CVE-2018-20023 (GCVE-0-2018-20023)
Vulnerability from cvelistv5 – Published: 2018-12-19 16:00 – Updated: 2024-08-05 11:51
VLAI
EPSS
VEX
Summary
LibVNC before 8b06f835e259652b0ff026898014fc7297ade858 contains CWE-665: Improper Initialization vulnerability in VNC Repeater client code that allows attacker to read stack memory and can be abuse for information disclosure. Combined with another vulnerability, it can be used to leak stack memory layout and in bypassing ASLR
Severity
7.5 (High)
CWE
- Information disclosure
Assigner
References
8 references
| URL | Tags |
|---|---|
| https://ics-cert.kaspersky.com/advisories/klcert-… | x_refsource_MISC |
| https://www.debian.org/security/2019/dsa-4383 | vendor-advisoryx_refsource_DEBIAN |
| https://lists.debian.org/debian-lts-announce/2018… | mailing-listx_refsource_MLIST |
| https://usn.ubuntu.com/3877-1/ | vendor-advisoryx_refsource_UBUNTU |
| https://security.gentoo.org/glsa/201908-05 | vendor-advisoryx_refsource_GENTOO |
| https://lists.debian.org/debian-lts-announce/2019… | mailing-listx_refsource_MLIST |
| https://usn.ubuntu.com/4547-1/ | vendor-advisoryx_refsource_UBUNTU |
| https://usn.ubuntu.com/4587-1/ | vendor-advisoryx_refsource_UBUNTU |
Impacted products
Date Public
2018-12-19 00:00
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"redhat_vex": {
"aggregate_severity": "Low",
"current_release_date": "2025-11-21T16:46:11+00:00",
"cve": "CVE-2018-20023",
"id": "CVE-2018-20023",
"initial_release_date": "2018-12-19T00:00:00+00:00",
"product_status:known_affected": "3",
"product_status:known_not_affected": "6",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "libvncserver: Improper initialization in VNC Repeater client code allows for information disclosure",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2018/cve-2018-20023.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-01-01T01:03:18Z",
"cve": "CVE-2018-20023",
"id": "CVE-2018-20023",
"initial_release_date": "2023-02-15T04:21:30Z",
"product_status:known_affected": "30",
"product_status:known_not_affected": "13",
"product_status:recommended": "111",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2018-20023",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2018-20023.json",
"version": "19"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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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.
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