libtar th_read memory leak

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability described as problematic has been identified in libtar. Affected by this issue is the function th_read. The manipulation results in memory leak. This vulnerability is cataloged as CVE-2021-33645. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as problematic has been found in libtar (unknown version). Affected is the function th_read. The manipulation with an unknown input leads to a memory leak vulnerability. CWE is classifying the issue as CWE-401. The product does not sufficiently track and release allocated memory after it has been used, which slowly consumes remaining memory. This is going to have an impact on availability. CVE summarizes:

The th_read() function doesn’t free a variable t->th_buf.gnu_longlink after allocating memory, which may cause a memory leak.

The weakness was shared 08/11/2022. The advisory is shared for download at openeuler.org. This vulnerability is traded as CVE-2021-33645 since 05/28/2021. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 214740 (Debian dla-4033 : libtar-dev - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (214740) and CERT Bund (WID-SEC-2023-1238). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Oracle Linux
  • Red Hat Enterprise Linux
  • RESF Rocky Linux

Productinfo

Name

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory leak
CWE: CWE-401 / CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 214740
Nessus Name: Debian dla-4033 : libtar-dev - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/28/2021 🔍
08/11/2022 +440 days 🔍
08/11/2022 +0 days 🔍
01/04/2026 +1242 days 🔍

Sourcesinfo

Advisory: openeuler.org
Status: Confirmed

CVE: CVE-2021-33645 (🔍)
GCVE (CVE): GCVE-0-2021-33645
GCVE (VulDB): GCVE-100-206064
CERT Bund: WID-SEC-2023-1238 - Red Hat Enterprise Linux: Mehrere Schwachstellen in verschiedenen Komponenten

Entryinfo

Created: 08/11/2022 07:17
Updated: 01/04/2026 02:16
Changes: 08/11/2022 07:17 (37), 09/04/2022 13:45 (11), 01/29/2025 06:32 (16), 04/02/2025 21:00 (1), 04/30/2025 12:55 (3), 11/05/2025 05:47 (1), 01/04/2026 02:16 (7)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.

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