GCVE Workshop - 22 September 2026 (14:00-18:00), Luxembourg Before The Vulnopticon Conference - Registration

CVE-2026-21639 (GCVE-0-2026-21639)

Vulnerability from cvelistv5 – Published: 2026-01-08 16:14 – Updated: 2026-07-30 06:02
VLAI
Summary
A malicious actor in Wi-Fi range of the affected product could leverage a vulnerability in the airMAX Wireless Protocol to achieve a remote code execution (RCE) within the affected product.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.4 (Medium)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-08 17:09 UTC
CWE
  • CWE-120 - Classic Buffer Overflow
  • CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
Assigner
References
Impacted products
Vendor Product Version CPE status
Ubiquiti Inc airMAX AC Affected: 0 , < 8.7.21 (semver)
guessed Create a notification for this product.
Ubiquiti Inc airMAX M Affected: 0 , < 6.3.24 (semver)
guessed Create a notification for this product.
Ubiquiti Inc airFiber AF60-XG Affected: 0 , < 1.2.3 (semver)
guessed Create a notification for this product.
Ubiquiti Inc airFiber AF60 Affected: 0 , < 2.6.8 (semver)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "ADJACENT_NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 5.4,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "LOW",
              "integrityImpact": "LOW",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-21639",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-01-08T17:09:52.634464Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "cweId": "CWE-77",
                "description": "CWE-77 Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-01-08T17:21:53.724Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "airMAX AC",
          "vendor": "Ubiquiti Inc",
          "versions": [
            {
              "lessThan": "8.7.21",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "airMAX M",
          "vendor": "Ubiquiti Inc",
          "versions": [
            {
              "lessThan": "6.3.24",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "airFiber AF60-XG",
          "vendor": "Ubiquiti Inc",
          "versions": [
            {
              "lessThan": "1.2.3",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "airFiber AF60",
          "vendor": "Ubiquiti Inc",
          "versions": [
            {
              "lessThan": "2.6.8",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A malicious actor in Wi-Fi range of the affected product could leverage a vulnerability in the airMAX Wireless Protocol to achieve a remote code execution (RCE) within the affected product."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-120",
              "description": "CWE-120 Classic Buffer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-30T06:02:49.974Z",
        "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
        "shortName": "hackerone"
      },
      "references": [
        {
          "url": "https://community.ui.com/releases/Security-Advisory-Bulletin-061-061/1e4fe5f8-29c7-4a7d-a518-01b1537983ba"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
    "assignerShortName": "hackerone",
    "cveId": "CVE-2026-21639",
    "datePublished": "2026-01-08T16:14:22.626Z",
    "dateReserved": "2026-01-01T15:00:02.339Z",
    "dateUpdated": "2026-07-30T06:02:49.974Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-21639",
      "date": "2026-09-17",
      "epss": "0.00383",
      "percentile": "0.32078"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-21639\",\"sourceIdentifier\":\"support@hackerone.com\",\"published\":\"2026-01-08T17:15:50.483\",\"lastModified\":\"2026-07-30T06:25:51.670\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A malicious actor in Wi-Fi range of the affected product could leverage a vulnerability in the airMAX Wireless Protocol to achieve a remote code execution (RCE) within the affected product.\"},{\"lang\":\"es\",\"value\":\"Un actor malicioso dentro del alcance Wi-Fi del producto afectado podr\u00eda aprovechar una vulnerabilidad en el Protocolo Inal\u00e1mbrico airMAX para lograr una ejecuci\u00f3n remota de c\u00f3digo (RCE) dentro del producto afectado.\\n\\nProductos Afectados:\\nairMAX AC (Versi\u00f3n 8.7.20 y anteriores)\\nairMAX M (Versi\u00f3n 6.3.22 y anteriores)\\nairFiber AF60-XG (Versi\u00f3n 1.2.2 y anteriores)\\nairFiber AF60 (Versi\u00f3n 2.6.7 y anteriores)\\n\\nMitigaci\u00f3n:\\nActualice su airMAX AC a la Versi\u00f3n 8.7.21 o posterior.\\nActualice su airMAX M a la Versi\u00f3n 6.3.24 o posterior.\\nActualice su airFiber AF60-XG a la Versi\u00f3n 1.2.3 o posterior.\\nActualice su airFiber AF60 a la Versi\u00f3n 2.6.8 o posterior.\"}],\"affected\":[{\"source\":\"support@hackerone.com\",\"affectedData\":[{\"vendor\":\"Ubiquiti Inc\",\"product\":\"airMAX AC\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"8.7.21\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Ubiquiti Inc\",\"product\":\"airMAX M\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"6.3.24\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Ubiquiti Inc\",\"product\":\"airFiber AF60-XG\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"1.2.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Ubiquiti Inc\",\"product\":\"airFiber AF60\",\"defaultStatus\":\"unaffected\",\"versions\":[{\"version\":\"0\",\"lessThan\":\"2.6.8\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"support@hackerone.