VDB-266946 · CVE-2021-3899 · GCVE-0-2021-3899

Canonical Apport up to 2.20.x race condition

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.
7.7	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Canonical Apport up to 2.20.x. This impacts an unknown function. The manipulation results in race condition. This vulnerability is identified as CVE-2021-3899. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Canonical Apport up to 2.20.x. It has been classified as critical. Affected is an unknown functionality. The manipulation with an unknown input leads to a race condition vulnerability. CWE is classifying the issue as CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

There is a race condition in the 'replaced executable' detection that, with the correct local configuration, allow an attacker to execute arbitrary code as root.

The weakness was released by Muqing Liu. The advisory is available at bugs.launchpad.net. This vulnerability is traded as CVE-2021-3899 since 10/23/2021. The exploitability is told to be easy. The technical details are unknown and an exploit is not available.

Upgrading to version 2.21.0 eliminates this vulnerability.

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

Productinfo

Vendor

Canonical

Name

Apport

Version

License

free

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.9
VulDB Meta Temp Score: 7.7

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CNA Base Score: 7.8
CNA 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: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Apport 2.21.0

Timelineinfo

10/23/2021 🔍
06/03/2024 +954 days 🔍
06/03/2024 +0 days 🔍
08/27/2025 +449 days 🔍

Sourcesinfo

Advisory: bugs.launchpad.net
Researcher: Muqing Liu
Status: Confirmed

CVE: CVE-2021-3899 (🔍)
GCVE (CVE): GCVE-0-2021-3899
GCVE (VulDB): GCVE-100-266946

Entryinfo

Created: 06/03/2024 21:13
Updated: 08/27/2025 00:42
Changes: 06/03/2024 21:13 (53), 06/04/2024 13:20 (1), 08/19/2024 18:36 (12), 08/27/2025 00:42 (9)
Complete: 🔍
Cache ID: 216::103