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CVE-2020-1983

20
FAUCET Score

CVE-2020-1983 describes a use-after-free vulnerability in the ip_reass() function of libslirp versions 4.2.0 and earlier, impacting products from vendors like Canonical, Debian, and Fedora. This medium-severity flaw (CVSS 6.5) can be triggered by a local attacker sending crafted packets, leading to a denial of service. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.2.0CPE matchmatch criteria
cpe:2.3:a:libslirp_project:libslirp:*:*:*:*:*:*:*:*
31CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:*
32CPE matchmatch criteria
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
8.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
9.0CPE matchmatch criteria
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.29%
Probability of exploitation in next 30 days
EPSS Percentile
81.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0229 is in the 99th percentile among its peer group of 15,937 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (18)

redhatpatch availablevia redhat_api
Product: Advanced Virtualization for RHEL 8.2.1Fixed in: virt-devel:8.2-8020120200707202843.11e3e113
View patch
redhatpatch availablevia redhat_api
Product: Advanced Virtualization for RHEL 8.1.1Fixed in: virt:8.1-8010120200911011910.5db1954d
View patch
redhatpatch availablevia redhat_api
Product: Advanced Virtualization for RHEL 8.1.1Fixed in: virt-devel:8.1-8010120200911011910.5db1954d
View patch
redhatpatch availablevia redhat_api
Product: Advanced Virtualization for RHEL 8.2.1Fixed in: virt:8.2-8020120200707202843.11e3e113
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: qemu-kvm-10:1.5.3-175.el7_9.1
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: qemu-kvm-ma-10:2.12.0-48.el7_9.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: container-tools:rhel8-8020120200601155013.ffd2803a
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: virt-devel:rhel-8030020200909014558.30b713e6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: virt:rhel-8030020200909014558.30b713e6
View patch
redhatpatch availablevia redhat_api
Product: Red Hat OpenStack Platform 13.0 (Queens)Fixed in: qemu-kvm-rhev-10:2.12.0-48.el7_9.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization 4 for Red Hat Enterprise Linux 7Fixed in: qemu-kvm-rhev-10:2.12.0-48.el7_9.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Virtualization Engine 4.3Fixed in: qemu-kvm-rhev-10:2.12.0-48.el7_9.2
View patch
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: container-tools:2.0/slirp4netns
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 8 Advanced VirtualizationFixed in: virt:8.1/qemu-kvm
redhatno patchvia redhat_api
Product: Red Hat Enterprise Linux 8 Advanced VirtualizationFixed in: virt:8.2/qemu-kvm
redhatno patchvia redhat_api
Product: Red Hat OpenShift Container Platform 4Fixed in: slirp4netns
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: qemu-kvm
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: slirp4netns

Vendor Advisories (1)

redhatCVE-2020-1983Moderate

QEMU: slirp: use-after-free in ip_reass() function in ip_input.c

Apr 2, 2020

References

lists.opensuse.org / opensuse-security-announce/2020-05/msg00022.html
Mailing ListThird Party Advisory
lists.opensuse.org / opensuse-security-announce/2020-06/msg00001.html
Mailing ListThird Party Advisory
gitlab.freedesktop.org / slirp/libslirp/-/commit/9ac0371bb8c0a40f5d9f82a1c25129660e81df04
PatchThird Party Advisory
gitlab.freedesktop.org / slirp/libslirp/-/issues/20
ExploitThird Party Advisory
lists.debian.org / debian-lts-announce/2020/06/msg00032.html
Mailing ListThird Party Advisory
lists.debian.org / debian-lts-announce/2020/07/msg00020.html
Mailing ListThird Party Advisory
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/HWFD4MWV3YWIHVHSA2F7FKOLJFL4PHOX
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/NKT2MTSINE4NUPG5L6BYH6N23NBNITOL
usn.ubuntu.com / 4372-1
Third Party Advisory
debian.org / security/2020/dsa-4665
Third Party Advisory