CVE-2026-20084 (GCVE-0-2026-20084)
Vulnerability from cvelistv5
Published
2026-03-25 16:02
Modified
2026-03-26 17:35
CWE
  • CWE-400 - Uncontrolled Resource Consumption
Summary
A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets. There are workarounds that address this vulnerability.
Impacted products
Vendor Product Version
Cisco Cisco IOS XE Software Version: 16.6.1
Version: 16.6.2
Version: 16.6.3
Version: 16.6.4
Version: 16.6.5
Version: 16.6.4a
Version: 16.6.6
Version: 16.6.7
Version: 16.6.8
Version: 16.6.9
Version: 16.6.10
Version: 16.7.1
Version: 16.8.1
Version: 16.8.1a
Version: 16.8.1s
Version: 16.9.1
Version: 16.9.2
Version: 16.9.1s
Version: 16.9.3
Version: 16.9.4
Version: 16.9.5
Version: 16.9.6
Version: 16.9.7
Version: 16.9.8
Version: 16.10.1
Version: 16.10.1s
Version: 16.10.1e
Version: 16.11.1
Version: 16.11.1b
Version: 16.11.1s
Version: 16.12.1
Version: 16.12.1s
Version: 16.12.1c
Version: 16.12.2
Version: 16.12.3
Version: 16.12.8
Version: 16.12.2s
Version: 16.12.4
Version: 16.12.3s
Version: 16.12.3a
Version: 16.12.4a
Version: 16.12.5
Version: 16.12.6
Version: 16.12.5b
Version: 16.12.6a
Version: 16.12.7
Version: 17.1.1
Version: 17.1.1s
Version: 17.1.1t
Version: 17.1.3
Version: 17.2.1
Version: 17.2.1a
Version: 17.3.1
Version: 17.3.2
Version: 17.3.3
Version: 17.3.2a
Version: 17.3.4
Version: 17.3.5
Version: 17.3.6
Version: 17.3.7
Version: 17.3.8
Version: 17.3.8a
Version: 17.4.1
Version: 17.5.1
Version: 17.6.1
Version: 17.6.2
Version: 17.6.3
Version: 17.6.1y
Version: 17.6.4
Version: 17.6.5
Version: 17.6.6
Version: 17.6.6a
Version: 17.6.5a
Version: 17.6.7
Version: 17.6.8
Version: 17.7.1
Version: 17.10.1
Version: 17.10.1b
Version: 17.8.1
Version: 17.9.1
Version: 17.9.2
Version: 17.9.3
Version: 17.9.4
Version: 17.9.5
Version: 17.9.4a
Version: 17.9.6
Version: 17.9.6a
Version: 17.9.7
Version: 17.9.8
Version: 17.11.1
Version: 17.12.1
Version: 17.12.2
Version: 17.12.3
Version: 17.12.4
Version: 17.12.5
Version: 17.12.1z5
Version: 17.13.1
Version: 17.14.1
Version: 17.15.1
Version: 17.15.2
Version: 17.15.3
Version: 17.15.2b
Version: 17.15.4
Version: 17.15.4d
Version: 17.16.1
Version: 17.17.1
Version: 17.18.1
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      "descriptions": [
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          "lang": "en",
          "value": "A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \r\n\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \r\n\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\r\n\r   There are workarounds that address this vulnerability."
        }
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      "exploits": [
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          "lang": "en",
          "value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory."
