Security readout for executives and security teams
Plain-English summary
TigerVNC viewer versions before 1.3.1 could crash, and may allow code execution, when rendering screen data from a malicious or compromised VNC server. The risk is mainly to users who connect old TigerVNC clients to servers they do not fully trust.
Executive priority
Treat this as a cleanup priority for legacy remote-access tooling. It is not reported as actively exploited, but old VNC clients can turn a server-side compromise into endpoint risk.
Technical view
The issue is multiple heap-based buffer overflows in ZRLE_DECODE in common/rfb/zrleDecode.h. It affects TigerVNC before 1.3.1 when NDEBUG is enabled. The trigger is server-supplied VNC screen image rendering data, impacting the vncviewer client.
Likely exposure
Exposure is likely limited to environments still using TigerVNC viewer before 1.3.1, especially where users connect to external, unmanaged, or compromised VNC servers.
Exploitation context
The bundle does not cite active exploitation, and KEV is false. The described attack path requires a remote VNC server to deliver malicious rendering data to an affected viewer.
Researcher notes
Evidence is sparse: no CVSS, CWE list, or detailed patch notes are included in the bundle. The strongest facts are the affected version boundary, NDEBUG condition, ZRLE decode location, and malicious-server-to-viewer attack direction.
Mitigation direction
- Upgrade TigerVNC to version 1.3.1 or later.
- Check TigerVNC and distribution vendor guidance for any backported fixes.
- Limit VNC viewer connections to trusted and managed servers.
- Retire unsupported TigerVNC clients where upgrade status cannot be verified.
Validation and detection
- Inventory TigerVNC viewer versions on workstations and admin jump hosts.
- Confirm no TigerVNC versions before 1.3.1 remain in use.
- Review VNC connection policies for access to untrusted external servers.
- Check package vendor advisories for backported fixed builds.
Public sources used
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2014-0011 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://bugzilla.redhat.com/show_bug.cgi?id=1050928CVE reference · x_refsource_MISC
- https://github.com/TigerVNC/tigervnc/releases/tag/v1.3.1CVE 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.