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Fencer Vulns
medium 6.4

CVE-2020-25651 json

A flaw was found in the SPICE file transfer protocol.

published 2020-11-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-18315

cvss
6.4
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 21%
public exploits
0
none known

Summary

A flaw was found in the SPICE file transfer protocol. File data from the host system can end up in full or in parts in the client connection of an illegitimate local user in the VM system. Active file transfers from other users could also be interrupted, resulting in a denial of service. 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-2020-25651

  • 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-2020-25651

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-7363

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-2020-25651 updated cvss 6.4

spice-vdagent: possible file transfer DoS and information leak via active_xfers hash map

  • 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

0.29% chance of exploitation in the next 30 days, higher than 21% 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 6.4 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:L
NVD 2.0 3.3 AV:L/AC:M/Au:N/C:P/I:N/A:P

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.