{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-31885",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-31885",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2021-11-09T11:31:58.000Z",
    "updatedAt": "2024-08-03T23:10:30.607Z",
    "importedAt": "2026-10-24T01:56:32.228Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": null,
      "summary": "A vulnerability has been identified in APOGEE MBC (PPC) (BACnet) (All versions), APOGEE MBC (PPC) (P2 Ethernet) (All versions), APOGEE MEC (PPC) (BACnet) (All versions), APOGEE MEC (PPC) (P2 Ethernet) (All versions), APOGEE PXC Compact (BACnet) (All versions < V3.5.4), APOGEE PXC Compact (P2 Ethernet) (All versions < V2.8.19), APOGEE PXC Modular (BACnet) (All versions < V3.5.4), APOGEE PXC Modular (P2 Ethernet) (All versions < V2.8.19), Desigo PXC00-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC00-U (All versions >= V2.3 and < V6.30.016), Desigo PXC001-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC100-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC12-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC128-U (All versions >= V2.3 and < V6.30.016), Desigo PXC200-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC22.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC36.1-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC50-E.D (All versions >= V2.3 and < V6.30.016), Desigo PXC64-U (All versions >= V2.3 and < V6.30.016), Desigo PXM20-E (All versions >= V2.3 and < V6.30.016), Nucleus NET (All versions), Nucleus ReadyStart V3 (All versions < V2017.02.4), Nucleus ReadyStart V4 (All versions < V4.1.1), Nucleus Source Code (All versions), PLUSCONTROL 1st Gen (All versions), TALON TC Compact (BACnet) (All versions < V3.5.4), TALON TC Modular (BACnet) (All versions < V3.5.4). TFTP server application allows for reading the contents of the TFTP memory buffer via sending malformed TFTP commands. (FSMD-2021-0009)",
      "affected": [
        {
          "vendor": "Siemens",
          "product": "APOGEE MBC (PPC) (BACnet)",
          "versions": [
            {
              "version": "All versions",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "APOGEE MBC (PPC) (P2 Ethernet)",
          "versions": [
            {
              "version": "All versions",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "APOGEE MEC (PPC) (BACnet)",
          "versions": [
            {
              "version": "All versions",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "APOGEE MEC (PPC) (P2 Ethernet)",
          "versions": [
            {
              "version": "All versions",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "APOGEE PXC Compact (BACnet)",
          "versions": [
            {
              "version": "All versions < V3.5.4",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "APOGEE PXC Compact (P2 Ethernet)",
          "versions": [
            {
              "version": "All versions < V2.8.19",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "APOGEE PXC Modular (BACnet)",
          "versions": [
            {
              "version": "All versions < V3.5.4",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "APOGEE PXC Modular (P2 Ethernet)",
          "versions": [
            {
              "version": "All versions < V2.8.19",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC00-E.D",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC00-U",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC001-E.D",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC100-E.D",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC12-E.D",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC128-U",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC200-E.D",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC22-E.D",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC22.1-E.D",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC36.1-E.D",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC50-E.D",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXC64-U",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Desigo PXM20-E",
          "versions": [
            {
              "version": "All versions >= V2.3 and < V6.30.016",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Nucleus NET",
          "versions": [
            {
              "version": "All versions",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Nucleus ReadyStart V3",
          "versions": [
            {
              "version": "All versions < V2017.02.4",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Nucleus ReadyStart V4",
          "versions": [
            {
              "version": "All versions < V4.1.1",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "Nucleus Source Code",
          "versions": [
            {
              "version": "All versions",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "PLUSCONTROL 1st Gen",
          "versions": [
            {
              "version": "All versions",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "TALON TC Compact (BACnet)",
          "versions": [
            {
              "version": "All versions < V3.5.4",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Siemens",
          "product": "TALON TC Modular (BACnet)",
          "versions": [
            {
              "version": "All versions < V3.5.4",
              "status": "affected"
            }
          ]
        }
      ]
    }
  }
}