CVE-2021-33640

After tar_close(), libtar.c releases the memory pointed to by pointer t. After tar_close() is called in the list() function, it continues to use pointer t: free_longlink_longname(t->th_buf) . As a result, the released memory is used (use-after-free).

CVSS v3 6.2 MEDIUM

6.2^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.5 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S4PJRCJLEAWN2EKXGLSOBTL7O57V7NC/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WX5YE66CT7Y5C2HTHXSFDKQWYWYWJ2T/
https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2021-33640&packageName=libtar	Vendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4S4PJRCJLEAWN2EKXGLSOBTL7O57V7NC/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7WX5YE66CT7Y5C2HTHXSFDKQWYWYWJ2T/
https://www.openeuler.org/en/security/cve/detail/?cveId=CVE-2021-33640&packageName=libtar	Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:o:openatom:openeuler:20.03:sp1:::lts:::*
	cpe:2.3:o:openatom:openeuler:20.03:sp2:::lts:::*
	cpe:2.3:o:openatom:openeuler:22.03::::lts:::

Configuration 2 (hide)

OR	cpe:2.3:o:fedoraproject:fedora:36:::::::*
	cpe:2.3:o:fedoraproject:fedora:37:::::::*

History

02 Apr 2025, 18:33

Type	Values Removed	Values Added
First Time		Openatom openeuler Openatom
CPE	cpe:2.3:o:huawei:openeuler:22.03::::lts::: cpe:2.3:o:huawei:openeuler:20.03:sp2:::lts:::* cpe:2.3:o:huawei:openeuler:20.03:sp1:::lts:::*	cpe:2.3:o:openatom:openeuler:22.03::::lts::: cpe:2.3:o:openatom:openeuler:20.03:sp2:::lts:::* cpe:2.3:o:openatom:openeuler:20.03:sp1:::lts:::*

Information

Published : 2022-12-19 16:15

Updated : 2025-04-02 18:33

NVD link : CVE-2021-33640

Mitre link : CVE-2021-33640

CVE.ORG link : CVE-2021-33640

JSON object : View

Products Affected

fedoraproject

fedora

openatom

openeuler

CWE

CWE-416

Use After Free

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