CVE-2021-23017 (GCVE-0-2021-23017)

Vulnerability from cvelistv5 – Published: 2021-06-01 12:28 – Updated: 2024-08-03 18:58
VLAI
Summary
A security issue in nginx resolver was identified, which might allow an attacker who is able to forge UDP packets from the DNS server to cause 1-byte memory overwrite, resulting in worker process crash or potential other impact.
Severity
7.7 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
CWE
Assigner
f5 CNA under the mitre root
CNA scorecard B 84/100 over 87 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
n/a Nginx Web Server, Nginx Plus Affected: Nginx Web Server versions 0.6.18 thru 1.20.0 before 1.20.1, Nginx plus versions R13 thru R23 before R23 P1. Nginx plus version R24 before R24 P1
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        ],
        "sourceIdentifier": "f5sirt@f5.com",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-193"
              }
            ],
            "source": "f5sirt@f5.com",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-193"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-04T08:47:14+00:00",
      "cve": "CVE-2021-23017",
      "id": "CVE-2021-23017",
      "initial_release_date": "2021-05-25T00:00:00+00:00",
      "product_status:fixed": "403",
      "product_status:known_affected": "10",
      "product_status:known_not_affected": "11",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-23017.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-08-31T02:07:23Z",
      "cve": "CVE-2021-23017",
      "id": "CVE-2021-23017",
      "initial_release_date": "2023-02-15T03:45:43Z",
      "product_status:recommended": "103",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-23017",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-23017.json",
      "version": "18"
    }
  }
}



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