ModSecurity up to 2.9.4/3.0.5 JSON Object denial of service

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 (≈)
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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-$5k0.00

Summaryinfo

A vulnerability identified as problematic has been detected in ModSecurity up to 2.9.4/3.0.5. Impacted is an unknown function of the component JSON Object Handler. Performing a manipulation results in denial of service. This vulnerability is known as CVE-2021-42717. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in ModSecurity up to 2.9.4/3.0.5. It has been classified as problematic. This affects some unknown functionality of the component JSON Object Handler. The manipulation with an unknown input leads to a denial of service vulnerability. CWE is classifying the issue as CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. This is going to have an impact on availability.

The weakness was published 12/08/2021. The advisory is shared at trustwave.com. This vulnerability is uniquely identified as CVE-2021-42717 since 10/19/2021. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Name

Version

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: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: 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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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

10/19/2021 🔍
12/08/2021 +50 days 🔍
12/08/2021 +0 days 🔍
07/04/2025 +1303 days 🔍

Sourcesinfo

Advisory: trustwave.com
Status: Not defined

CVE: CVE-2021-42717 (🔍)
GCVE (CVE): GCVE-0-2021-42717
GCVE (VulDB): GCVE-100-187665
scip Labs: https://www.scip.ch/en/?labs.20130913

Entryinfo

Created: 12/08/2021 01:56
Updated: 07/04/2025 01:12
Changes: 12/08/2021 01:56 (36), 12/10/2021 14:35 (1), 07/04/2025 01:12 (33)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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