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Vulnerability record · CVE-2020-1983 · published 22 April 2020

CVE-2020-1983: Libslirp project libslirp use after free vulnerability

LLibslirp Project · Libslirp

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.

6.5 CVSS 3.1 Medium EPSS 2.4% · top 16.9% CWE-416 · Use after free
6.5CVSS 3.1 base score, v2 2.1
2.4%EPSS exploitation probability, 30 days
NoNot in CISA KEV
5Affected product versions listed by NVD
20References, 2 tagged exploit
17 Jun 2026Last modified by 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.

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

Affected products

5 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00022.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00001.html Mailing ListThird Party Advisory
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/9ac0371bb8c0a40f5d9f82a1c25129660e81df04 PatchThird Party Advisory
https://gitlab.freedesktop.org/slirp/libslirp/-/issues/20 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/06/msg00032.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00020.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HWFD4MWV3YWIHVHSA2F7FKO
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NKT2MTSINE4NUPG5L6BYH6N
https://usn.ubuntu.com/4372-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4665 Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00022.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00001.html Mailing ListThird Party Advisory
https://gitlab.freedesktop.org/slirp/libslirp/-/commit/9ac0371bb8c0a40f5d9f82a1c25129660e81df04 PatchThird Party Advisory
https://gitlab.freedesktop.org/slirp/libslirp/-/issues/20 ExploitThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/06/msg00032.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00020.html Mailing ListThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HWFD4MWV3YWIHVHSA2F7FKO
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NKT2MTSINE4NUPG5L6BYH6N
https://usn.ubuntu.com/4372-1/ Third Party Advisory
https://www.debian.org/security/2020/dsa-4665 Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-1983), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.