Vulnerability-Lookup

CVE-2026-20121 (GCVE-0-2026-20121)

Vulnerability from cvelistv5 – Published: 2026-09-16 20:24 – Updated: 2026-09-17 15:56

Title

CIsco FTD Bypass Access List

Summary

A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured access controls. This vulnerability is due to a logic error in populating group access control policies (ACPs) with OGS configured. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks.

Severity

5.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-17 15:56 UTC

CWE

CWE-284 - Improper Access Control

Assigner

cisco mitre root

References

1 reference

URL	Tags
https://sec.cloudapps.cisco.com/security/center/c…

Impacted products

2 products

Vendor	Product	Version	CPE status
Cisco	Cisco Secure Firewall Adaptive Security Appliance (ASA) Software	Affected: 9.23.1 Affected: 9.22.1.1 Affected: 9.22.1.3 Affected: 9.22.1.2 Affected: 9.22.1.6 Affected: 9.22.2 Affected: 9.23.1.3 Affected: 9.22.2.4 Affected: 9.23.1.7 Affected: 9.22.2.9 Affected: 9.23.1.13 Affected: 9.22.2.13 Affected: 9.23.1.19 Affected: 9.22.2.14 Affected: 9.23.1.22 Affected: 9.22.2.20	guessed
Cisco	Cisco Secure Firewall Threat Defense (FTD) Software	Affected: 7.6.0 Affected: 7.7.0 Affected: 7.6.1 Affected: 7.6.2 Affected: 7.7.10 Affected: 7.7.11 Affected: 7.6.2.1 Affected: 7.7.10.1	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-20121",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-17T15:56:35.178454Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-09-17T15:56:48.183Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "product": "Cisco Secure Firewall Adaptive Security Appliance (ASA) Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "9.23.1"
            },
            {
              "status": "affected",
              "version": "9.22.1.1"
            },
            {
              "status": "affected",
              "version": "9.22.1.3"
            },
            {
              "status": "affected",
              "version": "9.22.1.2"
            },
            {
              "status": "affected",
              "version": "9.22.1.6"
            },
            {
              "status": "affected",
              "version": "9.22.2"
            },
            {
              "status": "affected",
              "version": "9.23.1.3"
            },
            {
              "status": "affected",
              "version": "9.22.2.4"
            },
            {
              "status": "affected",
              "version": "9.23.1.7"
            },
            {
              "status": "affected",
              "version": "9.22.2.9"
            },
            {
              "status": "affected",
              "version": "9.23.1.13"
            },
            {
              "status": "affected",
              "version": "9.22.2.13"
            },
            {
              "status": "affected",
              "version": "9.23.1.19"
            },
            {
              "status": "affected",
              "version": "9.22.2.14"
            },
            {
              "status": "affected",
              "version": "9.23.1.22"
            },
            {
              "status": "affected",
              "version": "9.22.2.20"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "Cisco Secure Firewall Threat Defense (FTD) Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "7.6.0"
            },
            {
              "status": "affected",
              "version": "7.7.0"
            },
            {
              "status": "affected",
              "version": "7.6.1"
            },
            {
              "status": "affected",
              "version": "7.6.2"
            },
            {
              "status": "affected",
              "version": "7.7.10"
            },
            {
              "status": "affected",
              "version": "7.7.11"
            },
            {
              "status": "affected",
              "version": "7.6.2.1"
