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      "text": "High"
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    "distribution": {
      "text": "TuxCare License Agreement",
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        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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          "date": "2021-06-11T16:15:00Z",
          "number": "1",
          "summary": "Initial version"
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        {
          "date": "2025-11-29T14:51:27Z",
          "number": "2",
          "summary": "Official Publication"
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        {
          "date": "2025-12-23T22:15:38Z",
          "number": "3",
          "summary": "Update document"
        },
        {
          "date": "2026-06-13T09:30:36Z",
          "number": "4",
          "summary": "Update document"
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      "version": "4"
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    "title": "Security update on CVE-2021-22901"
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  "vulnerabilities": [
    {
      "cve": "CVE-2021-22901",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "notes": [
        {
          "category": "description",
          "text": "curl 7.75.0 through 7.76.1 suffers from a use-after-free vulnerability resulting in already freed memory being used when a TLS 1.3 session ticket arrives over a connection. A malicious server can use this in rare unfortunate circumstances to potentially reach remote code execution in the client. When libcurl at run-time sets up support for TLS 1.3 session tickets on a connection using OpenSSL, it stores pointers to the transfer in-memory object for later retrieval when a session ticket arrives. If the connection is used by multiple transfers (like with a reused HTTP/1.1 connection or multiplexed HTTP/2 connection) that first transfer object might be freed before the new session is established on that connection and then the function will access a memory buffer that might be freed. When using that memory, libcurl might even call a function pointer in the object, making it possible for a remote code execution if the server could somehow manage to get crafted memory content into the correct place in memory.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        },
        {
          "category": "other",
          "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.",
          "title": "Statement"
        }
      ],
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          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-22901"
        },
        {
          "category": "external",
          "summary": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf",
          "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf"
        },
        {
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          "summary": "https://cert-portal.siemens.com/productcert/pdf/ssa-732250.pdf",
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          "url": "https://curl.se/docs/CVE-2021-22901.html"
        },
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          "category": "external",
          "summary": "https://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479",
          "url": "https://github.com/curl/curl/commit/7f4a9a9b2a49547eae24d2e19bc5c346e9026479"
        },
        {
          "category": "external",
          "summary": "https://hackerone.com/reports/1180380",
          "url": "https://hackerone.com/reports/1180380"
        },
        {
          "category": "external",
          "summary": "https://security.netapp.com/advisory/ntap-20210723-0001/",
          "url": "https://security.netapp.com/advisory/ntap-20210723-0001/"
        },
        {
          "category": "external",
          "summary": "https://security.netapp.com/advisory/ntap-20210727-0007/",
          "url": "https://security.netapp.com/advisory/ntap-20210727-0007/"
        },
        {
          "category": "external",
          "summary": "https://www.oracle.com//security-alerts/cpujul2021.html",
          "url": "https://www.oracle.com//security-alerts/cpujul2021.html"
        },
        {
          "category": "external",
          "summary": "https://www.oracle.com/security-alerts/cpuapr2022.html",
          "url": "https://www.oracle.com/security-alerts/cpuapr2022.html"
        },
        {
          "category": "external",
          "summary": "https://www.oracle.com/security-alerts/cpujan2022.html",
          "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
        }
      ],
      "release_date": "2021-06-11T16:15:00Z",
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "Ubuntu-18:libmysqlclient-dev-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64",
            "Ubuntu-18:libmysqlclient20-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64",
            "Ubuntu-18:libmysqld-dev-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64",
            "Ubuntu-18:mysql-client-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.all",
            "Ubuntu-18:mysql-client-5.7-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64",
            "Ubuntu-18:mysql-client-core-5.7-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64",
            "Ubuntu-18:mysql-server-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.all",
            "Ubuntu-18:mysql-server-5.7-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64",
            "Ubuntu-18:mysql-server-core-5.7-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64",
            "Ubuntu-18:mysql-source-5.7-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64",
            "Ubuntu-18:mysql-testsuite-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.all",
            "Ubuntu-18:mysql-testsuite-5.7-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        },
        {
          "category": "impact",
          "date": "2026-06-12T12:54:59.711900Z",
          "details": "CVE-2021-22901 only affects libcurl 7.75.0–7.76.1 when using the OpenSSL backend with TLS 1.3 session tickets on reused/multiplexed HTTP connections. MySQL 5.7.41 does not include an affected libcurl version—Enterprise builds link curl 7.86.0—and the server’s database protocol/TLS stack does not rely on libcurl, so the vulnerable code path is not present in this product.",
          "product_ids": [
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            "Ubuntu-18:libmysqlclient20-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64",
            "Ubuntu-18:libmysqld-dev-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.amd64",
            "Ubuntu-18:mysql-client-0:5.7.44-0ubuntu0.18.04.1+tuxcare.els1.all",
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          ]
        }
      ]
    }
  ]
}