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N\",\"baseScore\":5.4,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":2.5}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-01-08T17:09:52.634464Z\",\"id\":\"CVE-2026-21639\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"support@hackerone.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-120\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-77\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:ui:airmax_ac_firmware:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"8.7.21\",\"matchCriteriaId\":\"E6CAE32F-15CF-472D-9CB2-2B863A9FF429\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:ui:airmax_ac:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D7522076-32AA-4C46-A383-55496EB8E403\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:ui:airmax_m_firmware:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"6.3.24\",\"matchCriteriaId\":\"23228893-D868-4C84-82A8-3AAA30193F95\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:ui:airmax_m:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"22401E7D-9BB7-4015-A28B-1C134C429E56\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:ui:airfiber_af60-xg_firmware:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"1.2.3\",\"matchCriteriaId\":\"C7197F20-55D0-4EF4-9C97-60A56E888427\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:ui:airfiber_af60-xg:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"AE317510-2899-438A-9C95-83A6C7FA1B2F\"}]}]},{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:ui:airfiber_af60_firmware:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"2.6.8\",\"matchCriteriaId\":\"F1C29843-49DD-4B68-89C6-14E3CFB70E62\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:ui:airfiber_af60:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"30F52A22-F069-426B-8664-E94E41E3863E\"}]}]}],\"references\":[{\"url\":\"https://community.ui.com/releases/Security-Advisory-Bulletin-061-061/1e4fe5f8-29c7-4a7d-a518-01b1537983ba\",\"source\":\"support@hackerone.com\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "redhat_vex": {
      "current_release_date": "2026-01-10T05:41:08+00:00",
      "cve": "CVE-2026-21639",
      "id": "CVE-2026-21639",
      "initial_release_date": "2026-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "CVE-2026-21639",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-21639.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 5.4, \"attackVector\": \"ADJACENT_NETWORK\", \"baseSeverity\": \"MEDIUM\", \"vectorString\": \"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N\", \"integrityImpact\": \"LOW\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"NONE\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"LOW\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-21639\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-01-08T17:09:52.634464Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-77\", \"description\": \"CWE-77 Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-01-08T17:21:36.953Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"Ubiquiti Inc\", \"product\": \"airMAX AC\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"8.7.21\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"Ubiquiti Inc\", \"product\": \"airMAX M\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"6.3.24\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"Ubiquiti Inc\", \"product\": \"airFiber AF60-XG\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"1.2.3\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}, {\"vendor\": \"Ubiquiti Inc\", \"product\": \"airFiber AF60\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"2.6.8\", \"versionType\": \"semver\"}], \"defaultStatus\": \"unaffected\"}], \"references\": [{\"url\": \"https://community.ui.com/releases/Security-Advisory-Bulletin-061-061/1e4fe5f8-29c7-4a7d-a518-01b1537983ba\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A malicious actor in Wi-Fi range of the affected product could leverage a vulnerability in the airMAX Wireless Protocol to achieve a remote code execution (RCE) within the affected product.\\r\\n\\r\\n \\r\\n\\r\\nAffected Products:\\r\\n\\r\\nairMAX AC (Version 8.7.20 and earlier)\\r\\nairMAX M (Version 6.3.22 and earlier)\\r\\nairFiber AF60-XG (Version 1.2.2 and earlier)\\r\\nairFiber AF60 (Version 2.6.7 and earlier)\\r\\n\\r\\n \\r\\n\\r\\nMitigation:\\r\\n\\r\\nUpdate your airMAX AC to Version 8.7.21 or later.\\r\\nUpdate your airMAX M to Version 6.3.24 or later.\\r\\nUpdate your airFiber AF60-XG to Version 1.2.3 or later.\\r\\nUpdate your airFiber AF60 to Version 2.6.8 or later.\"}], \"providerMetadata\": {\"orgId\": \"36234546-b8fa-4601-9d6f-f4e334aa8ea1\", \"shortName\": \"hackerone\", \"dateUpdated\": \"2026-01-08T16:14:22.626Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-21639\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-08T17:21:53.724Z\", \"dateReserved\": \"2026-01-01T15:00:02.339Z\", \"assignerOrgId\": \"36234546-b8fa-4601-9d6f-f4e334aa8ea1\", \"datePublished\": \"2026-01-08T16:14:22.626Z\", \"assignerShortName\": \"hackerone\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.