FKIE_CVE-2021-1377

Vulnerability from fkie_nvd - Published: 2021-03-24 20:15 - Updated: 2026-06-17 03:31
Severity
5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
5.8 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Summary
A vulnerability in Address Resolution Protocol (ARP) management of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to prevent an affected device from resolving ARP entries for legitimate hosts on the connected subnets. This vulnerability exists because ARP entries are mismanaged. An attacker could exploit this vulnerability by continuously sending traffic that results in incomplete ARP entries. A successful exploit could allow the attacker to cause ARP requests on the device to be unsuccessful for legitimate hosts, resulting in a denial of service (DoS) condition.
References
psirt@cisco.comhttps://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-arp-mtfhBfjEVendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-arp-mtfhBfjEVendor Advisory
Impacted products
Vendor Product Version
cisco ios 12.2\(6\)i1
cisco ios 15.1\(3\)svr1
cisco ios 15.1\(3\)svr2
cisco ios 15.1\(3\)svr3
cisco ios 15.1\(3\)svs
cisco ios 15.1\(3\)svs1
cisco ios 15.2\(2\)e6
cisco ios 15.2\(2\)e7
cisco ios 15.2\(2\)e7b
cisco ios 15.2\(2\)e8
cisco ios 15.2\(2\)e9
cisco ios 15.2\(2\)e9a
cisco ios 15.2\(2\)e10
cisco ios 15.2\(3\)e5
cisco ios 15.2\(4\)e4
cisco ios 15.2\(4\)e5
cisco ios 15.2\(4\)e5a
cisco ios 15.2\(4\)e6
cisco ios 15.2\(4\)e7
cisco ios 15.2\(4\)e8
cisco ios 15.2\(4\)e9
cisco ios 15.2\(4\)e10
cisco ios 15.2\(4\)e10a
cisco ios 15.2\(4\)ea6
cisco ios 15.2\(4\)ea7
cisco ios 15.2\(4\)ea8
cisco ios 15.2\(4\)ea9
cisco ios 15.2\(4\)ea9a
cisco ios 15.2\(4\)ea10
cisco ios 15.2\(5\)e1
cisco ios 15.2\(5\)e2
cisco ios 15.2\(5\)e2b
cisco ios 15.2\(5\)e2c
cisco ios 15.2\(5\)ex
cisco ios 15.2\(5a\)e1
cisco ios 15.2\(6\)e
cisco ios 15.2\(6\)e0a
cisco ios 15.2\(6\)e0c
cisco ios 15.2\(6\)e1
cisco ios 15.2\(6\)e1a
cisco ios 15.2\(6\)e1s
cisco ios 15.2\(6\)e2
cisco ios 15.2\(6\)e2a
cisco ios 15.2\(6\)e2b
cisco ios 15.2\(6\)e3
cisco ios 15.2\(6\)eb
cisco ios 15.2\(7\)e
cisco ios 15.2\(7\)e0a
cisco ios 15.2\(7\)e0b
cisco ios 15.2\(7\)e0s
cisco ios 15.2\(7\)e1
cisco ios 15.2\(7\)e1a
cisco ios 15.2\(7\)e2
cisco ios 15.2\(7\)e2a
cisco ios 15.2\(7\)e2b
cisco ios 15.2\(7\)e3
cisco ios 15.2\(7a\)e0b
cisco ios 15.2\(7b\)e0b
cisco ios 15.3\(3\)jpc97
cisco ios 15.4\(1\)sy
cisco ios 15.4\(1\)sy1
cisco ios 15.4\(1\)sy2
cisco ios 15.4\(1\)sy3
cisco ios 15.4\(1\)sy4
cisco ios 15.5\(1\)sy
cisco ios 15.5\(1\)sy1
cisco ios 15.5\(1\)sy2
cisco ios 15.5\(1\)sy3
cisco ios 15.5\(1\)sy4
cisco ios 15.5\(1\)sy5
cisco ios 15.5\(1\)sy6
cisco ios 15.5\(3\)m4
cisco ios 15.5\(3\)m4a
cisco ios 15.5\(3\)m4b
