libslirp: use after free vulnerability cause a denial of service.
Published Apr 22, 2020
7.5
HIGHCVSS 3.1
EPSS 2.36%
Description
A use after free vulnerability in ip_reass() in ip_input.c of libslirp 4.2.0 and prior releases allows crafted packets to cause a denial of service.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<=4.2.0
- Version
Configuration 1
- ≤ 4.2.0
Configuration 2
- 31
- 32
Configuration 3
- 8.0
- 9.0
Configuration 5
- 16.04
- 18.04
- 19.10
- 20.04
No data.
Advanced Virtualization for RHEL 8.1.1
virt-devel:8.1-8010120200911011910.5db1954d
Fixed · RHSA-2020:4290
Advanced Virtualization for RHEL 8.1.1
virt:8.1-8010120200911011910.5db1954d
Fixed · RHSA-2020:4290
Advanced Virtualization for RHEL 8.2.1
virt-devel:8.2-8020120200707202843.11e3e113
Fixed · RHBA-2020:3172
Advanced Virtualization for RHEL 8.2.1
virt:8.2-8020120200707202843.11e3e113
Fixed · RHBA-2020:3172
Red Hat Enterprise Linux 7
qemu-kvm-10:1.5.3-175.el7_9.1
Fixed · RHSA-2020:4079
Red Hat Enterprise Linux 7
qemu-kvm-ma-10:2.12.0-48.el7_9.2
Fixed · RHSA-2021:0346
Red Hat Enterprise Linux 8
container-tools:rhel8-8020120200601155013.ffd2803a
Fixed · RHSA-2020:3053
Red Hat Enterprise Linux 8
virt-devel:rhel-8030020200909014558.30b713e6
Fixed · RHSA-2020:4676
Red Hat Enterprise Linux 8
virt:rhel-8030020200909014558.30b713e6
Fixed · RHSA-2020:4676
Red Hat OpenStack Platform 13.0 (Queens)
qemu-kvm-rhev-10:2.12.0-48.el7_9.2
Fixed · RHSA-2021:0934
Red Hat Virtualization 4 for Red Hat Enterprise Linux 7
qemu-kvm-rhev-10:2.12.0-48.el7_9.2
Fixed · RHSA-2021:0459
Red Hat Virtualization Engine 4.3
qemu-kvm-rhev-10:2.12.0-48.el7_9.2
Fixed · RHSA-2021:0459
Red Hat Enterprise Linux 5
kvm
Out of support scope
Red Hat Enterprise Linux 6
qemu-kvm
Will not fix
Red Hat Enterprise Linux 7
slirp4netns
Will not fix
Red Hat Enterprise Linux 8
container-tools:1.0/slirp4netns
Out of support scope
Red Hat Enterprise Linux 8
container-tools:2.0/slirp4netns
Affected
Red Hat Enterprise Linux 8 Advanced Virtualization
virt:8.1/qemu-kvm
Affected
Red Hat Enterprise Linux 8 Advanced Virtualization
virt:8.2/qemu-kvm
Affected
Red Hat Enterprise Linux 8 Advanced Virtualization
virt:8.3/qemu-kvm
Not affected
Red Hat Enterprise Linux 9
qemu-kvm
Not affected
Red Hat OpenShift Container Platform 4
slirp4netns
Affected
Red Hat OpenStack Platform 10 (Newton)
qemu-kvm-rhev
Out of support scope
| Product | Package | State | Advisory |
|---|---|---|---|
| Advanced Virtualization for RHEL 8.1.1 | virt-devel:8.1-8010120200911011910.5db1954d | Fixed | RHSA-2020:4290 |
| Advanced Virtualization for RHEL 8.1.1 | virt:8.1-8010120200911011910.5db1954d | Fixed | RHSA-2020:4290 |
| Advanced Virtualization for RHEL 8.2.1 | virt-devel:8.2-8020120200707202843.11e3e113 | Fixed | RHBA-2020:3172 |
| Advanced Virtualization for RHEL 8.2.1 | virt:8.2-8020120200707202843.11e3e113 | Fixed | RHBA-2020:3172 |
| Red Hat Enterprise Linux 7 | qemu-kvm-10:1.5.3-175.el7_9.1 | Fixed | RHSA-2020:4079 |
| Red Hat Enterprise Linux 7 | qemu-kvm-ma-10:2.12.0-48.el7_9.2 | Fixed | RHSA-2021:0346 |
| Red Hat Enterprise Linux 8 | container-tools:rhel8-8020120200601155013.ffd2803a | Fixed | RHSA-2020:3053 |
| Red Hat Enterprise Linux 8 | virt-devel:rhel-8030020200909014558.30b713e6 | Fixed | RHSA-2020:4676 |
| Red Hat Enterprise Linux 8 | virt:rhel-8030020200909014558.30b713e6 | Fixed | RHSA-2020:4676 |
| Red Hat OpenStack Platform 13.0 (Queens) | qemu-kvm-rhev-10:2.12.0-48.el7_9.2 | Fixed | RHSA-2021:0934 |
