VDB-182852 · CVE-2021-3803 · WID-SEC-2026-1955

nth-check incorrect regex

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.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability described as critical has been identified in nth-check. Affected is an unknown function. Such manipulation leads to incorrect regex. This vulnerability is uniquely identified as CVE-2021-3803. The attack can be launched remotely. No exploit exists. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in nth-check (unknown version). It has been rated as critical. Affected by this issue is an unknown code block. The manipulation with an unknown input leads to a incorrect regex vulnerability. Using CWE to declare the problem leads to CWE-185. The product specifies a regular expression in a way that causes data to be improperly matched or compared. Impacted is availability.

The weakness was disclosed 09/17/2021 as 9894c1d2010870c351f66c6f6efcf656e26bb726. The advisory is shared for download at huntr.dev. This vulnerability is handled as CVE-2021-3803 since 09/15/2021. There are neither technical details nor an exploit publicly available.

Applying the patch 9894c1d2010870c351f66c6f6efcf656e26bb726 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the vulnerability database at CERT Bund (WID-SEC-2026-1955). Once again VulDB remains the best source for vulnerability data.

Affected

Red Hat Enterprise Linux
Atlassian Bamboo
Atlassian Bitbucket
Atlassian Confluence
Atlassian Fisheye
Atlassian Crucible
Atlassian Jira

Productinfo

Name

nth-check

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.3

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 7.5
CNA Vector (huntr.dev): 🔍

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: Incorrect regex
CWE: CWE-185 / CWE-697
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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: 9894c1d2010870c351f66c6f6efcf656e26bb726

Timelineinfo

09/15/2021 🔍
09/17/2021 +2 days 🔍
09/17/2021 +0 days 🔍
06/19/2026 +1736 days 🔍

Sourcesinfo

Advisory: 9894c1d2010870c351f66c6f6efcf656e26bb726
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-3803 (🔍)
GCVE (CVE): GCVE-0-2021-3803
GCVE (VulDB): GCVE-100-182852
CERT Bund: WID-SEC-2026-1955 - Atlassian Bamboo, Bitbucket, Confluence, Fisheye, Crucible, Jira und Jira Service Management: Mehrere Schwachstellen

Entryinfo

Created: 09/17/2021 12:52
Updated: 06/19/2026 09:45
Changes: 09/17/2021 12:52 (48), 09/22/2021 13:54 (2), 06/19/2026 09:45 (25)
Complete: 🔍
Cache ID: 216::103