VDB-197634 · CVE-2021-42779 · Nessus 213413

OpenSC up to 0.21.x sc_file_valid 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.
5.3	$0-$5k	0.00

Summaryinfo

A vulnerability labeled as critical has been found in OpenSC up to 0.21.x. This affects the function sc_file_valid. The manipulation results in use after free. This vulnerability is cataloged as CVE-2021-42779. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, was found in OpenSC up to 0.21.x. Affected is the function sc_file_valid. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. This is going to have an impact on confidentiality, integrity, and availability.

The weakness was shared 04/18/2022. The advisory is available at bugs.chromium.org. This vulnerability is traded as CVE-2021-42779 since 10/21/2021. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 213413 (Debian dla-4004 : opensc - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.22.0 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (213413). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Name

OpenSC

Version

License

open-source

Website

Product: https://github.com/OpenSC/OpenSC/

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

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

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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: 213413
Nessus Name: Debian dla-4004 : opensc - security update

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenSC 0.22.0
Patch: github.com

Timelineinfo

10/21/2021 🔍
04/18/2022 +179 days 🔍
04/18/2022 +0 days 🔍
11/04/2025 +1296 days 🔍

Sourcesinfo

Product: github.com

Advisory: bugs.chromium.org
Status: Confirmed

CVE: CVE-2021-42779 (🔍)
GCVE (CVE): GCVE-0-2021-42779
GCVE (VulDB): GCVE-100-197634

Entryinfo

Created: 04/18/2022 22:11
Updated: 11/04/2025 13:50
Changes: 04/18/2022 22:11 (39), 04/21/2022 14:33 (1), 12/28/2024 21:46 (16), 11/04/2025 13:50 (18)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.