            },
            {
              "status": "affected",
              "version": "7.7.10.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured access controls.\r\n\r\nThis vulnerability is due to a logic error in populating group access control policies (ACPs) with OGS configured. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C",
            "version": "3.1"
          },
          "format": "cvssV3_1"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-284",
              "description": "Improper Access Control",
              "lang": "en",
              "type": "cwe"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-16T20:24:54.360Z",
        "orgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
        "shortName": "cisco"
      },
      "references": [
        {
          "name": "cisco-sa-ftd-acl-bypass-8p6vFvw",
          "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-acl-bypass-8p6vFvw"
        }
      ],
      "source": {
        "advisory": "cisco-sa-ftd-acl-bypass-8p6vFvw",
        "defects": [
          "CSCwr49050"
        ],
        "discovery": "EXTERNAL"
      },
      "title": "CIsco FTD Bypass Access List"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "d1c1063e-7a18-46af-9102-31f8928bc633",
    "assignerShortName": "cisco",
    "cveId": "CVE-2026-20121",
    "datePublished": "2026-09-16T20:24:54.360Z",
    "dateReserved": "2025-10-08T11:59:15.377Z",
    "dateUpdated": "2026-09-17T15:56:48.183Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-20121",
      "date": "2026-09-17",
      "epss": "0.00487",
      "percentile": "0.40849"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-20121\",\"sourceIdentifier\":\"psirt@cisco.com\",\"published\":\"2026-09-16T21:17:07.467\",\"lastModified\":\"2026-09-17T16:17:23.800\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured access controls.\\r\\n\\r\\nThis vulnerability is due to a logic error in populating group access control policies (ACPs) with OGS configured. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks.\"}],\"affected\":[{\"source\":\"psirt@cisco.com\",\"affectedData\":[{\"vendor\":\"Cisco\",\"product\":\"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"9.23.1\",\"status\":\"affected\"},{\"version\":\"9.22.1.1\",\"status\":\"affected\"},{\"version\":\"9.22.1.3\",\"status\":\"affected\"},{\"version\":\"9.22.1.2\",\"status\":\"affected\"},{\"version\":\"9.22.1.6\",\"status\":\"affected\"},{\"version\":\"9.22.2\",\"status\":\"affected\"},{\"version\":\"9.23.1.3\",\"status\":\"affected\"},{\"version\":\"9.22.2.4\",\"status\":\"affected\"},{\"version\":\"9.23.1.7\",\"status\":\"affected\"},{\"version\":\"9.22.2.9\",\"status\":\"affected\"},{\"version\":\"9.23.1.13\",\"status\":\"affected\"},{\"version\":\"9.22.2.13\",\"status\":\"affected\"},{\"version\":\"9.23.1.19\",\"status\":\"affected\"},{\"version\":\"9.22.2.14\",\"status\":\"affected\"},{\"version\":\"9.23.1.22\",\"status\":\"affected\"},{\"version\":\"9.22.2.20\",\"status\":\"affected\"}]},{\"vendor\":\"Cisco\",\"product\":\"Cisco Secure Firewall Threat Defense (FTD) Software\",\"defaultStatus\":\"unknown\",\"versions\":[{\"version\":\"7.6.0\",\"status\":\"affected\"},{\"version\":\"7.7.0\",\"status\":\"affected\"},{\"version\":\"7.6.1\",\"status\":\"affected\"},{\"version\":\"7.6.2\",\"status\":\"affected\"},{\"version\":\"7.7.10\",\"status\":\"affected\"},{\"version\":\"7.7.11\",\"status\":\"affected\"},{\"version\":\"7.6.2.1\",\"status\":\"affected\"},{\"version\":\"7.7.10.1\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N\",\"baseScore\":5.3,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":1.4}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-09-17T15:56:35.178454Z\",\"id\":\"CVE-2026-20121\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"yes\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"psirt@cisco.com\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-284\"}]}],\"references\":[{\"url\":\"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-acl-bypass-8p6vFvw\",\"source\":\"psirt@cisco.com\"}]}}",
