Integer Overflow or Wraparound Affecting libvncserver package, versions <0.9.11+dfsg-1ubuntu1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU2510-LIBVNCSERVER-14156289
- published2 Dec 2025
- disclosed19 Feb 2018
Introduced: 19 Feb 2018
CVE-2018-7225 (opens in a new tab)How to fix?
Upgrade Ubuntu:25.10 libvncserver to version 0.9.11+dfsg-1ubuntu1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream libvncserver package and not the libvncserver package as distributed by Ubuntu.
See How to fix? for Ubuntu:25.10 relevant fixed versions and status.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2018-7225
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7225
- https://www.debian.org/security/2018/dsa-4221
- https://lists.debian.org/debian-lts-announce/2018/03/msg00035.html
- https://security-tracker.debian.org/tracker/CVE-2018-7225
- https://security.gentoo.org/glsa/201908-05
- https://github.com/LibVNC/libvncserver/issues/218
- 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
- http://www.openwall.com/lists/oss-security/2018/02/18/1
- https://access.redhat.com/errata/RHSA-2018:1055
- http://www.securityfocus.com/bid/103107
- https://usn.ubuntu.com/4547-1/
- https://usn.ubuntu.com/4573-1/
- https://usn.ubuntu.com/4587-1/
- https://usn.ubuntu.com/3618-1/