| Red Hat Virtualization 4 for Red Hat Enterprise Linux 7 | qemu-kvm-rhev-10:2.12.0-48.el7_9.2 | Fixed | RHSA-2021:0459 |
| Red Hat Virtualization Engine 4.3 | qemu-kvm-rhev-10:2.12.0-48.el7_9.2 | Fixed | RHSA-2021:0459 |
| Red Hat Enterprise Linux 5 | kvm | Out of support scope | n/a |
| Red Hat Enterprise Linux 6 | qemu-kvm | Will not fix | n/a |
| Red Hat Enterprise Linux 7 | slirp4netns | Will not fix | n/a |
| Red Hat Enterprise Linux 8 | container-tools:1.0/slirp4netns | Out of support scope | n/a |
| Red Hat Enterprise Linux 8 | container-tools:2.0/slirp4netns | Affected | n/a |
| Red Hat Enterprise Linux 8 Advanced Virtualization | virt:8.1/qemu-kvm | Affected | n/a |
| Red Hat Enterprise Linux 8 Advanced Virtualization | virt:8.2/qemu-kvm | Affected | n/a |
| Red Hat Enterprise Linux 8 Advanced Virtualization | virt:8.3/qemu-kvm | Not affected | n/a |
| Red Hat Enterprise Linux 9 | qemu-kvm | Not affected | n/a |
| Red Hat OpenShift Container Platform 4 | slirp4netns | Affected | n/a |
| Red Hat OpenStack Platform 10 (Newton) | qemu-kvm-rhev | Out of support scope | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
AV:L/AC:L/Au:N/C:N/I:N/A:P
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
- EPSS v4
Table of values (12 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.36% (0.02357) | 83.13th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.29% (0.02293) | 80.92th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.41% (0.00408) | 59.12th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.06% (0.00056) | 25.33th | v3 (v2023.03.01) |
| Jun 18, 2024 | 0.06% (0.00056) | 23.50th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.06% (0.00056) | 21.49th | v3 (v2023.03.01) |
| Mar 6, 2023 | 4.80% (0.04804) | 89.26th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.80% (0.04804) | 74.65th | v2 (v2022.01.01) |
| Feb 3, 2022 | 11.51% (0.11512) | 88.34th | v1 |
| Jan 6, 2022 | 11.51% (0.11512) | 88.20th | v1 |
| Jan 5, 2022 | 2.82% (0.02818) | 81.08th | v5 (v2026.06.15) |
| Apr 14, 2021 | 2.82% (0.02818) | 0.00th | v1 |
References (14)
- http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00022.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00001.html vendor-advisoryx_refsource_SUSEMailing ListThird Party Advisory
- https://access.redhat.com/security/cve/CVE-2020-1983 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1829825 Issue Tracking
- https://gitlab.freedesktop.org/slirp/libslirp/-/commit/9ac0371bb8c0a40f5d9f82a1c25129660e81df04 x_refsource_MISCPatchThird Party Advisory
- https://gitlab.freedesktop.org/slirp/libslirp/-/issues/20 x_refsource_MISCExploitThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/06/msg00032.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00020.html mailing-listx_refsource_MLISTMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HWFD4MWV3YWIHVHSA2F7FKOLJFL4PHOX/ vendor-advisoryx_refsource_FEDORA
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NKT2MTSINE4NUPG5L6BYH6N23NBNITOL/ vendor-advisoryx_refsource_FEDORA
- https://nvd.nist.gov/vuln/detail/CVE-2020-1983
- https://usn.ubuntu.com/4372-1/ vendor-advisoryx_refsource_UBUNTUThird Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2020-1983
- https://www.debian.org/security/2020/dsa-4665 vendor-advisoryx_refsource_DEBIANThird Party Advisory
Change history (0)
No recorded changes yet.