    "vulnrichment": {
      "containers": "{\"cna\": {\"title\": \"CIsco FTD Bypass Access List\", \"metrics\": [{\"format\": \"cvssV3_1\", \"cvssV3_1\": {\"version\": \"3.1\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:P/RL:O/RC:C\", \"baseScore\": 5.3, \"baseSeverity\": \"MEDIUM\", \"attackVector\": \"NETWORK\", \"attackComplexity\": \"LOW\", \"privilegesRequired\": \"NONE\", \"userInteraction\": \"NONE\", \"scope\": \"UNCHANGED\", \"confidentialityImpact\": \"NONE\", \"integrityImpact\": \"LOW\", \"availabilityImpact\": \"NONE\"}}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured access controls.\\r\\n\\r\\nThis vulnerability is due to a logic error in populating group access control policies (ACPs) with OGS configured. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks.\"}], \"references\": [{\"url\": \"https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-acl-bypass-8p6vFvw\", \"name\": \"cisco-sa-ftd-acl-bypass-8p6vFvw\"}], \"exploits\": [{\"lang\": \"en\", \"value\": \"The Cisco Product Security Incident Response Team (PSIRT) is not aware of any public announcements or malicious use of the vulnerabilities that are described in this advisory.\"}], \"source\": {\"advisory\": \"cisco-sa-ftd-acl-bypass-8p6vFvw\", \"discovery\": \"EXTERNAL\", \"defects\": [\"CSCwr49050\"]}, \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"description\": \"Improper Access Control\", \"type\": \"cwe\", \"cweId\": \"CWE-284\"}]}], \"affected\": [{\"vendor\": \"Cisco\", \"product\": \"Cisco Secure Firewall Adaptive Security Appliance (ASA) Software\", \"versions\": [{\"version\": \"9.23.1\", \"status\": \"affected\"}, {\"version\": \"9.22.1.1\", \"status\": \"affected\"}, {\"version\": \"9.22.1.3\", \"status\": \"affected\"}, {\"version\": \"9.22.1.2\", \"status\": \"affected\"}, {\"version\": \"9.22.1.6\", \"status\": \"affected\"}, {\"version\": \"9.22.2\", \"status\": \"affected\"}, {\"version\": \"9.23.1.3\", \"status\": \"affected\"}, {\"version\": \"9.22.2.4\", \"status\": \"affected\"}, {\"version\": \"9.23.1.7\", \"status\": \"affected\"}, {\"version\": \"9.22.2.9\", \"status\": \"affected\"}, {\"version\": \"9.23.1.13\", \"status\": \"affected\"}, {\"version\": \"9.22.2.13\", \"status\": \"affected\"}, {\"version\": \"9.23.1.19\", \"status\": \"affected\"}, {\"version\": \"9.22.2.14\", \"status\": \"affected\"}, {\"version\": \"9.23.1.22\", \"status\": \"affected\"}, {\"version\": \"9.22.2.20\", \"status\": \"affected\"}], \"defaultStatus\": \"unknown\"}, {\"vendor\": \"Cisco\", \"product\": \"Cisco Secure Firewall Threat Defense (FTD) Software\", \"versions\": [{\"version\": \"7.6.0\", \"status\": \"affected\"}, {\"version\": \"7.7.0\", \"status\": \"affected\"}, {\"version\": \"7.6.1\", \"status\": \"affected\"}, {\"version\": \"7.6.2\", \"status\": \"affected\"}, {\"version\": \"7.7.10\", \"status\": \"affected\"}, {\"version\": \"7.7.11\", \"status\": \"affected\"}, {\"version\": \"7.6.2.1\", \"status\": \"affected\"}, {\"version\": \"7.7.10.1\", \"status\": \"affected\"}], \"defaultStatus\": \"unknown\"}], \"providerMetadata\": {\"orgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"shortName\": \"cisco\", \"dateUpdated\": \"2026-09-16T20:24:54.360Z\"}}, \"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-20121\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-09-17T15:56:35.178454Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-09-17T15:56:42.947Z\"}}]}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-20121\", \"assignerOrgId\": \"d1c1063e-7a18-46af-9102-31f8928bc633\", \"state\": \"PUBLISHED\", \"assignerShortName\": \"cisco\", \"dateReserved\": \"2025-10-08T11:59:15.377Z\", \"datePublished\": \"2026-09-16T20:24:54.360Z\", \"dateUpdated\": \"2026-09-17T15:56:48.183Z\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-20121

