{
  "document": {
    "aggregate_severity": {
      "text": "Medium"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
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        "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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      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
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        "url": "https://security.tuxcare.com/csaf/v2/els_os/centos7els/vex/2021/cve-2021-40528-els_os-centos7els.json"
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      "generator": {
        "date": "2026-05-05T11:27:57Z",
        "engine": {
          "name": "pyCSAF"
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          "date": "2021-09-06T19:15:00Z",
          "number": "1",
          "summary": "Initial version"
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          "number": "2",
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    },
    "title": "Security update on CVE-2021-40528"
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  "vulnerabilities": [
    {
      "cve": "CVE-2021-40528",
      "cwe": {
        "id": "CWE-327",
        "name": "Use of a Broken or Risky Cryptographic Algorithm"
      },
      "notes": [
        {
          "category": "description",
          "text": "The ElGamal implementation in Libgcrypt before 1.9.4 allows plaintext recovery because, during interaction between two cryptographic libraries, a certain dangerous combination of the prime defined by the receiver's public key, the generator defined by the receiver's public key, and the sender's ephemeral exponents can lead to a cross-configuration attack against OpenPGP.",
          "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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          "CentOS-7:libgcrypt-devel-0:1.5.3-14.el7.i686",
          "CentOS-7:libgcrypt-devel-0:1.5.3-14.el7.x86_64"
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          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2021-40528"
        },
        {
          "category": "external",
          "summary": "https://eprint.iacr.org/2021/923",
          "url": "https://eprint.iacr.org/2021/923"
        },
        {
          "category": "external",
          "summary": "https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=3462280f2e23e16adf3ed5176e0f2413d8861320",
          "url": "https://git.gnupg.org/cgi-bin/gitweb.cgi?p=libgcrypt.git%3Ba=commit%3Bh=3462280f2e23e16adf3ed5176e0f2413d8861320"
        },
        {
          "category": "external",
          "summary": "https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1",
          "url": "https://ibm.github.io/system-security-research-updates/2021/07/20/insecurity-elgamal-pt1"
        },
        {
          "category": "external",
          "summary": "https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2",
          "url": "https://ibm.github.io/system-security-research-updates/2021/09/06/insecurity-elgamal-pt2"
        },
        {
          "category": "external",
          "summary": "https://security.gentoo.org/glsa/202210-13",
          "url": "https://security.gentoo.org/glsa/202210-13"
        }
      ],
      "release_date": "2021-09-06T19:15:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2023-11-02T13:10:55Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2023:1698945053",
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            "CentOS-7:libgcrypt-0:1.5.3-14.el7.tuxcare.els1.x86_64",
            "CentOS-7:libgcrypt-devel-0:1.5.3-14.el7.tuxcare.els1.i686",
            "CentOS-7:libgcrypt-devel-0:1.5.3-14.el7.tuxcare.els1.x86_64"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2023:1698945053"
        },
        {
          "category": "none_available",
          "details": "Affected",
          "product_ids": [
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            "CentOS-7:libgcrypt-0:1.5.3-14.el7.x86_64",
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        }
      ],
      "scores": [
        {
          "cvss_v2": {
            "accessComplexity": "HIGH",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 2.6,
            "baseSeverity": "LOW",
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:H/Au:N/C:P/I:N/A:N",
            "version": "2.0"
          },
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
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    }
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}