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      "text": "Medium"
    },
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    "csaf_version": "2.0",
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      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "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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        "engine": {
          "name": "pyCSAF"
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      "id": "CVE-2021-22947-ELS_OS-RHEL7ELS",
      "initial_release_date": "2021-09-29T20:15:00Z",
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        {
          "date": "2021-09-29T20:15:00Z",
          "number": "1",
          "summary": "Initial version"
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          "date": "2026-06-13T02:53:51Z",
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      "status": "final",
      "version": "2"
    },
    "title": "Security update on CVE-2021-22947"
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  "vulnerabilities": [
    {
      "cve": "CVE-2021-22947",
      "notes": [
        {
          "category": "description",
          "text": "When curl >= 7.20.0 and <= 7.78.0 connects to an IMAP or POP3 server to retrieve data using STARTTLS to upgrade to TLS security, the server can respond and send back multiple responses at once that curl caches. curl would then upgrade to TLS but not flush the in-queue of cached responses but instead continue using and trustingthe responses it got *before* the TLS handshake as if they were authenticated.Using this flaw, it allows a Man-In-The-Middle attacker to first inject the fake responses, then pass-through the TLS traffic from the legitimate server and trick curl into sending data back to the user thinking the attacker's injected data comes from the TLS-protected server.",
          "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"
        }
      ],
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          "Red-Hat-7:libcurl-devel-0:7.29.0-59.0.3.el7_9.2.tuxcare.els2.x86_64",
          "Red-Hat-7:libcurl-devel-0:7.29.0-59.0.3.el7_9.2.x86_64"
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        {
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          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-22947"
        },
        {
          "category": "external",
          "summary": "http://seclists.org/fulldisclosure/2022/Mar/29",
          "url": "http://seclists.org/fulldisclosure/2022/Mar/29"
        },
        {
          "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://hackerone.com/reports/1334763",
          "url": "https://hackerone.com/reports/1334763"
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          "summary": "https://lists.debian.org/debian-lts-announce/2021/09/msg00022.html",
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        },
        {
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          "summary": "https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html",
          "url": "https://lists.debian.org/debian-lts-announce/2022/08/msg00017.html"
        },
        {
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          "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/",
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/APOAK4X73EJTAPTSVT7IRVDMUWVXNWGD/"
        },
        {
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          "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/",
          "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RWLEC6YVEM2HWUBX67SDGPSY4CQB72OE/"
        },
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      "release_date": "2021-09-29T20:15:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-06-12T13:07:12.668872Z",
          "details": "This flaw only applies when curl 7.20.0–7.78.0 is used as an IMAP/POP3 client with STARTTLS; it does not affect HTTP/HTTPS or implicit‑TLS variants such as IMAPS/POP3S. Exploitation requires an active, real‑time man‑in‑the‑middle to inject pre‑handshake responses that are then processed post‑handshake—a high‑complexity scenario—with integrity impact only (no confidentiality or availability impact). Enterprise servers/VMs that don’t use curl for STARTTLS mail retrieval, or that access mail via implicit TLS or other channels, have negligible practical exposure, so this can be safely deprioritized.",
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          "cvss_v2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
            "version": "2.0"
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          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "products": [
            "Red-Hat-7:curl-0:7.29.0-59.0.3.el7_9.2.tuxcare.els2.x86_64",
            "Red-Hat-7:curl-0:7.29.0-59.0.3.el7_9.2.x86_64",
            "Red-Hat-7:libcurl-0:7.29.0-59.0.3.el7_9.2.i686",
            "Red-Hat-7:libcurl-0:7.29.0-59.0.3.el7_9.2.tuxcare.els2.i686",
            "Red-Hat-7:libcurl-0:7.29.0-59.0.3.el7_9.2.tuxcare.els2.x86_64",
            "Red-Hat-7:libcurl-0:7.29.0-59.0.3.el7_9.2.x86_64",
            "Red-Hat-7:libcurl-devel-0:7.29.0-59.0.3.el7_9.2.i686",
            "Red-Hat-7:libcurl-devel-0:7.29.0-59.0.3.el7_9.2.tuxcare.els2.i686",
            "Red-Hat-7:libcurl-devel-0:7.29.0-59.0.3.el7_9.2.tuxcare.els2.x86_64",
            "Red-Hat-7:libcurl-devel-0:7.29.0-59.0.3.el7_9.2.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ]
    }
  ]
}