Vulnerability-Lookup

UBUNTU-CVE-2021-32715 (CVE-2021-32715)

Vulnerability from osv_ubuntu – Published: 2021-07-07 20:15 – Updated: 2025-10-24 04:50 – Source website

Details

hyper is an HTTP library for rust. hyper's HTTP/1 server code had a flaw that incorrectly parses and accepts requests with a Content-Length header with a prefixed plus sign, when it should have been rejected as illegal. This combined with an upstream HTTP proxy that doesn't parse such Content-Length headers, but forwards them, can result in "request smuggling" or "desync attacks". The flaw exists in all prior versions of hyper prior to 0.14.10, if built with rustc v1.5.0 or newer. The vulnerability is patched in hyper version 0.14.10. Two workarounds exist: One may reject requests manually that contain a plus sign prefix in the Content-Length header or ensure any upstream proxy handles Content-Length headers with a plus sign prefix.

Severity

3.1 (Low)


                    
                      CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

5.3 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2021-32715	REPORT
	https://github.com/hyperium/hyper/security/adviso…	REPORT
	https://github.com/rust-lang/rust/pull/28826/comm…	REPORT
	https://rustsec.org/advisories/RUSTSEC-2021-0078.html	REPORT
	https://www.cve.org/CVERecord?id=CVE-2021-32715	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "librust-hyper+default-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+futures-cpupool-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+net2-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+runtime-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-executor-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-reactor-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-tcp-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-threadpool-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper+tokio-timer-dev",
            "binary_version": "0.12.35-1"
          },
          {
            "binary_name": "librust-hyper-dev",
            "binary_version": "0.12.35-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "rust-hyper",
        "purl": "pkg:deb/ubuntu/rust-hyper@0.12.35-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.12.35-1"
      ]
    }
  ],
  "aliases": [],
  "details": "hyper is an HTTP library for rust. hyper\u0027s HTTP/1 server code had a flaw that incorrectly parses and accepts requests with a `Content-Length` header with a prefixed plus sign, when it should have been rejected as illegal. This combined with an upstream HTTP proxy that doesn\u0027t parse such `Content-Length` headers, but forwards them, can result in \"request smuggling\" or \"desync attacks\". The flaw exists in all prior versions of hyper prior to 0.14.10, if built with `rustc` v1.5.0 or newer. The vulnerability is patched in hyper version 0.14.10. Two workarounds exist: One may reject requests manually that contain a plus sign prefix in the `Content-Length` header or ensure any upstream proxy handles `Content-Length` headers with a plus sign prefix.",
  "id": "UBUNTU-CVE-2021-32715",
  "modified": "2025-10-24T04:50:20Z",
  "published": "2021-07-07T20:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-32715"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99c"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/rust-lang/rust/pull/28826/commits/123a83326fb95366e94a3be1a74775df4db97739"
    },
    {
      "type": "REPORT",
      "url": "https://rustsec.org/advisories/RUSTSEC-2021-0078.html"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-32715"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-32715"
  ]
}

CVE-2021-32715 (GCVE-0-2021-32715)

Vulnerability from cvelistv5 – Published: 2021-07-07 20:05 – Updated: 2024-08-03 23:25

Title

Lenient Parsing of Content-Length Header When Prefixed with Plus Sign

Summary

hyper is an HTTP library for rust. hyper's HTTP/1 server code had a flaw that incorrectly parses and accepts requests with a `Content-Length` header with a prefixed plus sign, when it should have been rejected as illegal. This combined with an upstream HTTP proxy that doesn't parse such `Content-Length` headers, but forwards them, can result in "request smuggling" or "desync attacks". The flaw exists in all prior versions of hyper prior to 0.14.10, if built with `rustc` v1.5.0 or newer. The vulnerability is patched in hyper version 0.14.10. Two workarounds exist: One may reject requests manually that contain a plus sign prefix in the `Content-Length` header or ensure any upstream proxy handles `Content-Length` headers with a plus sign prefix.

Severity

3.1 (Low)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N

CWE

CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/hyperium/hyper/security/adviso…	x_refsource_CONFIRM
https://github.com/rust-lang/rust/pull/28826/comm…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
hyperium	hyper	Affected: < 0.14.10

Show details on NVD website

JSON

To clipboard

{
  "containers": {
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        "providerMetadata": {
          "dateUpdated": "2024-08-03T23:25:31.081Z",
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    "cna": {
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          "versions": [
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        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 3.1,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
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            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
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            {
              "cweId": "CWE-444",
              "description": "CWE-444: Inconsistent Interpretation of HTTP Requests (\u0027HTTP Request Smuggling\u0027)",
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      "providerMetadata": {
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      "references": [
        {
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          "url": "https://github.com/hyperium/hyper/security/advisories/GHSA-f3pg-qwvg-p99c"
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        {
          "tags": [
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          "url": "https://github.com/rust-lang/rust/pull/28826/commits/123a83326fb95366e94a3be1a74775df4db97739"
        }
      ],
      "source": {
        "advisory": "GHSA-f3pg-qwvg-p99c",
        "discovery": "UNKNOWN"
      },
      "title": "Lenient Parsing of Content-Length Header When Prefixed with Plus Sign",
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "security-advisories@github.com",
          "ID": "CVE-2021-32715",
          "STATE": "PUBLIC",
          "TITLE": "Lenient Parsing of Content-Length Header When Prefixed with Plus Sign"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "hyper",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "\u003c 0.14.10"
                          }
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                      }
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                },
                "vendor_name": "hyperium"
              }
            ]
          }
        },
        "data_format": "MITRE",
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        "data_version": "4.0",
        "description": {
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            }
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}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

UBUNTU-CVE-2021-32715 (CVE-2021-32715)

CVE-2021-32715 (GCVE-0-2021-32715)

Tags

Sightings

Nomenclature

Related by attack behaviour