Vulnerability-Lookup

CVE-2025-68151 (GCVE-0-2025-68151)

Vulnerability from cvelistv5 – Published: 2026-01-08 15:33 – Updated: 2026-01-08 15:50

Title

CoreDNS gRPC/HTTPS/HTTP3 servers lack resource limits, enabling DoS via unbounded connections and oversized messages

Summary

CoreDNS is a DNS server that chains plugins. Prior to version 1.14.0, multiple CoreDNS server implementations (gRPC, HTTPS, and HTTP/3) lack critical resource-limiting controls. An unauthenticated remote attacker can exhaust memory and degrade or crash the server by opening many concurrent connections, streams, or sending oversized request bodies. The issue is similar in nature to CVE-2025-47950 (QUIC DoS) but affects additional server types that do not enforce connection limits, stream limits, or message size constraints. Version 1.14.0 contains a patch.

Severity ?

6.6 (Medium)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

GitHub_M

References

URL

Tags

	https://github.com/coredns/coredns/security/advis…	x_refsource_CONFIRM
	https://github.com/coredns/coredns/pull/7490	x_refsource_MISC
	https://github.com/coredns/coredns/commit/0d8cbb1…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	coredns	coredns	Affected: < 1.14.0

Show details on NVD website

JSON

To clipboard

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WID-SEC-W-2026-0047

Vulnerability from csaf_certbund - Published: 2026-01-07 23:00 - Updated: 2026-01-08 23:00

Summary

CoreDNS: Schwachstelle ermöglicht Denial of Service

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung

CoreDNS ist ein DNS server.

Angriff

Ein entfernter, anonymer Angreifer kann eine Schwachstelle in CoreDNS ausnutzen, um einen Denial of Service Angriff durchzuführen.

Betroffene Betriebssysteme

- Linux - UNIX

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "mittel"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "CoreDNS ist ein DNS server.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in CoreDNS ausnutzen, um einen Denial of Service Angriff durchzuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-0047 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0047.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-0047 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-0047"
      },
      {
        "category": "external",
        "summary": "GitHub Security Advisory GHSA-527x-5wrf-22m2 vom 2026-01-08",
        "url": "https://github.com/coredns/coredns/security/advisories/GHSA-527x-5wrf-22m2"
      }
    ],
    "source_lang": "en-US",
    "title": "CoreDNS: Schwachstelle erm\u00f6glicht Denial of Service",
    "tracking": {
      "current_release_date": "2026-01-08T23:00:00.000+00:00",
      "generator": {
        "date": "2026-01-09T07:30:27.496+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.5.0"
        }
      },
      "id": "WID-SEC-W-2026-0047",
      "initial_release_date": "2026-01-07T23:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-01-07T23:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-01-08T23:00:00.000+00:00",
          "number": "2",
          "summary": "Referenz(en) aufgenommen: EUVD-2026-1476"
        }
      ],
      "status": "final",
      "version": "2"
    }
  },
  "product_tree": {
    "branches": [
      {
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          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c1.14.0",
                "product": {
                  "name": "Open Source CoreDNS \u003c1.14.0",
                  "product_id": "T049787"
                }
              },
              {
                "category": "product_version",
                "name": "1.14.0",
                "product": {
                  "name": "Open Source CoreDNS 1.14.0",
                  "product_id": "T049787-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:coredns:coredns:1.14.0"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "CoreDNS"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-68151",
      "product_status": {
        "known_affected": [
          "T049787"
        ]
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      "release_date": "2026-01-07T23:00:00.000+00:00",
      "title": "CVE-2025-68151"
    }
  ]
}

FKIE_CVE-2025-68151

Vulnerability from fkie_nvd - Published: 2026-01-08 16:15 - Updated: 2026-01-08 18:08

Severity ?

6.6 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/coredns/coredns/commit/0d8cbb1a6bcb6bc9c1a489865278b8725fa20812
	security-advisories@github.com	https://github.com/coredns/coredns/pull/7490
	security-advisories@github.com	https://github.com/coredns/coredns/security/advisories/GHSA-527x-5wrf-22m2

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "CoreDNS is a DNS server that chains plugins. Prior to version 1.14.0, multiple CoreDNS server implementations (gRPC, HTTPS, and HTTP/3) lack critical resource-limiting controls. An unauthenticated remote attacker can exhaust memory and degrade or crash the server by opening many concurrent connections, streams, or sending oversized request bodies. The issue is similar in nature to CVE-2025-47950 (QUIC DoS) but affects additional server types that do not enforce connection limits, stream limits, or message size constraints. Version 1.14.0 contains a patch."
    }
  ],
  "id": "CVE-2025-68151",
  "lastModified": "2026-01-08T18:08:18.457",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 6.6,
          "baseSeverity": "MEDIUM",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "UNREPORTED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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  },
  "published": "2026-01-08T16:15:59.847",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/coredns/coredns/commit/0d8cbb1a6bcb6bc9c1a489865278b8725fa20812"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/coredns/coredns/pull/7490"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/coredns/coredns/security/advisories/GHSA-527x-5wrf-22m2"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-527X-5WRF-22M2

