CVE-2020-1983

Publication date 22 April 2020

Last updated 18 August 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Status

Package Ubuntu Release Status
libslirp 25.10 questing
Fixed 4.1.0-2ubuntu2
25.04 plucky
Fixed 4.1.0-2ubuntu2
24.10 oracular
Fixed 4.1.0-2ubuntu2
24.04 LTS noble
Fixed 4.1.0-2ubuntu2
23.10 mantic
Fixed 4.1.0-2ubuntu2
23.04 lunar
Fixed 4.1.0-2ubuntu2
22.10 kinetic
Fixed 4.1.0-2ubuntu2
22.04 LTS jammy
Fixed 4.1.0-2ubuntu2
21.10 impish
Fixed 4.1.0-2ubuntu2
21.04 hirsute
Fixed 4.1.0-2ubuntu2
20.10 groovy
Fixed 4.1.0-2ubuntu2
20.04 LTS focal
Fixed 4.1.0-2ubuntu2
19.10 eoan Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
qemu 25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute
Not affected
20.10 groovy
Not affected
20.04 LTS focal
Not affected
19.10 eoan
Fixed 1:4.0+dfsg-0ubuntu9.6
18.04 LTS bionic
Fixed 1:2.11+dfsg-1ubuntu7.26
16.04 LTS xenial
Fixed 1:2.5+dfsg-5ubuntu10.44
14.04 LTS trusty
Fixed 2.0.0+dfsg-2ubuntu1.47+esm4
qemu-kvm 25.10 questing Not in release
25.04 plucky Not in release
24.10 oracular Not in release
24.04 LTS noble Not in release
23.10 mantic Not in release
23.04 lunar Not in release
22.10 kinetic Not in release
22.04 LTS jammy Not in release
21.10 impish Not in release
21.04 hirsute Not in release
20.10 groovy Not in release
20.04 LTS focal Not in release
19.10 eoan Not in release
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release
slirp4netns 25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish
Not affected
21.04 hirsute
Not affected
20.10 groovy
Not affected
20.04 LTS focal
Needs evaluation
19.10 eoan Ignored end of life
18.04 LTS bionic Not in release
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
libslirp

Severity score breakdown

Parameter Value
Base score 7.5 · High
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

Other references