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CVE-2020-25697

Status: ModifiedHigh (7)—

A privilege escalation flaw was found in the Xorg-x11-server due to a lack of authentication for X11 clients. This flaw allows an attacker to take control of an X application by impersonating the server it is expecting to connect to.

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 (1)

X.org — X Server

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2020-25697",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
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        "type": "Primary",
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        "cvssData": {
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          "baseScore": 4.4,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:M/Au:N/C:P/I:P/A:P",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "PARTIAL"
        },
        "acInsufInfo": false,
        "impactScore": 6.4,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.4,
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    "cvssMetricV31": [
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          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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  "affected": [
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      "affectedData": [
        {
          "vendor": "n/a",
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  "published": "2021-05-26T13:15:07.600",
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  "vulnStatus": "Modified",
  "weaknesses": [
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      "type": "Secondary",
      "source": "secalert@redhat.com",
      "description": [
        {
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          "value": "CWE-306"
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  "descriptions": [
    {
      "lang": "en",
      "value": "A privilege escalation flaw was found in the Xorg-x11-server due to a lack of authentication for X11 clients. This flaw allows an attacker to take control of an X application by impersonating the server it is expecting to connect to."
    },
    {
      "lang": "es",
      "value": "Se encontró un fallo de escalada de privilegios en el servidor Xorg-x11 debido a una falta de autenticación para los clientes X11. Este fallo permite a un atacante tomar el control de una aplicación X al hacerse pasar por el servidor al que espera conectarse"
    }
  ],
  "lastModified": "2026-06-17T03:07:08.923",
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}