Vulnerability · Published Nov 27, 2020 · Assigned by redhat
CVE-2020-25708
High 7.5
In plain English
A high-severity security flaw in libvncserver. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.6% (higher than 76% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS NVD)7.5High
Exploit odds (30 days)1.6%top 23.6% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
A divide by zero issue was found to occur in libvncserver-0.9.12. A malicious client could use this flaw to send a specially crafted message that, when processed by the VNC server, would lead to a floating point exception, resulting in a denial of service.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | libvncserver | 0.9.11-17.el8 | ALSA-2021:1811 |
| AlmaLinux:8 | libvncserver-devel | 0.9.11-17.el8 | ALSA-2021:1811 |
| Alpine:v3.20 | libvncserver | 0.9.13-r0 | ALPINE-CVE-2020-25708 |
| Alpine:v3.21 | libvncserver | 0.9.13-r0 | ALPINE-CVE-2020-25708 |
| Alpine:v3.22 | libvncserver | 0.9.13-r0 | ALPINE-CVE-2020-25708 |
| Alpine:v3.23 | libvncserver | 0.9.13-r0 | ALPINE-CVE-2020-25708 |
| Alpine:v3.24 | libvncserver | 0.9.13-r0 | ALPINE-CVE-2020-25708 |
| Debian:12 | libvncserver | 0.9.13+dfsg-1 | DEBIAN-CVE-2020-25708 |
| Debian:13 | libvncserver | 0.9.13+dfsg-1 | DEBIAN-CVE-2020-25708 |
| Debian:14 | libvncserver | 0.9.13+dfsg-1 | DEBIAN-CVE-2020-25708 |
| Rocky Linux:8 | libvncserver | 0:0.9.11-17.el8 | RLSA-2021:1811 |
| Ubuntu:22.04:LTS | tightvnc | no fix listed | UBUNTU-CVE-2020-25708 |
| Ubuntu:24.04:LTS | tightvnc | no fix listed | UBUNTU-CVE-2020-25708 |
| Ubuntu:25.10 | tightvnc | no fix listed | UBUNTU-CVE-2020-25708 |
| Ubuntu:26.04:LTS | tightvnc | no fix listed | UBUNTU-CVE-2020-25708 |
| Ubuntu:26.10 | tightvnc | no fix listed | UBUNTU-CVE-2020-25708 |
| Ubuntu:22.04:LTS | veyon | no fix listed | UBUNTU-CVE-2020-25708 |
| Ubuntu:24.04:LTS | veyon | no fix listed | UBUNTU-CVE-2020-25708 |
| Ubuntu:25.10 | veyon | no fix listed | UBUNTU-CVE-2020-25708 |
| Ubuntu:26.04:LTS | veyon | no fix listed | UBUNTU-CVE-2020-25708 |
| Ubuntu:26.10 | veyon | no fix listed | UBUNTU-CVE-2020-25708 |
| Ubuntu:22.04:LTS | vino | 3.22.0-6ubuntu3 | UBUNTU-CVE-2020-25708 |
| Ubuntu:24.04:LTS | vino | 3.22.0-6ubuntu3 | UBUNTU-CVE-2020-25708 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| n/a | libvncserver | libvncserver 0.9.12 |
Weakness: CWE-369
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1896739 x_refsource_MISC
- [debian-lts-announce] 20220929 [SECURITY] [DLA 3125-1] libvncserver security update mailing-list, x_refsource_MLIST