Vulnerability Monitor

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CVE-2020-14396

An issue was discovered in LibVNCServer before 0.9.13. libvncclient/tls_openssl.c has a NULL pointer dereference.

Security Impact Summary

This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 7.5, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and availability (service disruption) for affected systems. Impacting 15 products from libvnc_project, from canonical, from debian and 12 others, organizations running these solutions should prioritize assessment and patching.

Historical Context

Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.

Published

2020-06-17T16:15:11.697

Last Modified

2024-11-21T05:03:10.293

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-476

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	libvnc_project	libvncserver	≤ 0.9.12	Yes
Operating System	canonical	ubuntu_linux	14.04	Yes
Operating System	canonical	ubuntu_linux	16.04	Yes
Operating System	canonical	ubuntu_linux	16.04	Yes
Operating System	canonical	ubuntu_linux	18.04	Yes
Operating System	canonical	ubuntu_linux	18.10	Yes
Operating System	canonical	ubuntu_linux	20.04	Yes
Operating System	debian	debian_linux	8.0	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	siemens	simatic_itc1500_firmware	< 3.2.1.0	Yes
Hardware	siemens	simatic_itc1500	-	No
Operating System	siemens	simatic_itc1500_pro_firmware	< 3.2.1.0	Yes
Hardware	siemens	simatic_itc1500_pro	-	No
Operating System	siemens	simatic_itc1900_firmware	< 3.2.1.0	Yes
Hardware	siemens	simatic_itc1900	-	No
Operating System	siemens	simatic_itc1900_pro_firmware	< 3.2.1.0	Yes
Hardware	siemens	simatic_itc1900_pro	-	No
Operating System	siemens	simatic_itc2200_firmware	< 3.2.1.0	Yes
Hardware	siemens	simatic_itc2200	-	No
Operating System	siemens	simatic_itc2200_pro_firmware	< 3.2.1.0	Yes
Hardware	siemens	simatic_itc2200_pro	-	No

References

https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf Patch, Third Party Advisory ([email protected])
https://github.com/LibVNC/libvncserver/commit/33441d90a506d5f3ae9388f2752901227e430553 Patch, Third Party Advisory ([email protected])
https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13 Release Notes, Third Party Advisory ([email protected])
https://usn.ubuntu.com/4434-1/ Third Party Advisory ([email protected])
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/LibVNC/libvncserver/commit/33441d90a506d5f3ae9388f2752901227e430553 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13 Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://usn.ubuntu.com/4434-1/ Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For libvnc_project's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.