "noarch": [
          "byacc-help-2.0.20210808-4.oe2203.noarch.rpm",
          "byacc-help-2.0.20210808-4.oe2203sp1.noarch.rpm"
        ],
        "src": [
          "byacc-2.0.20210808-4.oe2203.src.rpm",
          "byacc-2.0.20210808-4.oe2203sp1.src.rpm"
        ],
        "x86_64": [
          "byacc-2.0.20210808-4.oe2203.x86_64.rpm",
          "byacc-debuginfo-2.0.20210808-4.oe2203.x86_64.rpm",
          "byacc-debugsource-2.0.20210808-4.oe2203.x86_64.rpm",
          "byacc-debugsource-2.0.20210808-4.oe2203sp1.x86_64.rpm",
          "byacc-debuginfo-2.0.20210808-4.oe2203sp1.x86_64.rpm",
          "byacc-2.0.20210808-4.oe2203sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS",
        "name": "byacc",
        "purl": "pkg:rpm/openEuler/byacc\u0026distro=openEuler-22.03-LTS"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.20210808-4.oe2203sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "aarch64": [
          "byacc-debugsource-2.0.20210808-4.oe2203sp1.aarch64.rpm",
          "byacc-debuginfo-2.0.20210808-4.oe2203sp1.aarch64.rpm",
          "byacc-2.0.20210808-4.oe2203sp1.aarch64.rpm"
        ],
        "noarch": [
          "byacc-help-2.0.20210808-4.oe2203sp1.noarch.rpm"
        ],
        "src": [
          "byacc-2.0.20210808-4.oe2203sp1.src.rpm"
        ],
        "x86_64": [
          "byacc-debugsource-2.0.20210808-4.oe2203sp1.x86_64.rpm",
          "byacc-debuginfo-2.0.20210808-4.oe2203sp1.x86_64.rpm",
          "byacc-2.0.20210808-4.oe2203sp1.x86_64.rpm"
        ]
      },
      "package": {
        "ecosystem": "openEuler:22.03-LTS-SP1",
        "name": "byacc",
        "purl": "pkg:rpm/openEuler/byacc\u0026distro=openEuler-22.03-LTS-SP1"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.20210808-4.oe2203sp1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "severity": "Medium"
  },
  "details": "Berkeley Yacc is an LALR(1) parser generator.  Berkeley Yacc has been made as compatible as possible with AT\u0026amp;T Yacc.  Berkeley Yacc can accept any input specification that conforms to the AT\u0026amp;T Yacc documentation.  Specifications that take advantage of undocumented features of AT\u0026amp;T Yacc will probably be rejected.\r\n\r\nSecurity Fix(es):\r\n\r\nNo description is available for this CVE.(CVE-2021-33641)\r\n\r\nNo description is available for this CVE.(CVE-2021-33642)",
  "id": "OESA-2023-1033",
  "modified": "2026-08-06T11:05:30Z",
  "published": "2023-01-13T11:05:30Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1033"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-33641"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-33642"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "byacc security update",
  "upstream": [
    "CVE-2021-33641",
    "CVE-2021-33642"
  ]
}

CVE-2021-33641 (GCVE-0-2021-33641)

Vulnerability from cvelistv5 – Published: 2023-01-20 00:00 – Updated: 2025-04-03 20:03

Summary

When processing files, malloc stores the data of the current line. When processing comments, malloc incorrectly accesses the released memory (use after free).

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-02 15:37 UTC

CWE

CWE-416 - : use after free

Assigner

openEuler mitre root

References

1 reference

URL	Tags
https://gitee.com/src-openeuler/byacc/commit/5022…

Impacted products

1 product

Vendor	Product	Version
n/a	byacc	Affected: <1.9.20200330 and <2.0.20210808

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T23:58:21.542Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4d"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 7.8,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-33641",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-02T15:37:25.468877Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-03T20:03:08.779Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "byacc",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c1.9.20200330 and \u003c2.0.20210808"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "When processing files, malloc stores the data of the current line. When processing comments, malloc incorrectly accesses the released memory (use after free)."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-416",
              "description": "CWE-416 : use after free",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-01-20T00:00:00.000Z",
        "orgId": "7e1ac599-2767-43fa-b3ea-f10178cc98f2",
        "shortName": "openEuler"
      },
      "references": [
        {
          "url": "https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4d"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "7e1ac599-2767-43fa-b3ea-f10178cc98f2",
    "assignerShortName": "openEuler",
    "cveId": "CVE-2021-33641",
    "datePublished": "2023-01-20T00:00:00.000Z",
    "dateReserved": "2021-05-28T00:00:00.000Z",
    "dateUpdated": "2025-04-03T20:03:08.779Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

CVE-2021-33642 (GCVE-0-2021-33642)

Vulnerability from cvelistv5 – Published: 2023-01-20 00:00 – Updated: 2025-04-02 14:47

Summary

When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function.

Severity

5.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-04-02 14:45 UTC

CWE

CWE-835 - : infinite loop

Assigner

openEuler mitre root

References

1 reference

URL	Tags
https://gitee.com/src-openeuler/byacc/commit/5022…

Impacted products

1 product

Vendor	Product	Version
n/a	byacc	Affected: <1.9.20200330 and <2.0.20210808

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T23:58:21.558Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4d"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2021-33642",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-04-02T14:45:29.359598Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-04-02T14:47:37.730Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "byacc",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c1.9.20200330 and \u003c2.0.20210808"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "When a file is processed, an infinite loop occurs in next_inline() of the more_curly() function."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-835",
              "description": "CWE-835 : infinite loop",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2023-01-20T00:00:00.000Z",
        "orgId": "7e1ac599-2767-43fa-b3ea-f10178cc98f2",
        "shortName": "openEuler"
      },
      "references": [
        {
          "url": "https://gitee.com/src-openeuler/byacc/commit/50225f48c6b53e9d7c936681a06682404cb8ec4d"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "7e1ac599-2767-43fa-b3ea-f10178cc98f2",
    "assignerShortName": "openEuler",
    "cveId": "CVE-2021-33642",
    "datePublished": "2023-01-20T00:00:00.000Z",
    "dateReserved": "2021-05-28T00:00:00.000Z",
    "dateUpdated": "2025-04-02T14:47:37.730Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

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

OESA-2023-1033 (CVE-2021-33641)

CVE-2021-33641 (GCVE-0-2021-33641)

CVE-2021-33642 (GCVE-0-2021-33642)

Tags

Sightings

Nomenclature

Related by attack behaviour