CVE-2018-7225

Exp

An issue was discovered in LibVNCServer through 0.9.11. rfbProcessClientNormalMessage() in rfbserver.c does not sanitize msg.cct.length, leading to access to uninitialized and potentially sensitive data or possibly unspecified other impact (e.g., an integer overflow) via specially crafted VNC packets.

Published: 2018-02-19 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-7225 is rated High Exploit Risk (83.7/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 3.26%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2018-7225

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2018-7225

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 2026-04-13 4.26% 3.26% -1.01%
2 2025-12-20 4.08% 4.26% +0.18%
3 2025-12-18 — 4.08% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-7225

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
9.8 3.0 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H 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:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 5.9 [email protected]
7.5 2.0 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P 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:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 6.4 [email protected]

Weakness enumeration for CVE-2018-7225

OS Trackers for CVE-2018-7225

vendor priority summary link
alpine critical CVE-2018-7225: 1 source package rows (libvncserver); 11 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 2. https://security.alpinelinux.org/vuln/CVE-2018-7225
debian not yet assigned CVE-2018-7225 not yet assigned 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-2018-7225
gentoo normal CVE-2018-7225: 1 GLSA(s) (201908-05), 1 atom(s) (net-libs/libvncserver); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-7225
redhat medium — https://access.redhat.com/security/cve/CVE-2018-7225
suse high CVE-2018-7225 severity important: SUSE including 32 source package names (LibVNCServer, LibVNCServer-0.9.1-160.3.1, …), 63 product×package rows across 35 product lines (SUSE Liberty Linux 7, SUSE Linux Enterprise Desktop 12 SP3, … (35 product lines)): Fixed 47, Known Not Affected 16. https://www.suse.com/security/cve/CVE-2018-7225/
ubuntu medium CVE-2018-7225 medium priority: Ubuntu including 4 source packages (italc, libvncserver, tightvnc, vino), 65 status rows across 17 suites (artful, bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): released 35, DNE 14, ignored 8, needs-triage 8. https://ubuntu.com/security/CVE-2018-7225

Affected software / configurations for CVE-2018-7225

Vendor Product Version Raw CPE
libvncserver_project libvncserver <= 0.9.11 cpe:2.3:a:libvncserver_project:libvncserver:*:*:*:*:*:*:*:*
debian debian_linux 7.0 cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
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:*:*:*:*:*:*:*
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:*:*:*:lts:*:*:*
canonical ubuntu_linux 17.10 cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
redhat enterprise_linux_desktop 7.0 cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server 7.0 cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
redhat enterprise_linux_server_aus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.5 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.5:*:*:*:*:*:*:*
redhat enterprise_linux_server_eus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_eus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_server_tus 7.6 cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:*
redhat enterprise_linux_workstation 7.0 cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*

References for CVE-2018-7225

URL Tags
http://www.openwall.com/lists/oss-security/2018/02/18/1 Exploit Mailing List Third Party Advisory
http://www.securityfocus.com/bid/103107 Third Party Advisory VDB Entry
https://access.redhat.com/errata/RHSA-2018:1055 Third Party Advisory
https://github.com/LibVNC/libvncserver/issues/218 Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/03/msg00035.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00042.html
https://lists.debian.org/debian-lts-announce/2019/11/msg00032.html
https://lists.debian.org/debian-lts-announce/2019/12/msg00028.html
https://security.gentoo.org/glsa/201908-05
https://usn.ubuntu.com/3618-1/ Third Party Advisory
https://usn.ubuntu.com/4547-1/
https://usn.ubuntu.com/4573-1/
https://usn.ubuntu.com/4587-1/
https://www.debian.org/security/2018/dsa-4221 Third Party Advisory
cvelogic Threat Intelligence