cisco ios 15.5\(3\)m4c
cisco ios 15.5\(3\)m5
cisco ios 15.5\(3\)m6
cisco ios 15.5\(3\)m6a
cisco ios 15.5\(3\)m7
cisco ios 15.5\(3\)m8
cisco ios 15.5\(3\)m9
cisco ios 15.5\(3\)m10
cisco ios 15.5\(3\)m11
cisco ios 15.5\(3\)s4
cisco ios 15.5\(3\)s5
cisco ios 15.5\(3\)s6
cisco ios 15.5\(3\)s6a
cisco ios 15.5\(3\)s6b
cisco ios 15.5\(3\)s7
cisco ios 15.5\(3\)s8
cisco ios 15.5\(3\)s9
cisco ios 15.5\(3\)s9a
cisco ios 15.5\(3\)s10
cisco ios 15.5\(3\)s10a
cisco ios 15.6\(3\)m2
cisco ios 15.6\(3\)m2a
cisco ios 15.6\(3\)m3
cisco ios 15.6\(3\)m3a
cisco ios 15.6\(3\)m4
cisco ios 15.6\(3\)m5
cisco ios 15.6\(3\)m6
cisco ios 15.6\(3\)m6a
cisco ios 15.6\(3\)m6b
cisco ios 15.6\(3\)m7
cisco ios 15.6\(3\)m8
cisco ios 15.6\(3\)m9
cisco ios 15.7\(3\)m
cisco ios 15.7\(3\)m0a
cisco ios 15.7\(3\)m1
cisco ios 15.7\(3\)m2
cisco ios 15.7\(3\)m3
cisco ios 15.7\(3\)m4
cisco ios 15.7\(3\)m4a
cisco ios 15.7\(3\)m4b
cisco ios 15.7\(3\)m5
cisco ios 15.7\(3\)m6
cisco ios 15.7\(3\)m7
cisco ios 15.8\(3\)m
cisco ios 15.8\(3\)m0a
cisco ios 15.8\(3\)m0b
cisco ios 15.8\(3\)m1
cisco ios 15.8\(3\)m1a
cisco ios 15.8\(3\)m2
cisco ios 15.8\(3\)m2a
cisco ios 15.8\(3\)m3
cisco ios 15.8\(3\)m3a
cisco ios 15.8\(3\)m3b
cisco ios 15.8\(3\)m4
cisco ios 15.8\(3\)m5
cisco ios 15.9\(3\)m
cisco ios 15.9\(3\)m0a
cisco ios 15.9\(3\)m1
cisco ios 15.9\(3\)m2
cisco ios 15.9\(3\)m2a
cisco ios_xe 3.6.6e
cisco ios_xe 3.6.7ae
cisco ios_xe 3.6.7be
cisco ios_xe 3.6.7e
cisco ios_xe 3.6.8e
cisco ios_xe 3.6.9ae
cisco ios_xe 3.6.9e
cisco ios_xe 3.6.10e
cisco ios_xe 3.7.5e
cisco ios_xe 3.8.4e
cisco ios_xe 3.8.5ae
cisco ios_xe 3.8.5e
cisco ios_xe 3.8.6e
cisco ios_xe 3.8.7e
cisco ios_xe 3.8.8e
cisco ios_xe 3.8.9e
cisco ios_xe 3.8.10e
cisco ios_xe 3.9.1e
cisco ios_xe 3.9.2be
cisco ios_xe 3.9.2e
cisco ios_xe 3.10.0ce
cisco ios_xe 3.10.0e
cisco ios_xe 3.10.1ae
cisco ios_xe 3.10.1e
cisco ios_xe 3.10.1se
cisco ios_xe 3.10.2e
cisco ios_xe 3.10.3e
cisco ios_xe 3.11.0e
cisco ios_xe 3.11.1ae
cisco ios_xe 3.11.1e
cisco ios_xe 3.11.2ae
cisco ios_xe 3.11.2e
cisco ios_xe 3.11.3ae
cisco ios_xe 3.11.3e
cisco ios_xe 3.16.4as
cisco ios_xe 3.16.4bs
cisco ios_xe 3.16.4cs
cisco ios_xe 3.16.4ds
cisco ios_xe 3.16.4es
cisco ios_xe 3.16.4gs
cisco ios_xe 3.16.4s
cisco ios_xe 3.16.5as
cisco ios_xe 3.16.5bs
cisco ios_xe 3.16.5s
cisco ios_xe 3.16.6bs
cisco ios_xe 3.16.6s
cisco ios_xe 3.16.7as
cisco ios_xe 3.16.7bs
cisco ios_xe 3.16.7s
cisco ios_xe 3.16.8s
cisco ios_xe 3.16.9s
cisco ios_xe 3.16.10as
cisco ios_xe 3.16.10s
cisco ios_xe 16.3.2
cisco ios_xe 16.3.3
cisco ios_xe 16.3.4
cisco ios_xe 16.3.5
cisco ios_xe 16.3.5b
cisco ios_xe 16.3.6
cisco ios_xe 16.3.7
cisco ios_xe 16.3.8
cisco ios_xe 16.3.9
cisco ios_xe 16.3.10
cisco ios_xe 16.3.11
cisco ios_xe 16.4.1
