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CVE-2018-21247 (GCVE-0-2018-21247)

Vulnerability from cvelistv5 – Published: 2020-06-17 15:10 – Updated: 2024-08-05 12:26
VLAI
Summary
An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • n/a
Assigner
References
Show details on NVD website
To clipboard 

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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T16:17:44+00:00",
      "cve": "CVE-2018-21247",
      "id": "CVE-2018-21247",
      "initial_release_date": "2018-01-01T00:00:00+00:00",
      "product_status:fixed": "42",
      "product_status:known_affected": "3",
      "product_status:known_not_affected": "3",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "libvncserver: uninitialized memory contents are vulnerable to Information Leak",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-21247.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-04T00:56:21Z",
      "cve": "CVE-2018-21247",
      "id": "CVE-2018-21247",
      "initial_release_date": "2023-02-15T04:20:39Z",
      "product_status:known_affected": "24",
      "product_status:known_not_affected": "3",
      "product_status:recommended": "119",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2018-21247",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2018-21247.json",
      "version": "17"
    }
  }
}



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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.