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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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    "title": "Security update on CVE-2021-21342",
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          "date": "2021-03-23T00:15:00Z",
          "number": "1",
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          "date": "2025-11-29T15:17:20Z",
          "number": "2",
          "summary": "Official Publication"
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          "date": "2025-12-23T22:15:38Z",
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  "vulnerabilities": [
    {
      "cve": "CVE-2021-21342",
      "cwe": {
        "id": "CWE-502",
        "name": "Deserialization of Untrusted Data"
      },
      "notes": [
        {
          "category": "description",
          "text": "XStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is a vulnerability where the processed stream at unmarshalling time contains type information to recreate the formerly written objects. XStream creates therefore new instances based on these type information. An attacker can manipulate the processed input stream and replace or inject objects, that result in a server-side forgery request. No user is affected, who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.",
          "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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          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-21342"
        },
        {
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          "url": "http://x-stream.github.io/changes.html#1.4.16"
        },
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          "summary": "https://github.com/x-stream/xstream/security/advisories/GHSA-hvv8-336g-rx3m",
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          "category": "external",
          "summary": "https://security.netapp.com/advisory/ntap-20210430-0002/",
          "url": "https://security.netapp.com/advisory/ntap-20210430-0002/"
        },
        {
          "category": "external",
          "summary": "https://www.debian.org/security/2021/dsa-5004",
          "url": "https://www.debian.org/security/2021/dsa-5004"
        },
        {
          "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/cpujan2022.html",
          "url": "https://www.oracle.com/security-alerts/cpujan2022.html"
        },
        {
          "category": "external",
          "summary": "https://www.oracle.com/security-alerts/cpuoct2021.html",
          "url": "https://www.oracle.com/security-alerts/cpuoct2021.html"
        },
        {
          "category": "external",
          "summary": "https://x-stream.github.io/CVE-2021-21342.html",
          "url": "https://x-stream.github.io/CVE-2021-21342.html"
        },
        {
          "category": "external",
          "summary": "https://x-stream.github.io/security.html#workaround",
          "url": "https://x-stream.github.io/security.html#workaround"
        }
      ],
      "release_date": "2021-03-23T00:15:00Z",
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 5.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:N",
            "version": "2.0"
          },
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 9.1,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "products": [
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            "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",
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          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Critical"
        },
        {
          "category": "impact",
          "details": "critical",
          "product_ids": [
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}