VDB-179293 · CVE-2021-36976 · Nessus 210823

libarchive up to 3.5.1 copy_string use after free

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.9	$0-$5k	0.00

Summaryinfo

A vulnerability identified as critical has been detected in libarchive up to 3.5.1. This issue affects the function copy_string. This manipulation causes use after free. This vulnerability appears as CVE-2021-36976. There is no available exploit.

Detailsinfo

A vulnerability has been found in libarchive up to 3.5.1 (File Compression Software) and classified as critical. Affected by this vulnerability is the function copy_string. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was presented 07/21/2021. The advisory is shared at bugs.chromium.org. This vulnerability is known as CVE-2021-36976. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 210823 (Debian dla-3950 : libarchive-dev - security update), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at Tenable (210823). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

File Compression Software

Name

libarchive

Version

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 210823
Nessus Name: Debian dla-3950 : libarchive-dev - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

07/20/2021 🔍
07/21/2021 +1 days 🔍
07/21/2021 +0 days 🔍
11/04/2025 +1567 days 🔍

Sourcesinfo

Advisory: bugs.chromium.org
Status: Not defined

CVE: CVE-2021-36976 (🔍)
GCVE (CVE): GCVE-0-2021-36976
GCVE (VulDB): GCVE-100-179293

Entryinfo

Created: 07/21/2021 11:50
Updated: 11/04/2025 05:42
Changes: 07/21/2021 11:50 (36), 07/26/2021 03:43 (2), 11/13/2024 04:14 (16), 11/04/2025 05:42 (19)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.