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CVE-2020-11076 (GCVE-0-2020-11076)

Vulnerability from cvelistv5 – Published: 2020-05-22 14:50 – Updated: 2024-08-04 11:21
VLAI
Title
HTTP Smuggling via Transfer-Encoding Header in Puma
Summary
In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
Assigner
References
Impacted products
Vendor Product Version CPE status
puma puma Affected: < 3.12.5
Affected: >= 4.0.0, < 4.3.4
guessed Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T16:07:13+00:00",
      "cve": "CVE-2020-11076",
      "id": "CVE-2020-11076",
      "initial_release_date": "2020-05-21T00:00:00+00:00",
      "product_status:known_affected": "6",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "rubygem-puma: HTTP Smuggling via an invalid Transfer-Encoding Header",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-11076.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T02:25:46Z",
      "cve": "CVE-2020-11076",
      "id": "CVE-2020-11076",
      "initial_release_date": "2023-02-15T03:59:57Z",
      "product_status:known_affected": "394",
      "product_status:recommended": "424",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2020-11076",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2020-11076.json",
      "version": "36"
    }
  }
}



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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.