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Vulnerability Details :

CVE-2021-42717

Assigner-mitre

Assigner Org ID-8254265b-2729-46b6-b9e3-3dfca2d5bfca

Published At-07 Dec, 2021 | 21:08

Updated At-04 Aug, 2024 | 03:38

ModSecurity 3.x through 3.0.5 mishandles excessively nested JSON objects. Crafted JSON objects with nesting tens-of-thousands deep could result in the web server being unable to service legitimate requests. Even a moderately large (e.g., 300KB) HTTP request can occupy one of the limited NGINX worker processes for minutes and consume almost all of the available CPU on the machine. Modsecurity 2 is similarly vulnerable: the affected versions include 2.8.0 through 2.9.4.

EPSS History

Score

Latest Score

N/A

Percentile

Latest Percentile

N/A

▼Common Vulnerabilities and Exposures (CVE)

cve.org

Assigner:mitre

Assigner Org ID:8254265b-2729-46b6-b9e3-3dfca2d5bfca

Published At:07 Dec, 2021 | 21:08

Updated At:04 Aug, 2024 | 03:38

▼CVE Numbering Authority (CNA)

Affected Products

Vendor

n/a

Product

n/a

Versions

Affected

Problem Types

Type	CWE ID	Description
text	N/A	n/a

Type: text

CWE ID: N/A

Description: n/a

References

Hyperlink	Resource
https://www.debian.org/security/2021/dsa-5023	vendor-advisory x_refsource_DEBIAN
https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC
https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/	x_refsource_MISC
https://lists.debian.org/debian-lts-announce/2022/05/msg00042.html	mailing-list x_refsource_MLIST

Hyperlink: https://www.debian.org/security/2021/dsa-5023

Resource:

vendor-advisory

x_refsource_DEBIAN

Hyperlink: https://www.oracle.com/security-alerts/cpuapr2022.html

Resource:

x_refsource_MISC

Hyperlink: https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/

Resource:

x_refsource_MISC

Hyperlink: https://lists.debian.org/debian-lts-announce/2022/05/msg00042.html

Resource:

mailing-list

x_refsource_MLIST

▼Authorized Data Publishers (ADP)

CVE Program Container

References

Hyperlink	Resource
https://www.debian.org/security/2021/dsa-5023	vendor-advisory x_refsource_DEBIAN x_transferred
https://www.oracle.com/security-alerts/cpuapr2022.html	x_refsource_MISC x_transferred
https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/	x_refsource_MISC x_transferred
https://lists.debian.org/debian-lts-announce/2022/05/msg00042.html	mailing-list x_refsource_MLIST x_transferred

Hyperlink: https://www.debian.org/security/2021/dsa-5023

Resource:

vendor-advisory

x_refsource_DEBIAN

x_transferred

Hyperlink: https://www.oracle.com/security-alerts/cpuapr2022.html

Resource:

x_refsource_MISC

x_transferred

Hyperlink: https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/

Resource:

x_refsource_MISC

x_transferred

Hyperlink: https://lists.debian.org/debian-lts-announce/2022/05/msg00042.html

Resource:

mailing-list

x_refsource_MLIST

x_transferred

▼National Vulnerability Database (NVD)

nvd.nist.gov

Source:cve@mitre.org

Published At:07 Dec, 2021 | 22:15

Updated At:03 Jul, 2025 | 20:59

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Primary	3.1	7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary	2.0	5.0	MEDIUM	AV:N/AC:L/Au:N/C:N/I:N/A:P

Type: Primary

Version: 3.1

Base score: 7.5

Base severity: HIGH

Vector:

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Type: Primary

Version: 2.0

Base score: 5.0

Base severity: MEDIUM

Vector:

AV:N/AC:L/Au:N/C:N/I:N/A:P

CPE Matches

owasp>>modsecurity>>Versions from 3.0.0(inclusive) to 3.0.6(exclusive)

cpe:2.3:a:owasp:modsecurity:*:*:*:*:*:*:*:*

trustwave>>modsecurity>>Versions from 2.0.0(inclusive) to 2.9.5(exclusive)

cpe:2.3:a:trustwave:modsecurity:*:*:*:*:*:*:*:*

F5, Inc.

>>nginx_modsecurity_waf>>r24

cpe:2.3:a:f5:nginx_modsecurity_waf:r24:*:*:*:*:*:*:*

F5, Inc.

>>nginx_modsecurity_waf>>r25

cpe:2.3:a:f5:nginx_modsecurity_waf:r25:*:*:*:*:*:*:*

Debian GNU/Linux

>>debian_linux>>9.0

cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

Debian GNU/Linux

>>debian_linux>>10.0

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Debian GNU/Linux

>>debian_linux>>11.0

cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

Oracle Corporation

>>http_server>>12.2.1.3.0

cpe:2.3:a:oracle:http_server:12.2.1.3.0:*:*:*:*:*:*:*

Oracle Corporation

>>http_server>>12.2.1.4.0

cpe:2.3:a:oracle:http_server:12.2.1.4.0:*:*:*:*:*:*:*

Oracle Corporation

>>zfs_storage_appliance_kit>>8.8

cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*

Weaknesses

CWE ID	Type	Source
CWE-674	Primary	nvd@nist.gov

CWE ID: CWE-674

Type: Primary

Source: nvd@nist.gov

References

Hyperlink	Source	Resource
https://lists.debian.org/debian-lts-announce/2022/05/msg00042.html	cve@mitre.org	Mailing List Third Party Advisory
https://www.debian.org/security/2021/dsa-5023	cve@mitre.org	Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	cve@mitre.org	Patch Third Party Advisory
https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/	cve@mitre.org	Exploit Mitigation Vendor Advisory
https://lists.debian.org/debian-lts-announce/2022/05/msg00042.html	af854a3a-2127-422b-91ae-364da2661108	Mailing List Third Party Advisory
https://www.debian.org/security/2021/dsa-5023	af854a3a-2127-422b-91ae-364da2661108	Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.html	af854a3a-2127-422b-91ae-364da2661108	Patch Third Party Advisory
https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/	af854a3a-2127-422b-91ae-364da2661108	Exploit Mitigation Vendor Advisory

Hyperlink: https://lists.debian.org/debian-lts-announce/2022/05/msg00042.html

Source: cve@mitre.org

Resource:

Mailing List

Third Party Advisory

Hyperlink: https://www.debian.org/security/2021/dsa-5023

Source: cve@mitre.org

Resource:

Third Party Advisory

Hyperlink: https://www.oracle.com/security-alerts/cpuapr2022.html

Source: cve@mitre.org

Resource:

Patch

Third Party Advisory

Hyperlink: https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/

Source: cve@mitre.org

Resource:

Exploit

Mitigation

Vendor Advisory

Hyperlink: https://lists.debian.org/debian-lts-announce/2022/05/msg00042.html

Source: af854a3a-2127-422b-91ae-364da2661108

Resource:

Mailing List

Third Party Advisory

Hyperlink: https://www.debian.org/security/2021/dsa-5023

Source: af854a3a-2127-422b-91ae-364da2661108

Resource:

Third Party Advisory

Hyperlink: https://www.oracle.com/security-alerts/cpuapr2022.html

Source: af854a3a-2127-422b-91ae-364da2661108

Resource:

Patch

Third Party Advisory

Hyperlink: https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/modsecurity-dos-vulnerability-in-json-parsing-cve-2021-42717/

Source: af854a3a-2127-422b-91ae-364da2661108

Resource:

Exploit

Mitigation

Vendor Advisory

CVE-2021-42717

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