cisco ios_xe 16.4.2
cisco ios_xe 16.4.3
cisco ios_xe 16.5.1
cisco ios_xe 16.5.1a
cisco ios_xe 16.5.1b
cisco ios_xe 16.5.2
cisco ios_xe 16.5.3
cisco ios_xe 16.6.1
cisco ios_xe 16.6.2
cisco ios_xe 16.6.3
cisco ios_xe 16.6.4
cisco ios_xe 16.6.4a
cisco ios_xe 16.6.4s
cisco ios_xe 16.6.5
cisco ios_xe 16.6.5a
cisco ios_xe 16.6.5b
cisco ios_xe 16.6.6
cisco ios_xe 16.6.7
cisco ios_xe 16.6.7a
cisco ios_xe 16.6.8
cisco ios_xe 16.7.1
cisco ios_xe 16.7.1a
cisco ios_xe 16.7.1b
cisco ios_xe 16.7.2
cisco ios_xe 16.7.3
cisco ios_xe 16.7.4
cisco ios_xe 16.8.1
cisco ios_xe 16.8.1a
cisco ios_xe 16.8.1b
cisco ios_xe 16.8.1c
cisco ios_xe 16.8.1d
cisco ios_xe 16.8.1e
cisco ios_xe 16.8.1s
cisco ios_xe 16.8.2
cisco ios_xe 16.8.3
cisco ios_xe 16.9.1
cisco ios_xe 16.9.1a
cisco ios_xe 16.9.1b
cisco ios_xe 16.9.1c
cisco ios_xe 16.9.1d
cisco ios_xe 16.9.1s
cisco ios_xe 16.9.2
cisco ios_xe 16.9.2a
cisco ios_xe 16.9.2s
cisco ios_xe 16.9.3
cisco ios_xe 16.9.3a
cisco ios_xe 16.9.3h
cisco ios_xe 16.9.3s
cisco ios_xe 16.9.4
cisco ios_xe 16.9.4c
cisco ios_xe 16.9.5
cisco ios_xe 16.9.5f
cisco ios_xe 16.9.6
cisco ios_xe 16.10.1
cisco ios_xe 16.10.1a
cisco ios_xe 16.10.1b
cisco ios_xe 16.10.1c
cisco ios_xe 16.10.1d
cisco ios_xe 16.10.1e
cisco ios_xe 16.10.1f
cisco ios_xe 16.10.1g
cisco ios_xe 16.10.1s
cisco ios_xe 16.10.2
cisco ios_xe 16.10.3
cisco ios_xe 16.11.1
cisco ios_xe 16.11.1a
cisco ios_xe 16.11.1b
cisco ios_xe 16.11.1c
cisco ios_xe 16.11.1s
cisco ios_xe 16.11.2
cisco ios_xe 16.12.1
cisco ios_xe 16.12.1a
cisco ios_xe 16.12.1c
cisco ios_xe 16.12.1s
cisco ios_xe 16.12.1t
cisco ios_xe 16.12.1w
cisco ios_xe 16.12.1x
cisco ios_xe 16.12.1y
cisco ios_xe 16.12.1z
cisco ios_xe 16.12.2
cisco ios_xe 16.12.2a
cisco ios_xe 16.12.2s
cisco ios_xe 16.12.2t
cisco ios_xe 16.12.3
cisco ios_xe 16.12.3a
cisco ios_xe 16.12.3s
cisco ios_xe 16.12.4
cisco ios_xe 16.12.4a
cisco ios_xe 17.1.1
cisco ios_xe 17.1.1a
cisco ios_xe 17.1.1s
cisco ios_xe 17.1.1t
cisco ios_xe 17.1.2
cisco ios_xe 17.2.1
cisco ios_xe 17.2.1a
cisco ios_xe 17.2.1r
cisco ios_xe 17.2.1v
cisco ios_xe 17.2.2
cisco ios_xe 17.3.1
cisco ios_xe 17.3.1a
cisco ios_xe 17.3.1w
cisco ios_xe 17.3.2
cisco ios_xe 17.3.2a
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Cisco IOS",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "source": "psirt@cisco.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
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              "criteria": "cpe:2.3:o:cisco:ios:12.2\\(6\\)i1:*:*:*:*:*:*:*",
              "matchCriteriaId": "BEAFD220-48D7-46EE-8537-A69C5F8D0F2D",
              "vulnerable": true
            },
            {
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              "matchCriteriaId": "806D2FF1-EADA-44C8-94BD-6BC18D138150",