        }
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
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        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
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      "references": [
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          "name": "cisco-sa-bootp-WuBhNBxA",
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        "defects": [
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    "assignerShortName": "cisco",
    "cveId": "CVE-2026-20084",
    "datePublished": "2026-03-25T16:02:39.119Z",
    "dateReserved": "2025-10-08T11:59:15.366Z",
    "dateUpdated": "2026-03-26T17:35:50.008Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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\"version\": \"17.2.1a\"}, {\"status\": \"affected\", \"version\": \"17.3.1\"}, {\"status\": \"affected\", \"version\": \"17.3.2\"}, {\"status\": \"affected\", \"version\": \"17.3.3\"}, {\"status\": \"affected\", \"version\": \"17.3.2a\"}, {\"status\": \"affected\", \"version\": \"17.3.4\"}, {\"status\": \"affected\", \"version\": \"17.3.5\"}, {\"status\": \"affected\", \"version\": \"17.3.6\"}, {\"status\": \"affected\", \"version\": \"17.3.7\"}, {\"status\": \"affected\", \"version\": \"17.3.8\"}, {\"status\": \"affected\", \"version\": \"17.3.8a\"}, {\"status\": \"affected\", \"version\": \"17.4.1\"}, {\"status\": \"affected\", \"version\": \"17.5.1\"}, {\"status\": \"affected\", \"version\": \"17.6.1\"}, {\"status\": \"affected\", \"version\": \"17.6.2\"}, {\"status\": \"affected\", \"version\": \"17.6.3\"}, {\"status\": \"affected\", \"version\": \"17.6.1y\"}, {\"status\": \"affected\", \"version\": \"17.6.4\"}, {\"status\": \"affected\", \"version\": \"17.6.5\"}, {\"status\": \"affected\", \"version\": \"17.6.6\"}, {\"status\": \"affected\", \"version\": \"17.6.6a\"}, {\"status\": \"affected\", \"version\": \"17.6.5a\"}, {\"status\": \"affected\", \"version\": \"17.6.7\"}, {\"status\": \"affected\", \"version\": \"17.6.8\"}, {\"status\": \"affected\", \"version\": \"17.7.1\"}, {\"status\": \"affected\", \"version\": \"17.10.1\"}, {\"status\": \"affected\", \"version\": \"17.10.1b\"}, {\"status\": \"affected\", \"version\": \"17.8.1\"}, {\"status\": \"affected\", \"version\": \"17.9.1\"}, {\"status\": \"affected\", \"version\": \"17.9.2\"}, {\"status\": \"affected\", \"version\": \"17.9.3\"}, {\"status\": \"affected\", \"version\": \"17.9.4\"}, {\"status\": \"affected\", \"version\": \"17.9.5\"}, {\"status\": \"affected\", \"version\": \"17.9.4a\"}, {\"status\": \"affected\", \"version\": \"17.9.6\"}, {\"status\": \"affected\", \"version\": \"17.9.6a\"}, {\"status\": \"affected\", \"version\": \"17.9.7\"}, {\"status\": \"affected\", \"version\": \"17.9.8\"}, {\"status\": \"affected\", \"version\": \"17.11.1\"}, {\"status\": \"affected\", \"version\": \"17.12.1\"}, {\"status\": \"affected\", \"version\": \"17.12.2\"}, {\"status\": \"affected\", \"version\": \"17.12.3\"}, {\"status\": \"affected\", \"version\": \"17.12.4\"}, {\"status\": \"affected\", \"version\": \"17.12.5\"}, {\"status\": \"affected\", \"version\": \"17.12.1z5\"}, {\"status\": \"affected\", \"version\": \"17.13.1\"}, {\"status\": \"affected\", \"version\": \"17.14.1\"}, {\"status\": \"affected\", \"version\": \"17.15.1\"}, {\"status\": \"affected\", \"version\": \"17.15.2\"}, {\"status\": \"affected\", \"version\": \"17.15.3\"}, {\"status\": \"affected\", \"version\": \"17.15.2b\"}, {\"status\": \"affected\", \"version\": \"17.15.4\"}, {\"status\": \"affected\", \"version\": \"17.15.4d\"}, {\"status\": \"affected\", \"version\": \"17.16.1\"}, {\"status\": \"affected\", \"version\": \"17.17.1\"}, {\"status\": \"affected\", \"version\": \"17.18.1\"}]}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-bootp-WuBhNBxA\", \"name\": \"cisco-sa-bootp-WuBhNBxA\"}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the DHCP snooping feature of Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause BOOTP packets to be forwarded between VLANs, resulting in a denial of service (DoS) condition. \\r\\n\\r This vulnerability is due to improper handling of BOOTP packets on Cisco Catalyst 9000 Series Switches. An attacker could exploit this vulnerability by sending BOOTP request packets to an affected device. A successful exploit could allow an attacker to forward BOOTP packets from one VLAN to another, resulting in BOOTP VLAN leakage and potentially leading to high CPU utilization. This makes the device unreachable (either through console or remote management) and unable to forward traffic, resulting in a DoS condition. \\r\\n\\r Note: This vulnerability can be exploited with either unicast or broadcast BOOTP packets.\\r\\n\\r   There are workarounds that address this vulnerability.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"cwe\", \"cweId\": \"CWE-400\", \"description\": \"Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-03-25T16:02:39.119Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-20084\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-03-26T17:35:50.008Z\", \"dateReserved\": \"2025-10-08T11:59:15.366Z\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"datePublished\": \"2026-03-25T16:02:39.119Z\", \"assignerShortName\": \"cisco\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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