FKIE_CVE-2023-20168

Vulnerability from fkie_nvd - Published: 2023-08-23 19:15 - Updated: 2026-06-17 05:29
Summary
A vulnerability in TACACS+ and RADIUS remote authentication for Cisco NX-OS Software could allow an unauthenticated, local attacker to cause an affected device to unexpectedly reload. This vulnerability is due to incorrect input validation when processing an authentication attempt if the directed request option is enabled for TACACS+ or RADIUS. An attacker could exploit this vulnerability by entering a crafted string at the login prompt of an affected device. A successful exploit could allow the attacker to cause the affected device to unexpectedly reload, resulting in a denial of service (DoS) condition.
Impacted products
Vendor Product Version
cisco nx-os 9.3\(11\)
cisco nx-os 10.2\(5\)
cisco nexus_3048 -
cisco nexus_31108pc-v -
cisco nexus_31108tc-v -
cisco nexus_31128pq -
cisco nexus_3132c-z -
cisco nexus_3132q-v -
cisco nexus_3132q-xl -
cisco nexus_3164q -
cisco nexus_3172pq -
cisco nexus_3172pq-xl -
cisco nexus_3172tq -
cisco nexus_3172tq-32t -
cisco nexus_3172tq-xl -
cisco nexus_3232 -
cisco nexus_3264c-e -
cisco nexus_3264q -
cisco nexus_3408-s -
cisco nexus_34180yc -
cisco nexus_34200yc-sm -
cisco nexus_3432d-s -
cisco nexus_3464c -
cisco nexus_3524 -
cisco nexus_3524-x -
cisco nexus_3524-xl -
cisco nexus_3548 -
cisco nexus_3548-x -
cisco nexus_3548-xl -
cisco nexus_36180yc-r -
cisco nexus_9232e -
cisco nexus_92348gc-x -
cisco nexus_9408 -
cisco nexus_9504 -
cisco nexus_9508 -
cisco nexus_9516 -
cisco nx-os -
cisco mds_9000 -
cisco mds_9100 -
cisco mds_9132t -
cisco mds_9134 -
cisco mds_9140 -
cisco mds_9148 -
cisco mds_9148s -
cisco mds_9148t -
cisco mds_9200 -
cisco mds_9216 -
cisco mds_9216a -
cisco mds_9216i -
cisco mds_9222i -
cisco mds_9250i -
cisco mds_9396s -
cisco mds_9396t -
cisco mds_9500 -
cisco mds_9506 -
cisco mds_9509 -
cisco mds_9513 -
cisco mds_9700 -
cisco mds_9706 -
cisco mds_9710 -
cisco mds_9718 -
cisco nexus_1000_virtual_edge -
cisco nexus_1000v -
cisco nexus_1000v -
cisco nexus_5500 -
cisco nexus_5548p -
cisco nexus_5548up -
cisco nexus_5596t -
cisco nexus_5596up -
cisco nexus_5600 -
cisco nexus_56128p -
cisco nexus_5624q -
cisco nexus_5648q -
cisco nexus_5672up -
cisco nexus_5672up-16g -
cisco nexus_5696q -
cisco nexus_6000 -
cisco nexus_6001 -
cisco nexus_6001p -
cisco nexus_6001t -
cisco nexus_6004 -
cisco nexus_6004x -
cisco nexus_7000 -
cisco nexus_7004 -
cisco nexus_7009 -
cisco nexus_7010 -
cisco nexus_7018 -

