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MEDIUM

CVE-2020-1983

CVSS v3

6.5

MEDIUM

EPSS Score

2.4 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • hivexAlmaLinux:8all versions · fixed in 1.3.18-20.module_el8.3.0+2048+e7a0a3eaand 6 other packages
  • libguestfs-winsupportAlmaLinux:8all versions · fixed in 8.2-1.module_el8.3.0+2048+e7a0a3ea
  • libiscsiAlmaLinux:8all versions · fixed in 1.18.0-8.module_el8.3.0+2048+e7a0a3ea
  • libiscsi-develAlmaLinux:8all versions · fixed in 1.18.0-8.module_el8.5.0+2608+72063365and 1 other package
  • libvirtAlmaLinux:8all versions · fixed in 6.0.0-28.module_el8.3.0+2048+e7a0a3eaand 24 other packages
  • libvirt-dbusAlmaLinux:8all versions · fixed in 1.3.0-2.module_el8.5.0+2608+72063365
  • nbdfuseAlmaLinux:8all versions · fixed in 1.2.2-1.module_el8.5.0+2608+72063365and 1 other package
  • nbdkitAlmaLinux:8all versions · fixed in 1.16.2-4.module_el8.5.0+2608+72063365and 13 other packages

14 more package ranges on OSV.dev

Vendor advisories

  • CVE-2020-1983 Red Hat Product Security2,907 products fixed · 53 known affected

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

    kvm.src as a component of Red Hat Enterprise Linux 5 · qemu-guest-agent as a component of Red Hat Enterprise Linux 6 · qemu-guest-agent-win32 as a component of Red Hat Enterprise Linux 6

  • RHSA-2021:0934 Red Hat Product Security11 products fixed

    Red Hat Security Advisory: qemu-kvm-rhev security update

  • RHSA-2021:0459 Red Hat Product Security17 products fixed

    Red Hat Security Advisory: qemu-kvm-rhev security update

  • RHSA-2021:0346 Red Hat Product Security17 products fixed

    Red Hat Security Advisory: qemu-kvm-ma security update

  • RHSA-2020:4676 Red Hat Product Security838 products fixed

    Red Hat Security Advisory: virt:rhel and virt-devel:rhel security, bug fix, and enhancement update

  • RHSA-2020:4290 Red Hat Product Security909 products fixed

    Red Hat Security Advisory: virt:8.1 and virt-devel:8.1 security update

3 more advisories

Full record on NVD

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.

Technical details

Published
2020-04-22

Frequently asked questions

What is CVE-2020-1983?

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.

Is CVE-2020-1983 actively exploited?

Active exploitation of CVE-2020-1983 has not been confirmed. Its EPSS score was 2.4% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-1983?

CVE-2020-1983 has a CVSS v3 base score of 6.5 (MEDIUM severity).

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