Security readout for executives and security teams
LibVNCServer before 0.9.13 contains a client-side information leak. Under the affected repeater connection path, uninitialized memory contents may be exposed. The public bundle does not provide a CVSS score, affected product matrix, or evidence of active exploitation. Exposure is most likely where applications, appliances, or Linux packages include LibVNCServer/libvncclient before 0.9.13. Confirm downstream package versions because vendors may backport fixes without changing upstream version numbers. Treat as a targeted remediation item, not an emergency based on the supplied evidence. Prioritize systems that use VNC client or repeater functionality, especially managed endpoints, remote support tooling, and embedded products. Mitigation focus: Upgrade LibVNCServer/libvncclient to 0.9.13 or later where possible.; Apply fixed Fedora, openSUSE, Siemens, or other vendor-provided packages when applicable.; Check vendor guidance for embedded products or bundled LibVNCClient copies..
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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-2018-21247 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
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/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13CVE reference · x_refsource_MISC
- https://github.com/LibVNC/libvncserver/issues/253CVE reference · x_refsource_MISC
- FEDORA-2020-37112ac660CVE reference · vendor-advisory, x_refsource_FEDORA
- FEDORA-2020-1a4b1c8271CVE reference · vendor-advisory, x_refsource_FEDORA
- https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdfCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.