HOMEVULNERABILITIESCVE-2019-15681
HIGH

CVE-2019-15681

CWE-665Published: October 29, 2019· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official Description

LibVNC commit before d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a contains a memory leak (CWE-655) in VNC server code, which allow an attacker to read stack memory and can be abused for information disclosure. Combined with another vulnerability, it can be used to leak stack memory and bypass ASLR. This attack appear to be exploitable via network connectivity. These vulnerabilities have been fixed in commit d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a.

NVD Source

Technical Analysis

CVE-2019-15681 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected Vendors & Products

Canonical1 product(s)
ubuntu linux
Debian1 product(s)
debian linux
libvnc_project1 product(s)
libvncserver
siemens12 product(s)
simatic itc1500 firmwaresimatic itc1500simatic itc1500 pro firmwaresimatic itc1500 prosimatic itc1900 firmwaresimatic itc1900simatic itc1900 pro firmwaresimatic itc1900 prosimatic itc2200 firmwaresimatic itc2200simatic itc2200 pro firmwaresimatic itc2200 pro
Source: NVD CPE · 19 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/LibVNC/libvncserver/commit/d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a
PATCHhttps://github.com/LibVNC/libvncserver/commit/d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.html
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00073.html
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/10/msg00039.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/11/msg00032.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/12/msg00028.html
ADVISORYhttps://usn.ubuntu.com/4407-1/
ADVISORYhttps://usn.ubuntu.com/4547-1/
ADVISORYhttps://usn.ubuntu.com/4573-1/
ADVISORYhttps://usn.ubuntu.com/4587-1/
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.html
ADVISORYhttp://lists.opensuse.org/opensuse-security-announce/2020-07/msg00073.html
ADVISORYhttps://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/10/msg00039.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/11/msg00032.html
ADVISORYhttps://lists.debian.org/debian-lts-announce/2019/12/msg00028.html
ADVISORYhttps://usn.ubuntu.com/4407-1/
ADVISORYhttps://usn.ubuntu.com/4547-1/
ADVISORYhttps://usn.ubuntu.com/4573-1/
ADVISORYhttps://usn.ubuntu.com/4587-1/

All References (24)

→
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.htmlMailing List · Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00073.htmlMailing List · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdfThird Party Advisory
→
https://github.com/LibVNC/libvncserver/commit/d01e1bb4246323ba6fcee3b82ef1faa9b1dac82aPatch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/10/msg00039.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/11/msg00032.htmlMailing List · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2019/12/msg00028.htmlMailing List · Third Party Advisory
→
https://usn.ubuntu.com/4407-1/Third Party Advisory
→
https://usn.ubuntu.com/4547-1/Third Party Advisory
→
https://usn.ubuntu.com/4573-1/Third Party Advisory
→
https://usn.ubuntu.com/4587-1/Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.htmlMailing List · Third Party Advisory
→
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00073.htmlMailing List · Third Party Advisory
→
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdfThird Party Advisory

Quick Facts

CVE IDCVE-2019-15681
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-665
CISA KEVNo
Affected4 vendor(s)
PublishedOct 29, 2019

Related CVEs (CWE-665)

CVE-2023-20591
10.0
CVE-2019-14271
9.8
CVE-2015-8367
9.8
CVE-2017-13715
9.8
CVE-2019-3464
9.8
CVE-2022-21724
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2019-15681 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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