FKIE_CVE-2025-59089

Vulnerability from fkie_nvd - Published: 2025-11-12 17:15 - Updated: 2026-06-17 09:45
Severity
5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
If an attacker causes kdcproxy to connect to an attacker-controlled KDC server (e.g. through server-side request forgery), they can exploit the fact that kdcproxy does not enforce bounds on TCP response length to conduct a denial-of-service attack. While receiving the KDC's response, kdcproxy copies the entire buffered stream into a new buffer on each recv() call, even when the transfer is incomplete, causing excessive memory allocation and CPU usage. Additionally, kdcproxy accepts incoming response chunks as long as the received data length is not exactly equal to the length indicated in the response header, even when individual chunks or the total buffer exceed the maximum length of a Kerberos message. This allows an attacker to send unbounded data until the connection timeout is reached (approximately 12 seconds), exhausting server memory or CPU resources. Multiple concurrent requests can cause accept queue overflow, denying service to legitimate clients.
References
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21138
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21139
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21140
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21141
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21142
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21448
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21748
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21806
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21818
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21819
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21820
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:21821
secalert@redhat.comhttps://access.redhat.com/errata/RHSA-2025:22982
secalert@redhat.comhttps://access.redhat.com/security/cve/CVE-2025-59089
secalert@redhat.comhttps://bugzilla.redhat.com/show_bug.cgi?id=2393958
secalert@redhat.comhttps://github.com/latchset/kdcproxy/commit/c7675365aa20be11f03247966336c7613cac84e1
secalert@redhat.comhttps://github.com/latchset/kdcproxy/pull/68
af854a3a-2127-422b-91ae-364da2661108https://github.com/latchset/kdcproxy/commit/c7675365aa20be11f03247966336c7613cac84e1
Impacted products
Vendor Product Version
To clipboard 

{
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    {
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          "vendor": "Red Hat",
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              "versionType": "rpm"
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      ],
      "source": "secalert@redhat.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "If an attacker causes kdcproxy to connect to an attacker-controlled KDC server (e.g. through server-side request forgery), they can exploit the fact that kdcproxy does not enforce bounds on TCP response length to conduct a denial-of-service attack. While receiving the KDC\u0027s response, kdcproxy copies the entire buffered stream into a new\nbuffer on each recv() call, even when the transfer is incomplete, causing excessive memory allocation and CPU usage. Additionally, kdcproxy accepts incoming response chunks as long as the received data length is not exactly equal to the length indicated in the response\nheader, even when individual chunks or the total buffer exceed the maximum length of a Kerberos message. This allows an attacker to send unbounded data until the connection timeout is reached (approximately 12 seconds), exhausting server memory or CPU resources. Multiple concurrent requests can cause accept queue overflow, denying service to legitimate clients."
    }
  ],
  "id": "CVE-2025-59089",
  "lastModified": "2026-06-17T09:45:31.770",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "secalert@redhat.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-59089",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-11-12T20:47:44.917442Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-11-12T17:15:38.360",
  "references": [
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21138"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21139"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21140"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21141"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21142"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21448"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21748"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21806"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21818"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21819"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21820"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:21821"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/errata/RHSA-2025:22982"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://access.redhat.com/security/cve/CVE-2025-59089"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2393958"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://github.com/latchset/kdcproxy/commit/c7675365aa20be11f03247966336c7613cac84e1"
    },
    {
      "source": "secalert@redhat.com",
      "url": "https://github.com/latchset/kdcproxy/pull/68"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://github.com/latchset/kdcproxy/commit/c7675365aa20be11f03247966336c7613cac84e1"
    }
  ],
  "sourceIdentifier": "secalert@redhat.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "secalert@redhat.com",
      "type": "Secondary"
    }
  ]
}


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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

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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.
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  • 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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