CVE-2019-20788: n/a vulnerability

CVE-2019-20788: libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-base...

libvncclient/cursor.c in LibVNCServer through 0.9.12 has a HandleCursorShape integer overflow and heap-based buffer overflow via a large height or width value. NOTE: this may overlap CVE-2019-15690.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 02:53 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2019-20788 is a memory-safety flaw in LibVNCServer's libvncclient cursor handling. A very large cursor width or height can trigger integer overflow and heap buffer overflow. Business risk depends on whether your software or appliances bundle LibVNCServer/libvncclient through 0.9.12. Exposure is most likely in applications, Linux distribution packages, or vendor products that include LibVNCServer/libvncclient through 0.9.12. The source bundle cites Ubuntu, openSUSE, and Siemens advisories, but does not provide complete product inventory details. Treat as a dependency exposure requiring inventory and patch validation, not an emergency unless affected VNC client components connect to untrusted systems. Absence of KEV evidence lowers urgency, but memory-corruption bugs in remote-display code still deserve timely remediation. Mitigation focus: Upgrade LibVNCServer/libvncclient using vendor-supported packages or fixed upstream code.; Review Ubuntu, openSUSE, Siemens, and relevant vendor advisories for applicable updates.; Inventory products and appliances that bundle LibVNCServer or VNC client functionality..

Prepared: Jun 5, 2026, 14:59 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2019-20788 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup

Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Apr 23, 2020, 18:06 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

5Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://github.com/LibVNC/libvncserver/commit/54220248886b5001fbbb9fa73c4e1a2cb9413fedCVE reference · x_refsource_MISC
USN-4407-1CVE reference · vendor-advisory, x_refsource_UBUNTU
https://securitylab.github.com/advisories/GHSL-2020-064-libvnc-libvncclientCVE reference · x_refsource_MISC
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdfCVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.