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Fencer Vulns
high 7.5

CVE-2020-7211 json

tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory traversal on Windows.

published 2020-01-21 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-28344

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.2%
EPSS 4.2% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

tftp.c in libslirp 4.1.0, as used in QEMU 4.2.0, does not prevent ..\ directory traversal on Windows.

Patch / fix

  • libslirp Debian 14, Debian 13, Debian 12 4.3.1-1

debian advisories DEBIAN-CVE-2020-7211

  • cri-o openshift 4.3 1.16.2-13.dev.rhaos4.3.gita83f883.el7
  • cri-o openshift 4.3 1.16.2-15.dev.rhaos4.3.gita83f883.el8
  • openshift openshift 4.3 4.3.1-202001310552.git.0.331f390.el7
  • openshift openshift 4.3 4.3.1-202001310552.git.0.331f390.el8
  • slirp4netns openshift 4.3 0.4.2-3.git21fdece.el8
  • openshift-clients openshift 4.3 4.3.1-202001310552.git.1.075d46a.el7
  • openshift-clients openshift 4.3 4.3.1-202001310552.git.1.075d46a.el8
  • openshift-hyperkube openshift 4.3 4.3.1-202001310552.git.0.331f390.el7

red hat advisories RHBA-2020:0390

  • xen SLE Point of Sale 11 SP3 4.2.5_22-45.36.1
  • xen SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 4.9.4_06-3.62.1
  • xen SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 4.12.2_04-3.11.1
  • xen SLES for SAP 12 SP4, SLES 12 SP4, SLE Software Development Kit 12 SP4 4.11.3_04-2.23.1
  • xen SLES for SAP 12 SP2, SLES 12 SP2-LTSS, SLES 12 SP2-BCL +1 more 4.7.6_06-43.59.1
  • xen SLES 11 SP4-LTSS 4.4.4_42-61.52.1
  • xen SLES for SAP 12 SP1, SLES 12 SP1-LTSS 4.5.5_28-22.64.1

suse advisories SUSE-SU-2020:14448-1SUSE-SU-2020:14444-1SUSE-SU-2020:1630-1SUSE-SU-2020:1139-1SUSE-SU-2020:1138-1SUSE-SU-2020:0388-1

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-2020-7211 updated cvss 3.8

QEMU: Slirp: potential directory traversal using relative paths via tftp server on Windows host

  • Red Hat OpenShift Container Platform 4.3 slirp4netns 0.4.2-3.git21fdece.el8
    fixed: vendor fix RHBA-2020:0390
  • Red Hat Enterprise Linux 5 kvm, xen Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32 Red Hat Enterprise Linux 7 qemu-img, qemu-kvm, libcacard, qemu-img-ma, qemu-kvm-ma, slirp4netns, +7 more Red Hat Enterprise Linux 8 qemu-img, qemu-kvm, slirp4netns, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, +9 more Red Hat Enterprise Linux 8 Advanced Virtualization qemu-img, qemu-kvm, qemu-kiwi, qemu-kvm-core, qemu-kvm-tests, qemu-kvm-common, +9 more Red Hat OpenShift Container Platform 4.3 skopeo 0.1.40-3.rhaos.el8, rhosp-release 16.0.0-1.el8ost, skopeo-tests 0.1.40-3.rhaos.el8, containers-common 0.1.40-3.rhaos.el8, ignition 0.34.0-2.rhaos4.3.git92f874c.el8, cri-o 1.16.2-13.dev.rhaos4.3.gita83f883.el7, +23 more
    +3 more products
    Red Hat OpenStack Platform 10 (Newton) qemu-img-rhev, qemu-kvm-rhev, qemu-kvm-tools-rhev, qemu-kvm-common-rhev Red Hat OpenStack Platform 13 (Queens) qemu-img-rhev, qemu-kvm-rhev, qemu-kvm-tools-rhev, qemu-kvm-common-rhev Red Hat Virtualization 4 qemu-kvm
    not affected: vulnerable code not present

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

4.19% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-22 Improper Limitation of a Pathname to a Restricted Directory

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.