CVE-2020-17527 (GCVE-0-2020-17527)

Vulnerability from cvelistv5 – Published: 2020-12-03 18:30 – Updated: 2026-10-08 21:13
VLAI
Title
Apache Tomcat: Request header mix-up between HTTP/2 streams
Summary
While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-08 21:06 UTC
CWE
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 1024 records in the last 180 days details
References
URL Tags
https://lists.apache.org/thread.html/rce5ac9a4017… x_refsource_MISC
https://lists.apache.org/thread.html/r8a227ac6a75… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/raa0e9ad388c… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rce5ac9a4017… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rd5babd13d7a… mailing-listx_refsource_MLIST
http://www.openwall.com/lists/oss-security/2020/12/03/3 mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rabbe6b3ae6a… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ra35c8d617b1… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r9fd47f1b03e… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r26a2a663390… mailing-listx_refsource_MLIST
https://lists.debian.org/debian-lts-announce/2020… mailing-listx_refsource_MLIST
https://security.gentoo.org/glsa/202012-23 vendor-advisoryx_refsource_GENTOO
https://lists.apache.org/thread.html/rca833c6d42b… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ra9fcdb904dd… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/r5a285242737… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/ra9fcdb904dd… mailing-listx_refsource_MLIST
https://lists.apache.org/thread.html/rbba08c4dcef… mailing-listx_refsource_MLIST
https://www.debian.org/security/2021/dsa-4835 vendor-advisoryx_refsource_DEBIAN
https://lists.apache.org/thread.html/r2d6e05c5ff9… mailing-listx_refsource_MLIST
https://www.oracle.com/security-alerts/cpuApr2021.html x_refsource_MISC
https://security.netapp.com/advisory/ntap-2020121… x_refsource_CONFIRM
https://www.oracle.com//security-alerts/cpujul2021.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpujan2022.html x_refsource_MISC
https://www.oracle.com/security-alerts/cpuapr2022.html x_refsource_MISC
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache Tomcat Affected: Apache Tomcat 10 10.0.0-M1 to 10.0.0-M9
Affected: Apache Tomcat 9 9.0.0-M1 to 9.0.39
Affected: Apache Tomcat 8.5 8.5.0 to 8.5.59
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        "descriptions": [
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            "lang": "en",
            "value": "While investigating bug 64830 it was discovered that Apache Tomcat 10.0.0-M1 to 10.0.0-M9, 9.0.0-M1 to 9.0.39 and 8.5.0 to 8.5.59 could re-use an HTTP request header value from the previous stream received on an HTTP/2 connection for the request associated with the subsequent stream. While this would most likely lead to an error and the closure of the HTTP/2 connection, it is possible that information could leak between requests."
          },
          {
            "lang": "es",
            "value": "Al investigar el error 64830, se detect\u00f3 que Apache Tomcat versiones 10.0.0-M1 hasta 10.0.0-M9, versiones 9.0.0-M1 hasta 9.0.39 y versiones 8.5.0 hasta 8.5.59, podr\u00eda reutilizar un valor de encabezado de petici\u00f3n HTTP de la transmisi\u00f3n anterior recibida en una conexi\u00f3n HTTP/2 para la petici\u00f3n asociada con la transmisi\u00f3n posterior.\u0026#xa0;Si bien esto probablemente conllevar\u00eda a un error y al cierre de la conexi\u00f3n HTTP/2, es posible que la informaci\u00f3n podr\u00eda filtrarse entre peticiones"
          }
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        "id": "CVE-2020-17527",
        "lastModified": "2026-10-08T22:16:57.557",
        "metrics": {
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              "acInsufInfo": false,
              "baseSeverity": "MEDIUM",
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                "authentication": "NONE",
                "availabilityImpact": "NONE",
                "baseScore": 5.0,
                "confidentialityImpact": "PARTIAL",
                "integrityImpact": "NONE",
                "vectorString": "AV:N/AC:L/Au:N/C:P/I:N/A:N",
                "version": "2.0"
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              "exploitabilityScore": 10.0,
              "impactScore": 2.9,
              "obtainAllPrivilege": false,
              "obtainOtherPrivilege": false,
              "obtainUserPrivilege": false,
              "source": "nvd@nist.gov",
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                "availabilityImpact": "NONE",
                "baseScore": 7.5,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
                "version": "3.1"
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                "options": [
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                    "automatable": "yes"
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                "role": "CISA Coordinator",
                "timestamp": "2026-10-08T21:06:11.841517Z",
                "version": "2.0.3"
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        "published": "2020-12-03T19:15:12.200",
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        ],
        "sourceIdentifier": "security@apache.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-200"
              }
            ],
            "source": "security@apache.org",
            "type": "Secondary"
          },
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-200"
              }
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            "source": "nvd@nist.gov",
            "type": "Primary"
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    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T21:44:55+00:00",
      "cve": "CVE-2020-17527",
      "id": "CVE-2020-17527",
      "initial_release_date": "2020-12-03T00:00:00+00:00",
      "product_status:fixed": "31",
      "product_status:known_affected": "7",
      "product_status:known_not_affected": "38",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "tomcat: HTTP/2 request header mix-up",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-17527.json",
      "version": "3"
    }
  }
}



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Sightings

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