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Cisco NX-OS Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "4.2(1)SV1(4)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV1(4a)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV1(4b)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV1(5.1)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV1(5.1a)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV1(5.2)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV1(5.2b)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV2(1.1)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV2(1.1a)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV2(2.1)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV2(2.1a)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV2(2.2)"
            },
            {
              "status": "affected",
              "version": "4.2(1)SV2(2.3)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SM1(5.1)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SM1(5.2)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SM1(5.2a)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SM1(5.2b)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SM1(5.2c)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SM3(1.1)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SM3(1.1a)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SM3(1.1b)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SM3(1.1c)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SM3(2.1)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(1.4)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(1.1)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(1.3)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(1.5a)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(1.5b)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(1.6)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(1.10)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(1.15)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(2.1)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(2.5)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(2.8)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(3.1)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(1.2)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(1.4b)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(3.15)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(4.1)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(4.1a)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(4.1b)"
            },
            {
              "status": "affected",
              "version": "5.2(1)SV3(4.1c)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A3(1)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A3(2)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A3(4)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A4(1)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A4(2)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A4(3)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A4(4)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A4(5)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A4(6)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(1)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(1a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(2)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(2a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(3)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(3a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(4)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(4a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(5)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(5a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(5b)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(6)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(7)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A6(8)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A7(1)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A7(1a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A7(2)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A7(2a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(1)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(2)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(3)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(4)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(4a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(5)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(6)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(7)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(7a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(7b)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(8)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(9)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(10a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(10)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(11)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(11a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)A8(11b)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U2(1)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U2(2)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U2(3)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U2(4)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U2(5)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U2(6)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U3(1)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U3(2)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U3(3)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U3(4)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U3(5)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U3(6)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U3(7)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U3(8)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U3(9)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U4(1)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U4(2)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U4(3)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U4(4)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U5(1)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U5(2)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U5(3)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U5(4)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(1)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(2)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(3)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(4)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(5)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(6)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(7)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(8)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(1a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(2a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(3a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(4a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(5a)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(5b)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(5c)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(9)"
            },
            {
              "status": "affected",
              "version": "6.0(2)U6(10)"
            },
            {
              "status": "affected",
              "version": "6.2(2)"
            },
            {
              "status": "affected",
              "version": "6.2(2a)"
            },
            {
              "status": "affected",
              "version": "6.2(6)"
            },
            {
              "status": "affected",
              "version": "6.2(6b)"
            },
            {
              "status": "affected",
              "version": "6.2(8)"
            },
            {
              "status": "affected",
              "version": "6.2(8a)"
            },
            {
              "status": "affected",
              "version": "6.2(8b)"
            },
            {
              "status": "affected",
              "version": "6.2(10)"
            },
            {
              "status": "affected",
              "version": "6.2(12)"
            },
            {
              "status": "affected",
              "version": "6.2(18)"
            },
            {
              "status": "affected",
              "version": "6.2(16)"
            },
            {
              "status": "affected",
              "version": "6.2(14)"
            },
            {
              "status": "affected",
              "version": "6.2(6a)"
            },
            {
              "status": "affected",
              "version": "6.2(20)"
            },
            {
              "status": "affected",
              "version": "6.2(1)"
            },
            {
              "status": "affected",
              "version": "6.2(3)"
            },
            {
              "status": "affected",
              "version": "6.2(5)"
            },
            {
              "status": "affected",
              "version": "6.2(5a)"
            },
            {
              "status": "affected",
              "version": "6.2(5b)"
            },
            {
              "status": "affected",
              "version": "6.2(7)"
            },
            {
              "status": "affected",
              "version": "6.2(9)"
            },
            {
              "status": "affected",
              "version": "6.2(9a)"
            },
            {
              "status": "affected",
              "version": "6.2(9b)"
            },
            {
              "status": "affected",
              "version": "6.2(9c)"
            },
            {
              "status": "affected",
              "version": "6.2(11)"
            },
            {
              "status": "affected",
              "version": "6.2(11b)"
            },
            {
              "status": "affected",
              "version": "6.2(11c)"
            },
            {
              "status": "affected",
              "version": "6.2(11d)"
            },
            {
              "status": "affected",
              "version": "6.2(11e)"
            },
            {
              "status": "affected",
              "version": "6.2(13)"
            },
            {
              "status": "affected",
              "version": "6.2(13a)"
            },
            {
              "status": "affected",
              "version": "6.2(13b)"
            },
            {
              "status": "affected",
              "version": "6.2(15)"
            },
            {
              "status": "affected",
              "version": "6.2(17)"
            },
            {
              "status": "affected",
              "version": "6.2(19)"
            },
            {
              "status": "affected",
              "version": "6.2(21)"
            },
            {
              "status": "affected",
              "version": "6.2(23)"
            },
            {
              "status": "affected",
              "version": "6.2(20a)"
            },
            {
              "status": "affected",
              "version": "6.2(25)"
            },
            {
              "status": "affected",
              "version": "6.2(22)"
            },
            {
              "status": "affected",
              "version": "6.2(27)"
            },
            {
              "status": "affected",
              "version": "6.2(29)"
            },
            {
              "status": "affected",
              "version": "6.2(24)"
            },
            {
              "status": "affected",
              "version": "6.2(31)"
            },
            {
              "status": "affected",
              "version": "6.2(24a)"
            },
            {
              "status": "affected",
              "version": "6.2(33)"
            },
            {
              "status": "affected",
              "version": "7.0(3)F1(1)"
            },
            {
              "status": "affected",
              "version": "7.0(3)F2(1)"
            },
            {
              "status": "affected",
              "version": "7.0(3)F2(2)"
            },
            {
              "status": "affected",
              "version": "7.0(3)F3(1)"
            },
            {
              "status": "affected",
              "version": "7.0(3)F3(2)"
            },
            {
              "status": "affected",
              "version": "7.0(3)F3(3)"
            },
            {
              "status": "affected",
              "version": "7.0(3)F3(3a)"
            },
            {
              "status": "affected",
              "version": "7.0(3)F3(4)"
            },
            {
              "status": "affected",
              "version": "7.0(3)F3(3c)"
            },
            {
              "status": "affected",
              "version": "7.0(3)F3(5)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(2a)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(2b)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(2c)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(2d)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(2e)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(3)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(4)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(5)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(1)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(1a)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I2(2)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I3(1)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I4(1)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I4(2)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I4(3)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I4(4)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I4(5)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I4(6)"
            },
            {
              "status": "affected",
              "version": "7.0(3)I4(7)"
            },
            {
              "status": "affected",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in TACACS+ and RADIUS remote authentication for Cisco NX-OS Software could allow an unauthenticated, local attacker to cause an affected device to unexpectedly reload. This vulnerability is due to incorrect input validation when processing an authentication attempt if the directed request option is enabled for TACACS+ or RADIUS. An attacker could exploit this vulnerability by entering a crafted string at the login prompt of an affected device. A successful exploit could allow the attacker to cause the affected device to unexpectedly reload, resulting in a denial of service (DoS) condition. "
    }
  ],
  "id": "CVE-2023-20168",
  "lastModified": "2026-06-17T05:29:42.100",
  "metrics": {
    "cvssMetricV31": [
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "CHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
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          "attackVector": "LOCAL",
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        "source": "nvd@nist.gov",
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  "published": "2023-08-23T19:15:07.777",
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      "source": "psirt@cisco.com",
      "tags": [
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
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  ]
}


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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.

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Detection rules are retrieved from Rulezet.

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