CVE-2021-3672 (GCVE-0-2021-3672)

Vulnerability from cvelistv5 – Published: 2021-11-23 00:00 – Updated: 2024-10-15 17:14
VLAI
Summary
A flaw was found in c-ares library, where a missing input validation check of host names returned by DNS (Domain Name Servers) can lead to output of wrong hostnames which might potentially lead to Domain Hijacking. The highest threat from this vulnerability is to confidentiality and integrity as well as system availability.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
Impacted products
Vendor Product Version
n/a c-ares Affected: c-ares 1.17.2
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T10:57:28+00:00",
      "cve": "CVE-2021-3672",
      "id": "CVE-2021-3672",
      "initial_release_date": "2021-08-10T00:00:00+00:00",
      "product_status:fixed": "215",
      "product_status:known_affected": "5",
      "product_status:known_not_affected": "23",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "c-ares: Missing input validation of host names may lead to domain hijacking",
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  }
}



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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.