CVE-2024-11477

Publication date 22 November 2024

Last updated 26 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

7-Zip Zstandard Decompression Integer Underflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of 7-Zip. Interaction with this library is required to exploit this vulnerability but attack vectors may vary depending on the implementation. The specific flaw exists within the implementation of Zstandard decompression. The issue results from the lack of proper validation of user-supplied data, which can result in an integer underflow before writing to memory. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-24346.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
7zip	26.04 LTS resolute	Not affected
	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	22.04 LTS jammy	Not affected
	20.04 LTS focal	Not in release
p7zip	26.04 LTS resolute	Not in release
	25.10 questing	Not affected
	25.04 plucky	Not affected
	24.10 oracular	Not affected
	24.04 LTS noble	Not affected
	22.04 LTS jammy	Needs evaluation
	20.04 LTS focal	Ignored end of standard support, was needs-triage
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation
	14.04 LTS trusty	Ignored end of ESM support, was needs-triage

Notes

john-breton

Only affects 7-Zip versions 24.05 and 24.06.

Patch details

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

Package	Patch details
7zip	Third-party: https://github.com/TheN00bBuilder/cve-2024-11477-writeup/blob/main/CVE-2024-11477-Writeup.md
p7zip	Third-party: https://github.com/TheN00bBuilder/cve-2024-11477-writeup/blob/main/CVE-2024-11477-Writeup.md

Severity score breakdown

Parameter	Value
Base score	7.8 · High
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H