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Fencer Vulns
medium 6.3

CVE-2020-25653 json

A race condition vulnerability was found in the way the spice-vdagentd daemon handled new client connections.

published 2020-11-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-18317

cvss
6.3
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

A race condition vulnerability was found in the way the spice-vdagentd daemon handled new client connections. This flaw may allow an unprivileged local guest user to become the active agent for spice-vdagentd, possibly resulting in a denial of service or information leakage from the host. The highest threat from this vulnerability is to data confidentiality as well as system availability. This flaw affects spice-vdagent versions 0.20 and prior.

Patch / fix

  • spice-vdagent Debian 14, Debian 13, Debian 12 0.20.0-2

debian advisories DEBIAN-CVE-2020-25653

  • spice-vdagent Ubuntu 18.04 LTS 0.17.0-1ubuntu2.2
  • spice-vdagent Ubuntu 20.04 LTS 0.19.0-2ubuntu0.2

ubuntu advisories UBUNTU-CVE-2020-25653

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • spice-vdagent RHEL 8 0.20.0-3.el8

red hat advisories RHSA-2021:1791

  • spice-vdagent SLES for SAP 15 SP1, SLES for SAP 15, SLES 15-LTSS +10 more 0.17.0-4.3.1
  • spice-vdagent SLES for SAP 12 SP5, SLES 12 SP5 0.16.0-8.8.2
  • spice-vdagent SLE Module for Desktop Applications 15 SP3 0.21.0-3.3.1
  • spice-vdagent SLE Module for Desktop Applications 15 SP2 0.19.0-3.3.1

suse advisories SUSE-SU-2021:2803-1SUSE-SU-2021:2766-1SUSE-SU-2021:2614-1SUSE-SU-2020:3268-1

  • spice-vdagent openSUSE Leap 15.3 0.21.0-3.3.1

opensuse advisories openSUSE-SU-2021:2614-1

  • spice-vdagent AlmaLinux 8 0.20.0-3.el8

almalinux advisories ALSA-2021:1791

  • spice-vdagent Rocky Linux 8 0.20.0-3.el8

rocky linux advisories RLSA-2021:1791

  • spice-vdagent CBL-Mariner 2.0 0.22.1-1

azure linux advisories AZL-7365

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

  • spice-vdagent Arch Linux 0.21.0-1

arch linux advisories AVG-1303

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-25653 updated cvss 6.4

spice-vdagent: UNIX domain socket peer PID retrieved via SO_PEERCRED is subject to race condition

  • Red Hat Enterprise Linux 6 spice-vdagent Red Hat Enterprise Linux 7 spice-vdagent
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) spice-vdagent 0.20.0-3.el8
    fixed: vendor fix RHSA-2021:1791

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • openwall.com https://www.openwall.com/lists/oss-security/2020/11/04/1 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 6.3 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
NVD 2.0 5.4 AV:L/AC:M/Au:N/C:P/I:N/A:C

Affected products

  • n/a spice-vdagent

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.