CVE-2026-20421 (GCVE-0-2026-20421)

Vulnerability from cvelistv5 – Published: 2026-02-02 08:14 – Updated: 2026-02-02 21:26
VLAI?
Summary
In Modem, there is a possible system crash due to improper input validation. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01738293; Issue ID: MSV-5922.
Severity ?
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
MediaTek, Inc. MT2735, MT6833, MT6853, MT6855, MT6873, MT6875, MT6877, MT6880, MT6883, MT6885, MT6889, MT6890, MT6891, MT6893, MT8791 Affected: Modem NR15
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-20421",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-02-02T21:26:29.805108Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-02-02T21:26:56.214Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "MT2735, MT6833, MT6853, MT6855, MT6873, MT6875, MT6877, MT6880, MT6883, MT6885, MT6889, MT6890, MT6891, MT6893, MT8791",
          "vendor": "MediaTek, Inc.",
          "versions": [
            {
              "status": "affected",
              "version": "Modem NR15"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In Modem, there is a possible system crash due to improper input validation. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01738293; Issue ID: MSV-5922."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-02-02T08:14:41.044Z",
        "orgId": "ee979b05-11f8-4f25-a7e0-a1fa9c190374",
        "shortName": "MediaTek"
      },
      "references": [
        {
          "url": "https://corp.mediatek.com/product-security-bulletin/February-2026"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "ee979b05-11f8-4f25-a7e0-a1fa9c190374",
    "assignerShortName": "MediaTek",
    "cveId": "CVE-2026-20421",
    "datePublished": "2026-02-02T08:14:41.044Z",
    "dateReserved": "2025-11-03T01:30:59.010Z",
    "dateUpdated": "2026-02-02T21:26:56.214Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-20421\",\"sourceIdentifier\":\"security@mediatek.com\",\"published\":\"2026-02-02T09:15:57.257\",\"lastModified\":\"2026-02-03T21:23:50.483\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In Modem, there is a possible system crash due to improper input validation. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01738293; Issue ID: MSV-5922.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"security@mediatek.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-125\"}]}],\"configurations\":[{\"operator\":\"AND\",\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:mediatek:nr15:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"E30A2D2E-6A72-4070-A471-EEE75F7D07F2\"}]},{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt2735:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"7F1D09FC-5BE9-4B23-82F1-3C6EAC5711A6\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6833:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"9814939B-F05E-4870-90C0-7C0F6BAAEB39\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6853:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"366F1912-756B-443E-9962-224937DD7DFB\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6855:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"89AFEE24-7AAD-4EDB-8C3E-EDBA3240730A\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6873:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"F6B8A36E-C5FB-44AE-A1C3-50EBF4C68F6B\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6875:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"80BDC5EC-E822-4BC7-8C0D-E8AD8396E8FE\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6877:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"7CA9352F-E9BD-4656-9B7C-4AFEE2C78E58\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6880:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"68CF4A7A-3136-4C4C-A795-81323896BE11\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6883:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"15E2EC3F-9FB3-488B-B1C1-2793A416C755\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6885:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"DD64413C-C774-4C4F-9551-89E1AA9469EE\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6889:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"3B787DC3-8E5A-4968-B20B-37B6257FAAE2\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6890:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"171D1C08-F055-44C0-913C-AA2B73AF5B72\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6891:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"D8E91CA4-CA5B-40D1-9A96-2B875104BCF4\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt6893:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"213B5C7F-D965-4312-9CDF-4F06FA77D401\"},{\"vulnerable\":false,\"criteria\":\"cpe:2.3:h:mediatek:mt8791:-:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"9CD2C3EC-B62D-4616-964F-FDBE5B14A449\"}]}]}],\"references\":[{\"url\":\"https://corp.mediatek.com/product-security-bulletin/February-2026\",\"source\":\"security@mediatek.com\",\"tags\":[\"Vendor Advisory\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20421\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-02-02T21:26:29.805108Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-02-02T21:25:12.729Z\"}}], \"cna\": {\"affected\": [{\"vendor\": \"MediaTek, Inc.\", \"product\": \"MT2735, MT6833, MT6853, MT6855, MT6873, MT6875, MT6877, MT6880, MT6883, MT6885, MT6889, MT6890, MT6891, MT6893, MT8791\", \"versions\": [{\"status\": \"affected\", \"version\": \"Modem NR15\"}]}], \"references\": [{\"url\": \"https://corp.mediatek.com/product-security-bulletin/February-2026\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"In Modem, there is a possible system crash due to improper input validation. This could lead to remote denial of service, if a UE has connected to a rogue base station controlled by the attacker, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: MOLY01738293; Issue ID: MSV-5922.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-125\", \"description\": \"CWE-125 Out-of-bounds Read\"}]}], \"providerMetadata\": {\"orgId\": \"ee979b05-11f8-4f25-a7e0-a1fa9c190374\", \"shortName\": \"MediaTek\", \"dateUpdated\": \"2026-02-02T08:14:41.044Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-20421\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-02-02T21:26:56.214Z\", \"dateReserved\": \"2025-11-03T01:30:59.010Z\", \"assignerOrgId\": \"ee979b05-11f8-4f25-a7e0-a1fa9c190374\", \"datePublished\": \"2026-02-02T08:14:41.044Z\", \"assignerShortName\": \"MediaTek\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.