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TI-2020-05679 Aliases CVE-2020-7039GHSA-fr8m-vw66-8v9r

tcp_emu in tcp_subr.c in libslirp 4.1.0, as used in QEMU 4.2.0, mismanages memory, as…

Priority LOW 31CWE-787Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Partial Red Hat: 23 fixed, 3 without a fix

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.

Summary

tcp_emu in tcp_subr.c in libslirp 4.1.0, as used in QEMU 4.2.0, mismanages memory, as demonstrated by IRC DCC commands in EMU_IRC. This can cause a heap-based buffer overflow or other out-of-bounds access which can lead to a DoS or potential execute arbitrary code.

Why it matters now

EPSS 0.03566 89th percentileScored 2026-11-07
Fix Partial Red Hat: 15 advisoriesRed Hat: 23 fixed, 3 without a fix

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 5

CPEVersionsRoleVendor
cpe:2.3:a:libslirp_project:libslirp:4.1.0:*:*:*:*:*:*:*4.1.0VulnerableLibslirp Project
cpe:2.3:a:qemu:qemu:4.2.0:*:*:*:*:*:*:*4.2.0VulnerableQEMU
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*8.0VulnerableDebian
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*9.0VulnerableDebian
cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*15.1VulnerableopenSUSE
  • cpe:2.3:a:libslirp_project:libslirp:4.1.0:*:*:*:*:*:*:* Versions 4.1.0 Vulnerable ·Libslirp Project
  • cpe:2.3:a:qemu:qemu:4.2.0:*:*:*:*:*:*:* Versions 4.2.0 Vulnerable ·QEMU
  • cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Debian
  • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
  • cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE

