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CVE-2021-28153

Status: ModifiedMedium (5.3)—

An issue was discovered in GNOME GLib before 2.66.8. When g_file_replace() is used with G_FILE_CREATE_REPLACE_DESTINATION to replace a path that is a dangling symlink, it incorrectly also creates the target of the symlink as an empty file, which could conceivably have security relevance if the symlink is attacker-controlled. (If the path is a symlink to a file that already exists, then the contents of that file correctly remain unchanged.)

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (4)

Broadcom — Brocade Fabric Operating System FirmwareDebian — Debian LinuxFedoraproject — FedoraGnome — Glib

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2021-28153",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 5,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "LOW",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
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          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 1.4,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
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      "affectedData": [
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          "vendor": "n/a",
          "product": "n/a",
          "versions": [
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              "status": "affected",
              "version": "n/a"
            }
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  "published": "2021-03-11T22:15:12.777",
  "references": [
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      "url": "https://gitlab.gnome.org/GNOME/glib/-/issues/2325",
      "tags": [
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        "Issue Tracking",
        "Patch",
        "Vendor Advisory"
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      "source": "cve@mitre.org"
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-59"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in GNOME GLib before 2.66.8. When g_file_replace() is used with G_FILE_CREATE_REPLACE_DESTINATION to replace a path that is a dangling symlink, it incorrectly also creates the target of the symlink as an empty file, which could conceivably have security relevance if the symlink is attacker-controlled. (If the path is a symlink to a file that already exists, then the contents of that file correctly remain unchanged.)"
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en GNOME GLib versiones anteriores a 2.66.8. Cuando es usada la función g_file_replace() con G_FILE_CREATE_REPLACE_DESTINATION para reemplazar una ruta que es un enlace simbólico colgante, también crea incorrectamente el destino del enlace simbólico como un archivo vacío, lo que posiblemente podría tener relevancia de seguridad si el enlace simbólico está controlado por un atacante. (Si la ruta es un enlace simbólico para un archivo que ya existe, entonces el contenido de ese archivo permanece sin cambios correctamente)"
    }
  ],
  "lastModified": "2026-06-17T03:45:53.453",
  "configurations": [
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        {
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}