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Vulnerability record · CVE-2018-7225 · published 19 February 2018

CVE-2018-7225: Libvncserver project libvncserver integer overflow vulnerability

LLibvncserver Project · Libvncserver

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.

9.8 CVSS 3.0 Critical EPSS 6.1% · top 6.8% CWE-190 · Integer overflow
9.8CVSS 3.0 base score, v2 7.5
6.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
9Affected product versions listed by NVD
28References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

9 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.openwall.com/lists/oss-security/2018/02/18/1 ExploitMailing ListThird Party Advisory
http://www.securityfocus.com/bid/103107 Third Party AdvisoryVDB 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 ListThird 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
http://www.openwall.com/lists/oss-security/2018/02/18/1 ExploitMailing ListThird Party Advisory
http://www.securityfocus.com/bid/103107 Third Party AdvisoryVDB 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 ListThird 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

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Source: NIST National Vulnerability Database (record CVE-2018-7225), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.