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TI-2018-15209 Aliases CVE-2018-21247GHSA-355f-mpqr-3mwv

An issue was discovered in LibVNCServer before 0.9.13.

Priority LOW 38CWE-909Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
High · None · None
Fix status
Partial Red Hat: 2 fixed, 1 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

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.

Why it matters now

EPSS 0.02516 84th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 2 fixed, 1 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 21

CPEVersionsRoleVendor
cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:*up to 0.9.12VulnerableLibvnc Project
cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*14.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*16.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*18.04VulnerableCanonical
cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*18.10VulnerableCanonical
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:siemens:simatic_itc1500_firmware:*:*:*:*:*:*:*:*3.0.0.0 to before 3.2.1.0VulnerableSiemens
cpe:2.3:h:siemens:simatic_itc1500:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
  • cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:* Versions up to 0.9.12 Vulnerable ·Libvnc Project
  • cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:* Versions 14.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:* Versions 16.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
  • cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:* Versions 18.10 Vulnerable ·Canonical
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:siemens:simatic_itc1500_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_itc1500:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
Show 11 more CPE
CPEVersionsRoleVendor
cpe:2.3:o:siemens:simatic_itc1500_pro_firmware:*:*:*:*:*:*:*:*3.0.0.0 to before 3.2.1.0VulnerableSiemens
cpe:2.3:h:siemens:simatic_itc1500_pro:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:o:siemens:simatic_itc1900_firmware:*:*:*:*:*:*:*:*3.0.0.0 to before 3.2.1.0VulnerableSiemens
cpe:2.3:h:siemens:simatic_itc1900:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:o:siemens:simatic_itc1900_pro_firmware:*:*:*:*:*:*:*:*3.0.0.0 to before 3.2.1.0VulnerableSiemens
cpe:2.3:h:siemens:simatic_itc1900_pro:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:o:siemens:simatic_itc2200_firmware:*:*:*:*:*:*:*:*3.0.0.0 to before 3.2.1.0VulnerableSiemens
cpe:2.3:h:siemens:simatic_itc2200:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:o:siemens:simatic_itc2200_pro_firmware:*:*:*:*:*:*:*:*3.0.0.0 to before 3.2.1.0VulnerableSiemens
cpe:2.3:h:siemens:simatic_itc2200_pro:-:*:*:*:*:*:*:*not specified by NVDRunning onSiemens
cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:*15.2VulnerableopenSUSE
  • cpe:2.3:o:siemens:simatic_itc1500_pro_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_itc1500_pro:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:o:siemens:simatic_itc1900_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_itc1900:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:o:siemens:simatic_itc1900_pro_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_itc1900_pro:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:o:siemens:simatic_itc2200_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_itc2200:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:o:siemens:simatic_itc2200_pro_firmware:*:*:*:*:*:*:*:* Versions 3.0.0.0 to before 3.2.1.0 Vulnerable ·Siemens
  • cpe:2.3:h:siemens:simatic_itc2200_pro:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Siemens
  • cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* Versions 15.2 Vulnerable ·openSUSE

Remediation

Red Hat 1 advisory

  • RHSA-2021:1811 Released 2021-05-18 · Red Hat rating Moderate
    libvncserver security update
    • Red Hat CodeReady Linux Builder (v. 8) libvncserver-devel-0.9.11-17.el8
    • Red Hat Enterprise Linux AppStream (v. 8) libvncserver-0.9.11-17.el8

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 7AffectedNo fix planned: Will not fix
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2021:1811
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2021:1811
Not affected: 1 product
  • Red Hat Enterprise Linux 6

Timeline

  1. 2026-10-02 Threatist record created from CVE-2018-21247
  2. 2026-10-03 Alias added: GHSA-355f-mpqr-3mwv

References

Patch 2

Advisory 6

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences