CVE-2021-25122 (GCVE-0-2021-25122)

Vulnerability from cvelistv5 – Published: 2021-03-01 12:00 – Updated: 2026-10-08 21:13
VLAI
Title
Apache Tomcat h2c request mix-up
Summary
When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A's request.
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 21:04 UTC
CWE
Assigner
apache CNA under the mitre root
CNA scorecard B 76/100 over 1024 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Apache Software Foundation Apache Tomcat Affected: Apache Tomcat 10 , < 10.0.2 (custom)
Affected: Apache Tomcat 9 , < 9.0.42 (custom)
Affected: Apache Tomcat 8.5 , < 8.5.62 (custom)
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            "lang": "en",
            "value": "When responding to new h2c connection requests, Apache Tomcat versions 10.0.0-M1 to 10.0.0, 9.0.0.M1 to 9.0.41 and 8.5.0 to 8.5.61 could duplicate request headers and a limited amount of request body from one request to another meaning user A and user B could both see the results of user A\u0027s request."
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            "lang": "es",
            "value": "Cuando se responde a nuevas peticiones de conexi\u00f3n h2c, Apache Tomcat versiones 10.0.0-M1 hasta 10.0.0, versiones 9.0.0.M1 hasta 9.0.41 y versiones 8.5.0 hasta 8.5.61, podr\u00edan duplicar los encabezados de petici\u00f3n y una cantidad limitada del cuerpo de petici\u00f3n de una petici\u00f3n a otra, lo que significa que el usuario A y el usuario B podr\u00edan visualizar los resultados de la petici\u00f3n del usuario A"
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        "id": "CVE-2021-25122",
        "lastModified": "2026-10-08T22:17:08.263",
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        ],
        "sourceIdentifier": "security@apache.org",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-200"
              }
            ],
            "source": "security@apache.org",
            "type": "Secondary"
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          {
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                "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": "2026-10-01T16:51:40+00:00",
      "cve": "CVE-2021-25122",
      "id": "CVE-2021-25122",
      "initial_release_date": "2021-03-01T00:00:00+00:00",
      "product_status:fixed": "49",
      "product_status:known_affected": "10",
      "product_status:known_not_affected": "25",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "tomcat: Request mix-up with h2c",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-25122.json",
      "version": "3"
    }
  }
}



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