CVE-2019-15681

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.

Published: 2019-10-29 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-15681 is rated High Risk (65.7/100): CVSS High severity, with high exploitation likelihood (EPSS 9.37%, 93th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +3.18% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-15681

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-28 6.19% 9.37% +3.18%
2 2025-12-28 3.34% 6.19% +2.85%
3 2025-12-27 — 3.34% —

Full EPSS history (25 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-15681

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2019-15681

OS Trackers for CVE-2019-15681

vendor priority summary link
alpine high CVE-2019-15681: 1 source package rows (libvncserver); 9 state rows across 9 repos (3.10-main, 3.11-main, 3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 9, open 0. https://security.alpinelinux.org/vuln/CVE-2019-15681
debian low CVE-2019-15681 low priority: Debian including 3 source packages (libvncserver, tightvnc, vino), 12 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 12. https://security-tracker.debian.org/tracker/CVE-2019-15681
redhat low — https://access.redhat.com/security/cve/CVE-2019-15681
suse medium CVE-2019-15681 severity moderate: SUSE including 37 source package names (LibVNCServer-0.9.1-160.14.1, LibVNCServer-devel-0.9.10-4.14.1, …), 118 product×package rows across 57 product lines (HPE Helion OpenStack 8, SUSE Enterprise Storage 5, … (57 product lines)): Fixed 116, Known Not Affected 2. https://www.suse.com/security/cve/CVE-2019-15681/
ubuntu low CVE-2019-15681 low priority: Ubuntu including 7 source packages (italc, krfb, …), 124 status rows across 18 suites (bionic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 41, needs-triage 22, not-affected 21, released 21, DNE 19. https://ubuntu.com/security/CVE-2019-15681

Affected software / configurations for CVE-2019-15681

Vendor Product Version Raw CPE
libvnc_project libvncserver < 0.9.12 cpe:2.3:a:libvnc_project:libvncserver:*:*:*:*:*:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 18.10 cpe:2.3:o:canonical:ubuntu_linux:18.10:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
siemens simatic_itc1500_firmware >= 3.0.0.0, < 3.2.1.0 cpe:2.3:o:siemens:simatic_itc1500_firmware:*:*:*:*:*:*:*:*
siemens simatic_itc1500_pro_firmware >= 3.0.0.0, < 3.2.1.0 cpe:2.3:o:siemens:simatic_itc1500_pro_firmware:*:*:*:*:*:*:*:*
siemens simatic_itc1900_firmware >= 3.0.0.0, < 3.2.1.0 cpe:2.3:o:siemens:simatic_itc1900_firmware:*:*:*:*:*:*:*:*
siemens simatic_itc1900_pro_firmware >= 3.0.0.0, < 3.2.1.0 cpe:2.3:o:siemens:simatic_itc1900_pro_firmware:*:*:*:*:*:*:*:*
siemens simatic_itc2200_firmware >= 3.0.0.0, < 3.2.1.0 cpe:2.3:o:siemens:simatic_itc2200_firmware:*:*:*:*:*:*:*:*
siemens simatic_itc2200_pro_firmware >= 3.0.0.0, < 3.2.1.0 cpe:2.3:o:siemens:simatic_itc2200_pro_firmware:*:*:*:*:*:*:*:*

References for CVE-2019-15681

URL Tags
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00027.html Mailing List Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00073.html Mailing List Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-390195.pdf Third Party Advisory
https://github.com/LibVNC/libvncserver/commit/d01e1bb4246323ba6fcee3b82ef1faa9b1dac82a Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00039.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/11/msg00032.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html Mailing 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
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