              "vulnerable": true
            },
            {
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            },
            {
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              "matchCriteriaId": "1360069D-0358-4746-8C3F-44C2A40988D7",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in Address Resolution Protocol (ARP) management of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to prevent an affected device from resolving ARP entries for legitimate hosts on the connected subnets. This vulnerability exists because ARP entries are mismanaged. An attacker could exploit this vulnerability by continuously sending traffic that results in incomplete ARP entries. A successful exploit could allow the attacker to cause ARP requests on the device to be unsuccessful for legitimate hosts, resulting in a denial of service (DoS) condition."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad en la administraci\u00f3n del Address Resolution Protocol (ARP) del Software Cisco IOS y el Software Cisco IOS XE, podr\u00eda permitir a un atacante remoto no autenticado impedir que un dispositivo afectado resuelva entradas ARP para hosts leg\u00edtimos en las subredes conectadas.\u0026#xa0;Esta vulnerabilidad se presenta porque las entradas ARP son mal administradas.\u0026#xa0;Un atacante podr\u00eda explotar esta vulnerabilidad mediante el env\u00edo de tr\u00e1fico continuamente que da como resultado entradas ARP incompletas.\u0026#xa0;Una explotaci\u00f3n con \u00e9xito podr\u00eda permitir al atacante causar que las peticiones ARP en el dispositivo no sean exitosas para hosts leg\u00edtimos, lo que resultar\u00eda en una condici\u00f3n de denegaci\u00f3n de servicio (DoS)"
    }
  ],
  "id": "CVE-2021-1377",
  "lastModified": "2026-06-17T03:31:37.930",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "NONE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.0,
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 10.0,
        "impactScore": 2.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "psirt@cisco.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 5.8,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-1377",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-11-08T20:03:03.184699Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2021-03-24T20:15:13.150",
  "references": [
    {
      "source": "psirt@cisco.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-arp-mtfhBfjE"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-arp-mtfhBfjE"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-399"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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