Vulnerability from fkie_nvd - Published: 2026-09-16 21:17 - Updated: 2026-09-16 21:17

Severity

5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Summary

References

	URL	Tags
	psirt@cisco.com	https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-acl-bypass-8p6vFvw

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unknown",
          "product": "Cisco Secure Firewall Adaptive Security Appliance (ASA) Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "9.23.1"
            },
            {
              "status": "affected",
              "version": "9.22.1.1"
            },
            {
              "status": "affected",
              "version": "9.22.1.3"
            },
            {
              "status": "affected",
              "version": "9.22.1.2"
            },
            {
              "status": "affected",
              "version": "9.22.1.6"
            },
            {
              "status": "affected",
              "version": "9.22.2"
            },
            {
              "status": "affected",
              "version": "9.23.1.3"
            },
            {
              "status": "affected",
              "version": "9.22.2.4"
            },
            {
              "status": "affected",
              "version": "9.23.1.7"
            },
            {
              "status": "affected",
              "version": "9.22.2.9"
            },
            {
              "status": "affected",
              "version": "9.23.1.13"
            },
            {
              "status": "affected",
              "version": "9.22.2.13"
            },
            {
              "status": "affected",
              "version": "9.23.1.19"
            },
            {
              "status": "affected",
              "version": "9.22.2.14"
            },
            {
              "status": "affected",
              "version": "9.23.1.22"
            },
            {
              "status": "affected",
              "version": "9.22.2.20"
            }
          ]
        },
        {
          "defaultStatus": "unknown",
          "product": "Cisco Secure Firewall Threat Defense (FTD) Software",
          "vendor": "Cisco",
          "versions": [
            {
              "status": "affected",
              "version": "7.6.0"
            },
            {
              "status": "affected",
              "version": "7.7.0"
            },
            {
              "status": "affected",
              "version": "7.6.1"
            },
            {
              "status": "affected",
              "version": "7.6.2"
            },
            {
              "status": "affected",
              "version": "7.7.10"
            },
            {
              "status": "affected",
              "version": "7.7.11"
            },
            {
              "status": "affected",
              "version": "7.6.2.1"
            },
            {
              "status": "affected",
              "version": "7.7.10.1"
            }
          ]
        }
      ],
      "source": "psirt@cisco.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured access controls.\r\n\r\nThis vulnerability is due to a logic error in populating group access control policies (ACPs) with OGS configured. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks."
    }
  ],
  "id": "CVE-2026-20121",
  "lastModified": "2026-09-16T21:17:07.467",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "LOW",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 1.4,
        "source": "psirt@cisco.com",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-09-16T21:17:07.467",
  "references": [
    {
      "source": "psirt@cisco.com",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-acl-bypass-8p6vFvw"
    }
  ],
  "sourceIdentifier": "psirt@cisco.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-284"
        }
      ],
      "source": "psirt@cisco.com",
      "type": "Primary"
    }
  ]
}

GHSA-9J5C-2GXV-8M6X

Vulnerability from github – Published: 2026-09-16 21:32 – Updated: 2026-09-16 21:32

Details

This vulnerability is due to a logic error in populating group access control policies (ACPs) with OGS configured. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks.

Severity

5.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-20121"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T21:17:07Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability in the access control list (ACL) Object Group Search (OGS) implementation of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass configured access controls.\n\nThis vulnerability is due to a logic error in populating group access control policies (ACPs) with OGS configured. An attacker could exploit this vulnerability by sending traffic that should be blocked through the device. A successful exploit could allow the attacker to bypass access controls and reach devices in protected networks.",
  "id": "GHSA-9j5c-2gxv-8m6x",
  "modified": "2026-09-16T21:32:48Z",
  "published": "2026-09-16T21:32:48Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-20121"
    },
    {
      "type": "WEB",
      "url": "https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-acl-bypass-8p6vFvw"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

CVE-2026-20121 (GCVE-0-2026-20121)

FKIE_CVE-2026-20121

GHSA-9J5C-2GXV-8M6X

Tags

Sightings

Nomenclature

Related by attack behaviour