CVE-2021-22876 (GCVE-0-2021-22876)

Vulnerability from cvelistv5 – Published: 2021-04-01 17:45 – Updated: 2025-06-09 14:54
VLAI
Summary
curl 7.1.1 to and including 7.75.0 is vulnerable to an "Exposure of Private Personal Information to an Unauthorized Actor" by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-359 - Privacy Violation (CWE-359)
Assigner
References
Impacted products
Vendor Product Version
n/a https://github.com/curl/curl Affected: 7.1.1 to and including 7.75.0
Show details on NVD website
To clipboard 

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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T12:04:06+00:00",
      "cve": "CVE-2021-22876",
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      "initial_release_date": "2021-03-31T00:00:00+00:00",
      "product_status:fixed": "204",
      "product_status:known_affected": "17",
      "product_status:known_not_affected": "6",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "curl: Leak of authentication credentials in URL via automatic Referer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-22876.json",
      "version": "3"
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    "suse_vex": {
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      "current_release_date": "2026-07-25T17:43:03Z",
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      "initial_release_date": "2023-02-15T03:45:54Z",
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      "product_status:recommended": "437",
      "source": "SUSE CSAF VEX",
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      "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.