Remediation

Red Hat 15 advisories

  • RHSA-2020:2730 Released 2020-06-24 · Red Hat rating Important
    qemu-kvm-rhev security update
    • Red Hat OpenStack Platform 13.0 qemu-img-rhev-10:2.12.0-44.el7_8.1, qemu-kvm-common-rhev-10:2.12.0-44.el7_8.1, qemu-kvm-rhev-10:2.12.0-44.el7_8.1 +1
    • Red Hat OpenStack Platform 13.0 for RHEL 7.6 EUS Server qemu-img-rhev-10:2.12.0-18.el7_6.11, qemu-kvm-common-rhev-10:2.12.0-18.el7_6.11, qemu-kvm-rhev-10:2.12.0-18.el7_6.11 +1
  • RHSA-2020:2342 Released 2020-06-01 · Red Hat rating Important
    qemu-kvm-rhev bug fix update
    • RHV-M 4.2 qemu-img-rhev-10:2.12.0-18.el7_6.11, qemu-kvm-common-rhev-10:2.12.0-18.el7_6.11, qemu-kvm-rhev-10:2.12.0-18.el7_6.11 +1
  • RHSA-2020:1358 Released 2020-04-07 · Red Hat rating Important
    virt:rhel security and bug fix update
    • Red Hat CodeReady Linux Builder (v. 8) SLOF-20171214-6.gitfa98132.module+el8.1.0+4066+0f1aadab.src::virt-devel:rhel, hivex-1.3.15-7.module+el8.1.0+4066+0f1aadab.i686::virt-devel:rhel, hivex-devel-1.3.15-7.module+el8.1.0+4066+0f1aadab.i686::virt-devel:rhel +47
    • Red Hat Enterprise Linux AppStream (v. 8) SLOF-20171214-6.gitfa98132.module+el8.1.0+4066+0f1aadab.noarch::virt:rhel, SLOF-20171214-6.gitfa98132.module+el8.1.0+4066+0f1aadab.src::virt:rhel, hivex-1.3.15-7.module+el8.1.0+4066+0f1aadab.aarch64::virt:rhel +47
Show 12 more Red Hat advisories
  • RHSA-2020:1360 Released 2020-04-07 · Red Hat rating Important
    container-tools:1.0 security update
    • Red Hat Enterprise Linux AppStream (v. 8) buildah-1.5-6.gite94b4f9.module+el8.1.0+4908+72a45cef.aarch64::container-tools:1.0, buildah-1.5-6.gite94b4f9.module+el8.1.0+4908+72a45cef.ppc64le::container-tools:1.0, buildah-1.5-6.gite94b4f9.module+el8.1.0+4908+72a45cef.s390x::container-tools:1.0 +47
  • RHSA-2020:1352 Released 2020-04-07 · Red Hat rating Important
    qemu-kvm-ma security update
    • Red Hat Enterprise Linux Server EUS (v. 7.7) qemu-img-ma-10:2.12.0-33.el7_7.3, qemu-kvm-common-ma-10:2.12.0-33.el7_7.3, qemu-kvm-ma-10:2.12.0-33.el7_7.3 +1
    • Red Hat Enterprise Linux Server Optional EUS (v. 7.7) qemu-kvm-common-ma-10:2.12.0-33.el7_7.3, qemu-kvm-ma-10:2.12.0-33.el7_7.3, qemu-kvm-tools-ma-10:2.12.0-33.el7_7.3
  • RHSA-2020:1351 Released 2020-04-07 · Red Hat rating Important
    qemu-kvm security update
    • Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) qemu-img-10:1.5.3-167.el7_7.6, qemu-kvm-10:1.5.3-167.el7_7.6, qemu-kvm-common-10:1.5.3-167.el7_7.6 +1
    • Red Hat Enterprise Linux Server EUS (v. 7.7) qemu-img-10:1.5.3-167.el7_7.6, qemu-kvm-10:1.5.3-167.el7_7.6, qemu-kvm-common-10:1.5.3-167.el7_7.6 +1
  • RHSA-2020:1344 Released 2020-04-07 · Red Hat rating Important
    virt:rhel security update
    • Red Hat Enterprise Linux AppStream E4S (v. 8.0) SLOF-20171214-6.gitfa98132.module+el8.0.0+4084+cceb9f44.noarch::virt:rhel, SLOF-20171214-6.gitfa98132.module+el8.0.0+4084+cceb9f44.src::virt:rhel, hivex-1.3.15-7.module+el8.0.0+4084+cceb9f44.ppc64le::virt:rhel +47
  • RHSA-2020:1300 Released 2020-04-02 · Red Hat rating Important
    qemu-kvm-rhev security update
    • Red Hat OpenStack Platform 10.0 qemu-img-rhev-10:2.12.0-33.el7_7.10, qemu-kvm-common-rhev-10:2.12.0-33.el7_7.10, qemu-kvm-rhev-10:2.12.0-33.el7_7.10 +1
  • RHSA-2020:1296 Released 2020-04-02 · Red Hat rating Important
    qemu-kvm-rhev security update
    • Red Hat OpenStack Platform 13.0 qemu-img-rhev-10:2.12.0-44.el7, qemu-kvm-common-rhev-10:2.12.0-44.el7, qemu-kvm-rhev-10:2.12.0-44.el7 +1
  • RHSA-2020:1261 Released 2020-04-01 · Red Hat rating Important
    virt:8.1 security update
    • Advanced Virtualization CodeReady Builder for RHEL 8.1.1 SLOF-20190703-1.gitba1ab360.module+el8.1.1+5309+6d656f05.src::virt-devel:8.1, hivex-1.3.15-7.module+el8.1.1+5309+6d656f05.i686::virt-devel:8.1, hivex-devel-1.3.15-7.module+el8.1.1+5309+6d656f05.i686::virt-devel:8.1 +47
    • Advanced Virtualization for RHEL 8.1.1 SLOF-20190703-1.gitba1ab360.module+el8.1.1+5309+6d656f05.noarch::virt:8.1, SLOF-20190703-1.gitba1ab360.module+el8.1.1+5309+6d656f05.src::virt:8.1, hivex-1.3.15-7.module+el8.1.1+5309+6d656f05.aarch64::virt:8.1 +47
  • RHSA-2020:1150 Released 2020-03-31 · Red Hat rating Important
    qemu-kvm-ma security update
    • Red Hat Enterprise Linux Server (v. 7) qemu-img-ma-10:2.12.0-44.el7, qemu-kvm-common-ma-10:2.12.0-44.el7, qemu-kvm-ma-10:2.12.0-44.el7 +1
    • Red Hat Enterprise Linux Server Optional (v. 7) qemu-kvm-common-ma-10:2.12.0-44.el7, qemu-kvm-ma-10:2.12.0-44.el7, qemu-kvm-tools-ma-10:2.12.0-44.el7
  • RHSA-2020:1116 Released 2020-03-31 · Red Hat rating Important
    qemu-kvm security, bug fix, and enhancement update
    • Red Hat Enterprise Linux Client (v. 7) qemu-img-10:1.5.3-173.el7, qemu-kvm-10:1.5.3-173.el7, qemu-kvm-common-10:1.5.3-173.el7 +1
    • Red Hat Enterprise Linux ComputeNode Optional (v. 7) qemu-img-10:1.5.3-173.el7, qemu-kvm-10:1.5.3-173.el7, qemu-kvm-common-10:1.5.3-173.el7 +1
    • Red Hat Enterprise Linux Server (v. 7) qemu-img-10:1.5.3-173.el7, qemu-kvm-10:1.5.3-173.el7, qemu-kvm-common-10:1.5.3-173.el7 +1
    • Red Hat Enterprise Linux Workstation (v. 7) qemu-img-10:1.5.3-173.el7, qemu-kvm-10:1.5.3-173.el7, qemu-kvm-common-10:1.5.3-173.el7 +1
  • RHSA-2020:0889 Released 2020-03-17 · Red Hat rating Important
    slirp4netns security update
    • Red Hat Enterprise Linux 7 Extras slirp4netns-0.3.0-8.el7_7
  • RHSA-2020:0775 Released 2020-03-10 · Red Hat rating Important
    qemu-kvm security update
    • Red Hat Enterprise Linux Desktop (v. 6) qemu-guest-agent-2:0.12.1.2-2.506.el6_10.6, qemu-img-2:0.12.1.2-2.506.el6_10.6, qemu-kvm-2:0.12.1.2-2.506.el6_10.6 +1
    • Red Hat Enterprise Linux HPC Node (v. 6) qemu-guest-agent-2:0.12.1.2-2.506.el6_10.6, qemu-img-2:0.12.1.2-2.506.el6_10.6, qemu-kvm-2:0.12.1.2-2.506.el6_10.6 +1
    • Red Hat Enterprise Linux Server (v. 6) qemu-guest-agent-2:0.12.1.2-2.506.el6_10.6, qemu-img-2:0.12.1.2-2.506.el6_10.6, qemu-kvm-2:0.12.1.2-2.506.el6_10.6 +1
    • Red Hat Enterprise Linux Workstation (v. 6) qemu-guest-agent-2:0.12.1.2-2.506.el6_10.6, qemu-img-2:0.12.1.2-2.506.el6_10.6, qemu-kvm-2:0.12.1.2-2.506.el6_10.6 +1
  • RHSA-2020:0348 Released 2020-02-04 · Red Hat rating Important
    container-tools:rhel8 security, bug fix, and enhancement update
    • Red Hat Enterprise Linux AppStream (v. 8) buildah-1.11.6-4.module+el8.1.1+5259+bcdd613a.aarch64::container-tools:rhel8, buildah-1.11.6-4.module+el8.1.1+5259+bcdd613a.ppc64le::container-tools:rhel8, buildah-1.11.6-4.module+el8.1.1+5259+bcdd613a.s390x::container-tools:rhel8 +47

