cve-2021-32780
Vulnerability from cvelistv5
Published
2021-08-24 20:55
Modified
2024-08-03 23:33
Summary
Incorrect handling of H/2 GOAWAY followed by SETTINGS frames
Impacted products
envoyproxyenvoy
Show details on NVD website


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          "dateUpdated": "2024-08-03T23:33:56.068Z",
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            "url": "https://www.envoyproxy.io/docs/envoy/v1.19.0/version_history/version_history"
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            "url": "https://github.com/envoyproxy/envoy/security/advisories/GHSA-j374-mjrw-vvp8"
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        ],
        "title": "CVE Program Container"
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          "vendor": "envoyproxy",
          "versions": [
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              "version": "\u003e= 1.18.0, \u003c 1.18.4"
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          "lang": "en",
          "value": "Envoy is an open source L7 proxy and communication bus designed for large modern service oriented architectures. In affected versions Envoy transitions a H/2 connection to the CLOSED state when it receives a GOAWAY frame without any streams outstanding. The connection state is transitioned to DRAINING when it receives a SETTING frame with the SETTINGS_MAX_CONCURRENT_STREAMS parameter set to 0. Receiving these two frames in the same I/O event results in abnormal termination of the Envoy process due to invalid state transition from CLOSED to DRAINING. A sequence of H/2 frames delivered by an untrusted upstream server will result in Denial of Service in the presence of untrusted **upstream** servers. Envoy versions 1.19.1, 1.18.4 contain fixes to stop processing of pending H/2 frames after connection transition to the CLOSED state."
        }
      ],
      "metrics": [
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            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.6,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
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}


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