CVE-2023-45648 (GCVE-0-2023-45648)

Vulnerability from cvelistv5 – Published: 2023-10-10 18:38 – Updated: 2025-10-29 12:00
VLAI
Title
Apache Tomcat: Trailer header parsing too lenient
Summary
Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93 did not correctly parse HTTP trailer headers. A specially crafted, invalid trailer header could cause Tomcat to treat a single request as multiple requests leading to the possibility of request smuggling when behind a reverse proxy. Older, EOL versions may also be affected. Users are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.
Severity
No CVSS data available.
CWE
  • CWE-20 - Improper Input Validation
Assigner
References
Impacted products
Vendor Product Version
Apache Software Foundation Apache Tomcat Affected: 11.0.0-M1 , ≤ 11.0.0-M11 (semver)
Affected: 10.1.0-M1 , ≤ 10.1.13 (semver)
Affected: 9.0.0-M1 , ≤ 9.0.81 (semver)
Affected: 8.5.0 , ≤ 8.5.93 (semver)
Unknown: 3 , < 8.5.0 (semver)
Unknown: 10.0.0-M1 , ≤ 10.0.27 (semver)
Create a notification for this product.
Credits
Keran Mu and Jianjun Chen from Tsinghua University and Zhongguancun Laboratory
Show details on NVD website
To clipboard 

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A specially \\ncrafted, invalid trailer header could cause Tomcat to treat a single \\nrequest as multiple requests leading to the possibility of request \\nsmuggling when behind a reverse proxy.\\n\\nOlder, EOL versions may also be affected.\\n\\n\\nUsers are recommended to upgrade to version 11.0.0-M12 onwards, 10.1.14 onwards, 9.0.81 onwards or 8.5.94 onwards, which fix the issue.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Improper Input Validation vulnerability in Apache Tomcat.\u003cp\u003eTomcat\u0026nbsp;\u003cspan style=\\\"background-color: rgb(255, 255, 255);\\\"\u003efrom 11.0.0-M1 through 11.0.0-M11, from 10.1.0-M1 through 10.1.13, from 9.0.0-M1 through 9.0.81 and from 8.5.0 through 8.5.93\u003c/span\u003e did not correctly parse HTTP trailer headers. 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      "cveMetadata": "{\"cveId\": \"CVE-2023-45648\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-10-29T12:00:47.484Z\", \"dateReserved\": \"2023-10-10T11:31:15.664Z\", \"assignerOrgId\": \"f0158376-9dc2-43b6-827c-5f631a4d8d09\", \"datePublished\": \"2023-10-10T18:38:34.097Z\", \"assignerShortName\": \"apache\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.