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CVE-2025-30355

Estado: AnalizadaAlta (7.5)—

Synapse is an open source Matrix homeserver implementation. A malicious server can craft events which, when received, prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild and has been fixed in Synapse v1.127.1. No known workarounds are available.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Servidor Matrix remoto malicioso envía eventos que deniegan federación (DoS): vulnerabilidad en validación de entrada (CWE-20) explotable sin autenticación vía red.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Filter Network TrafficVulnerability ScanningPrivileged Account ManagementNetwork SegmentationLimit Access to Resource Over NetworkApplication Isolation and Sandboxing

Tecnologías afectadas (1)

Matrix — Synapse

CWE

Referencias

JSON original (NVD)

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  "id": "CVE-2025-30355",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
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        "ssvcData": {
          "id": "CVE-2025-30355",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-03-27T13:47:41.011255Z"
        }
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    "cvssMetricV31": [
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          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 4.2,
        "exploitabilityScore": 2.8
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  "published": "2025-03-27T01:15:12.500",
  "references": [
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      "url": "https://github.com/element-hq/synapse/commit/2277df2a1eb685f85040ef98fa21d41aa4cdd389",
      "tags": [
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      "url": "https://github.com/element-hq/synapse/releases/tag/v1.127.1",
      "tags": [
        "Release Notes"
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    },
    {
      "url": "https://github.com/element-hq/synapse/security/advisories/GHSA-v56r-hwv5-mxg6",
      "tags": [
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      "source": "security-advisories@github.com"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
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          "value": "CWE-20"
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    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
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      ]
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Synapse is an open source Matrix homeserver implementation. A malicious server can craft events which, when received, prevent Synapse version up to 1.127.0 from federating with other servers. The vulnerability has been exploited in the wild and has been fixed in Synapse v1.127.1. No known workarounds are available."
    },
    {
      "lang": "es",
      "value": "Synapse es una implementación de código abierto de un servidor doméstico Matrix. Un servidor malicioso puede manipular eventos que, al recibirse, impiden que las versiones de Synapse hasta la 1.127.0 se federen con otros servidores. La vulnerabilidad se ha explotado in situ y se ha corregido en Synapse v1.127.1. No se conocen workarounds."
    }
  ],
  "lastModified": "2026-06-17T09:08:34.360",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*",
              "vulnerable": true,
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              "versionEndExcluding": "1.127.1"
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