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 5AffectedNo fix planned: Out of support scope
Red Hat Enterprise Linux 7AffectedNo fix yet
Red Hat Enterprise Linux 8 Advanced VirtualizationAffectedNo fix yet
Advanced Virtualization CodeReady Builder for RHEL 8.1.1Fixed RHSA-2020:1261
Advanced Virtualization for RHEL 8.1.1Fixed RHSA-2020:1261
RHV-M 4.2Fixed RHSA-2020:2342
Red Hat CodeReady Linux Builder (v. 8)Fixed RHSA-2020:1358
Red Hat Enterprise Linux 7 ExtrasFixed RHSA-2020:0889
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2020:0348, RHSA-2020:1358, RHSA-2020:1360
Red Hat Enterprise Linux AppStream E4S (v. 8.0)Fixed RHSA-2020:1344
Red Hat Enterprise Linux Client (v. 7)Fixed RHSA-2020:1116
Red Hat Enterprise Linux ComputeNode Optional (v. 7)Fixed RHSA-2020:1116
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7)Fixed RHSA-2020:1351
Red Hat Enterprise Linux Desktop (v. 6)Fixed RHSA-2020:0775
Red Hat Enterprise Linux HPC Node (v. 6)Fixed RHSA-2020:0775
Red Hat Enterprise Linux Server (v. 6)Fixed RHSA-2020:0775
Red Hat Enterprise Linux Server (v. 7)Fixed RHSA-2020:1116, RHSA-2020:1150
Red Hat Enterprise Linux Server EUS (v. 7.7)Fixed RHSA-2020:1351, RHSA-2020:1352
Red Hat Enterprise Linux Server Optional (v. 7)Fixed RHSA-2020:1150
Red Hat Enterprise Linux Server Optional EUS (v. 7.7)Fixed RHSA-2020:1352
Red Hat Enterprise Linux Workstation (v. 6)Fixed RHSA-2020:0775
Red Hat Enterprise Linux Workstation (v. 7)Fixed RHSA-2020:1116
Red Hat OpenShift Container Platform 4.3Fixed—
Red Hat OpenStack Platform 10.0Fixed RHSA-2020:1300
Red Hat OpenStack Platform 13.0Fixed RHSA-2020:1296, RHSA-2020:2730
Red Hat OpenStack Platform 13.0 for RHEL 7.6 EUS ServerFixed RHSA-2020:2730
Not affected: 2 products
  • Red Hat Enterprise Linux 5
  • Red Hat OpenShift Container Platform 4.3

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-7039
  2. 2026-10-03 Alias added: GHSA-fr8m-vw66-8v9r

References

Patch 4

Advisory 10

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences