{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-21620",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-20T13:36:03.423294Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-20T13:36:39.878Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
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          "collectionURL": "https://github.com",
          "cpes": [
            "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*"
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          "defaultStatus": "unaffected",
          "modules": [
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          "packageURL": "pkg:github/erlang/otp",
          "product": "OTP",
          "programFiles": [
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          "repo": "https://github.com/erlang/otp",
          "vendor": "Erlang",
          "versions": [
            {
              "changes": [
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                  "at": "26.2.5.17",
                  "status": "unaffected"
                },
                {
                  "at": "27.3.4.8",
                  "status": "unaffected"
                },
                {
                  "at": "28.3.2",
                  "status": "unaffected"
                }
              ],
              "lessThan": "*",
              "status": "affected",
              "version": "17.0",
              "versionType": "otp"
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            {
              "changes": [
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                  "at": "655fb95725ba2fb811740b57e106873833824344",
                  "status": "unaffected"
                },
                {
                  "at": "3970738f687325138eb75f798054fa8960ac354e",
                  "status": "unaffected"
                },
                {
                  "at": "696fdec922661d4a3cc528fc34bc24fae8d4ad8a",
                  "status": "unaffected"
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              ],
              "lessThan": "*",
              "status": "affected",
              "version": "07b8f441ca711f9812fad9e9115bab3c3aa92f79",
              "versionType": "git"
            }
          ]
        },
        {
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          "modules": [
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          "packageName": "inets",
          "packageURL": "pkg:otp/inets?repository_url=https:%2F%2Fgithub.com%2Ferlang%2Fotp\u0026vcs_url=git%20https:%2F%2Fgithub.com%2Ferlang%2Fotp.git",
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          "versions": [
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              "status": "affected",
              "version": "5.10",
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          "vendor": "Erlang",
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                  "at": "1.1.1.1",
                  "status": "unaffected"
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                  "at": "1.2.2.1",
                  "status": "unaffected"
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                  "at": "1.2.4",
                  "status": "unaffected"
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              ],
              "lessThan": "*",
              "status": "affected",
              "version": "1.0",
              "versionType": "otp"
            }
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        }
      ],
      "configurations": [
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          "supportingMedia": [
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              "value": "A TFTP server must be started and the TFTP port must be reachable by the attacker, using the \u003ctt\u003etftp\u003c/tt\u003e application (or the legacy \u003ctt\u003einets\u003c/tt\u003e TFTP service) with the \u003ctt\u003etftp_file\u003c/tt\u003e callback module configured with the \u003ctt\u003e{root_dir, Dir}\u003c/tt\u003e option."
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          ],
          "value": "A TFTP server must be started and the TFTP port must be reachable by the attacker, using the tftp application (or the legacy inets TFTP service) with the tftp_file callback module configured with the {root_dir, Dir} option."
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      ],
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                  "versionEndExcluding": "26.2.5.17",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "27.3.4.8",
                  "versionStartIncluding": "27.0",
                  "vulnerable": true
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                  "versionEndExcluding": "28.3.2",
                  "versionStartIncluding": "28.0",
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              "negate": false,
              "operator": "OR"
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          ],
          "operator": "AND"
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      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Luigino Camastra / Aisle Research"
        },
        {
          "lang": "en",
          "type": "remediation reviewer",
          "value": "Jakub Witczak"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Raimo Niskanen"
        }
      ],
      "descriptions": [
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          "lang": "en",
          "supportingMedia": [
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              "base64": false,
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              "value": "Relative Path Traversal, Improper Isolation or Compartmentalization vulnerability in erlang otp erlang/otp (tftp_file modules), erlang otp inets (tftp_file modules), erlang otp tftp (tftp_file modules) allows Relative Path Traversal.\u003cp\u003e This vulnerability is associated with program files \u003ctt\u003elib/tftp/src/tftp_file.erl\u003c/tt\u003e, \u003ctt\u003esrc/tftp_file.erl\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis issue affects OTP from OTP 17.0 before OTP\u0026nbsp;28.3.2, OTP\u0026nbsp;27.3.4.8 and OTP\u0026nbsp;26.2.5.17, corresponding to tftp from 1.0 before 1.2.4, 1.2.2.1 and 1.1.1.1; also inets from 5.10 before 7.0.\u003c/p\u003e"
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          ],
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          "capecId": "CAPEC-139",
          "descriptions": [
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              "lang": "en",
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            }
          ]
        }
      ],
      "metrics": [
        {
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 2.3,
            "baseSeverity": "LOW",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
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              "type": "CWE"
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        "dateUpdated": "2026-07-24T14:16:25.195Z",
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          ],
          "url": "https://github.com/erlang/otp/security/advisories/GHSA-hmrc-prh3-rpvp"
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          "url": "https://cna.erlef.org/cves/CVE-2026-21620.html"
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          "url": "https://www.erlang.org/doc/system/versions.html#order-of-versions"
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          "url": "https://github.com/erlang/otp/pull/10706"
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      "source": {
        "discovery": "EXTERNAL"
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      "title": "TFTP Path Traversal",
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    "cveId": "CVE-2026-21620",
    "datePublished": "2026-02-20T10:57:08.620Z",
    "dateReserved": "2026-01-01T03:46:45.934Z",
    "dateUpdated": "2026-07-24T14:16:25.195Z",
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