What’s Vulnerable › Vulnerabilities

CVE-2020-1983: libslirp: use after free vulnerability cause a denial of service.

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.4% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-04-22 · updated 2026-06-17
• Weakness: CWE-416

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

• Canonical Ubuntu Linux: 16.04, 18.04, 19.10, 20.04
• Debian Linux: 8.0, 9.0
• Fedoraproject Fedora: 31, 32
• Libslirp Project Libslirp: through 4.2.0
• openSUSE Leap: 15.1

References

• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00022.html
• http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00001.html
• https://gitlab.freedesktop.org/slirp/libslirp/-/commit/9ac0371bb8c0a40f5d9f82a1c25129660e81df04
• https://gitlab.freedesktop.org/slirp/libslirp/-/issues/20
• https://lists.debian.org/debian-lts-announce/2020/06/msg00032.html
• https://lists.debian.org/debian-lts-announce/2020/07/msg00020.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HWFD4MWV3YWIHVHSA2F7FKOLJFL4PHOX/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NKT2MTSINE4NUPG5L6BYH6N23NBNITOL/
• https://usn.ubuntu.com/4372-1/
• https://www.debian.org/security/2020/dsa-4665
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00022.html
• http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00001.html

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