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CVE-2024-32650

Status: DeferredHigh (7.5)—

Rustls is a modern TLS library written in Rust. `rustls::ConnectionCommon::complete_io` could fall into an infinite loop based on network input. When using a blocking rustls server, if a client send a `close_notify` message immediately after `client_hello`, the server's `complete_io` will get in an infinite loop. This vulnerability is fixed in 0.23.5, 0.22.4, and 0.21.11.

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)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Rustls — RustlsAI

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2024-32650",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-32650",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2024-04-22T15:34:25.994212Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security-advisories@github.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "rustls",
          "product": "rustls",
          "versions": [
            {
              "status": "affected",
              "version": ">= 0.23.0, < 0.23.5"
            },
            {
              "status": "affected",
              "version": ">= 0.22.0, < 0.22.4"
            },
            {
              "status": "affected",
              "version": ">= 0.21.0, < 0.21.11"
            },
            {
              "status": "affected",
              "version": "= 0.20.0"
            }
          ]
        }
      ]
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    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:rustls_project:rustls:*:*:*:*:*:*:*:*"
          ],
          "vendor": "rustls_project",
          "product": "rustls",
          "versions": [
            {
              "status": "unknown",
              "version": "0.21.11"
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          "defaultStatus": "unknown"
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  ],
  "published": "2024-04-19T16:15:10.940",
  "references": [
    {
      "url": "https://github.com/rustls/rustls/commit/2123576840aa31043a31b0770e6572136fbe0c2d",
      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/rustls/rustls/commit/6e938bcfe82a9da7a2e1cbf10b928c7eca26426e",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/rustls/rustls/commit/f45664fbded03d833dffd806503d3c8becd1b71e",
      "source": "security-advisories@github.com"
    },
    {
      "url": "https://github.com/rustls/rustls/security/advisories/GHSA-6g7w-8wpp-frhj",
      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/rustls/rustls/commit/2123576840aa31043a31b0770e6572136fbe0c2d",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://github.com/rustls/rustls/commit/6e938bcfe82a9da7a2e1cbf10b928c7eca26426e",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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    {
      "url": "https://github.com/rustls/rustls/commit/f45664fbded03d833dffd806503d3c8becd1b71e",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/rustls/rustls/security/advisories/GHSA-6g7w-8wpp-frhj",
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-835"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "Rustls is a modern TLS library written in Rust. `rustls::ConnectionCommon::complete_io` could fall into an infinite loop based on network input. When using a blocking rustls server, if a client send a `close_notify` message immediately after `client_hello`, the server's `complete_io` will get in an infinite loop. This vulnerability is fixed in 0.23.5, 0.22.4, and 0.21.11."
    },
    {
      "lang": "es",
      "value": "Rustls es una librería TLS moderna escrita en Rust. `rustls::ConnectionCommon::complete_io` podría caer en un bucle infinito basado en la entrada de la red. Cuando se utiliza un servidor Rustls de bloqueo, si un cliente envía un mensaje `close_notify` inmediatamente después de `client_hello`, el `complete_io` del servidor entrará en un bucle infinito. Esta vulnerabilidad se solucionó en 0.23.5, 0.22.4 y 0.21.11."
    }
  ],
  "lastModified": "2026-06-17T07:30:09.197",
  "sourceIdentifier": "security-advisories@github.com"
}