CVE-2022-43551 (GCVE-0-2022-43551)

Vulnerability from cvelistv5 – Published: 2022-12-23 00:00 – Updated: 2026-02-13 19:43
VLAI
Summary
A vulnerability exists in curl <7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. However, the HSTS mechanism could be bypassed if the host name in the given URL first uses IDN characters that get replaced to ASCII counterparts as part of the IDN conversion. Like using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop (U+002E) `.`. Then in a subsequent request, it does not detect the HSTS state and makes a clear text transfer. Because it would store the info IDN encoded but look for it IDN decoded.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-08-15 14:38 UTC
CWE
  • CWE-319 - Cleartext Transmission of Sensitive Information (CWE-319)
Assigner
hackerone CNA under the mitre root
CNA scorecard D 59/100 over 187 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
n/a https://github.com/curl/curl Affected: Fixed in curl 7.87.0
Show details on NVD website
To clipboard 

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          {
            "source": "support@hackerone.com",
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        "vulnStatus": "Modified",
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    },
    "redhat_vex": {
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      "current_release_date": "2026-09-21T05:43:43+00:00",
      "cve": "CVE-2022-43551",
      "id": "CVE-2022-43551",
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      "product_status:fixed": "11",
      "product_status:known_affected": "8",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "curl: HSTS bypass via IDN",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-43551.json",
      "version": "3"
    },
    "suse_vex": {
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      "cve": "CVE-2022-43551",
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      "product_status:recommended": "245",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-43551",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-43551.json",
      "version": "53"
    },
    "vulnrichment": {
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        "adp": [
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            "providerMetadata": {
              "dateUpdated": "2024-08-03T13:32:59.718Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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              {
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                "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TVWZW5CNSJ7UYAF2BGSYAWAEXDJYUBHA/"
              },
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            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "NETWORK",
                  "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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              },
              {
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              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
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              "vendor": "n/a",
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          "descriptions": [
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              "lang": "en",
              "value": "A vulnerability exists in curl \u003c7.87.0 HSTS check that could be bypassed to trick it to keep using HTTP. Using its HSTS support, curl can be instructed to use HTTPS instead of using an insecure clear-text HTTP step even when HTTP is provided in the URL. However, the HSTS mechanism could be bypassed if the host name in the given URL first uses IDN characters that get replaced to ASCII counterparts as part of the IDN conversion. Like using the character UTF-8 U+3002 (IDEOGRAPHIC FULL STOP) instead of the common ASCII full stop (U+002E) `.`. Then in a subsequent request, it does not detect the HSTS state and makes a clear text transfer. Because it would store the info IDN encoded but look for it IDN decoded."
            }
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                {
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                  "description": "Cleartext Transmission of Sensitive Information (CWE-319)",
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            },
            {
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            },
            {
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        "assignerShortName": "hackerone",
        "cveId": "CVE-2022-43551",
        "datePublished": "2022-12-23T00:00:00.000Z",
        "dateReserved": "2022-10-20T00:00:00.000Z",
        "dateUpdated": "2026-02-13T19:43:56.236Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.



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.