Vulnerability from github – Published: 2026-01-08 20:12 – Updated: 2026-01-08 20:12

Summary

CoreDNS gRPC/HTTPS/HTTP3 servers lack resource limits, enabling DoS via unbounded connections and oversized messages

Details

Multiple CoreDNS server implementations (gRPC, HTTPS, and HTTP/3) lack critical resource-limiting controls. An unauthenticated remote attacker can exhaust memory and degrade or crash the server by opening many concurrent connections, streams, or sending oversized request bodies. The issue is similar in nature to CVE-2025-47950 (QUIC DoS) but affects additional server types that do not enforce connection limits, stream limits, or message size constraints.

Impact

1. Missing connection and stream limits (gRPC / HTTPS / HTTP3)

The affected servers do not enforce reasonable upper bounds on concurrent connections or active streams. An attacker can:

Open many parallel connections
Rapidly issue requests without limit
Consume memory until the CoreDNS process becomes unresponsive or is terminated by the OOM killer

Testing demonstrates that modest resource configurations (e.g., 256 MB RAM) can be exhausted quickly. Increasing concurrency parameters in the PoCs allows attackers to scale the impact.

2. Missing message-size validation in the gRPC server

The gRPC server accepts arbitrarily large protobuf messages (default limit ~4 MB per request) without validating against DNS protocol constraints (maximum 64 KB). Sending multiple concurrent oversized messages can quickly exhaust available memory.

This vulnerability mirrors earlier hardening work in PR https://github.com/coredns/coredns/pull/7490, which applied checks for upstream proxying but left server-side request validation unprotected.

Result:

In all cases, remote unauthenticated attackers can reliably trigger memory exhaustion and cause a denial of service.

Patches

v1.14.0

Severity ?

6.6 (Medium)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/coredns/coredns"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.14.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-68151"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-01-08T20:12:58Z",
    "nvd_published_at": "2026-01-08T16:15:59Z",
    "severity": "MODERATE"
  },
  "details": "Multiple CoreDNS server implementations (gRPC, HTTPS, and HTTP/3) lack critical resource-limiting controls. An unauthenticated remote attacker can exhaust memory and degrade or crash the server by opening many concurrent connections, streams, or sending oversized request bodies. The issue is similar in nature to CVE-2025-47950 (QUIC DoS) but affects additional server types that do not enforce connection limits, stream limits, or message size constraints.\n\n### Impact\n\n#### 1. Missing connection and stream limits (gRPC / HTTPS / HTTP3)\n\nThe affected servers do not enforce reasonable upper bounds on concurrent connections or active streams. An attacker can:\n\n- Open many parallel connections\n- Rapidly issue requests without limit\n- Consume memory until the CoreDNS process becomes unresponsive or is terminated by the OOM killer\n\nTesting demonstrates that modest resource configurations (e.g., 256 MB RAM) can be exhausted quickly. Increasing concurrency parameters in the PoCs allows attackers to scale the impact.\n\n#### 2. Missing message-size validation in the gRPC server\n\nThe gRPC server accepts arbitrarily large protobuf messages (default limit ~4 MB per request) without validating against DNS protocol constraints (maximum 64 KB). Sending multiple concurrent oversized messages can quickly exhaust available memory.\n\nThis vulnerability mirrors earlier hardening work in PR https://github.com/coredns/coredns/pull/7490, which applied checks for upstream proxying but left server-side request validation unprotected.\n\n#### Result:\nIn all cases, remote unauthenticated attackers can reliably trigger memory exhaustion and cause a denial of service.\n\n\n### Patches\n_v1.14.0_",
  "id": "GHSA-527x-5wrf-22m2",
  "modified": "2026-01-08T20:12:58Z",
  "published": "2026-01-08T20:12:58Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/coredns/coredns/security/advisories/GHSA-527x-5wrf-22m2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68151"
    },
    {
      "type": "WEB",
      "url": "https://github.com/coredns/coredns/pull/7490"
    },
    {
      "type": "WEB",
      "url": "https://github.com/coredns/coredns/commit/0d8cbb1a6bcb6bc9c1a489865278b8725fa20812"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/coredns/coredns"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U",
      "type": "CVSS_V4"
    }
  ],
  "summary": "CoreDNS gRPC/HTTPS/HTTP3 servers lack resource limits, enabling DoS via unbounded connections and oversized messages"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CVE-2025-68151 (GCVE-0-2025-68151)

WID-SEC-W-2026-0047

FKIE_CVE-2025-68151

GHSA-527X-5WRF-22M2

Impact

1. Missing connection and stream limits (gRPC / HTTPS / HTTP3)

2. Missing message-size validation in the gRPC server

Result:

Patches

Tags

Sightings

Nomenclature