Logo
-

Byte Open Security

(ByteOS Network)

Log In

Sign Up

ByteOS

Security
Vulnerability Details
Registries
Custom Views
Weaknesses
Attack Patterns
Filters & Tools
Vulnerability Details :

CVE-2021-33193

Summary
Assigner-apache
Assigner Org ID-f0158376-9dc2-43b6-827c-5f631a4d8d09
Published At-16 Aug, 2021 | 00:00
Updated At-03 Aug, 2024 | 23:42
Rejected At-
Credits

Request splitting via HTTP/2 method injection and mod_proxy

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:apache
Assigner Org ID:f0158376-9dc2-43b6-827c-5f631a4d8d09
Published At:16 Aug, 2021 | 00:00
Updated At:03 Aug, 2024 | 23:42
Rejected At:
▼CVE Numbering Authority (CNA)
Request splitting via HTTP/2 method injection and mod_proxy

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

Affected Products
Vendor
The Apache Software FoundationApache Software Foundation
Product
Apache HTTP Server
Versions
Affected
  • Apache HTTP Server 2.4 2.4.17 to 2.4.48
Problem Types
TypeCWE IDDescription
textN/ARequest Splitting
Type: text
CWE ID: N/A
Description: Request Splitting
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
unknown
other:
moderate
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Reported by James Kettle of PortSwigger
Timeline
EventDate
reported2021-05-11 00:00:00
public2021-08-06 00:00:00
Event: reported
Date: 2021-05-11 00:00:00
Event: public
Date: 2021-08-06 00:00:00
Replaced By

Rejected Reason

References
HyperlinkResource
https://portswigger.net/research/http2
N/A
https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch
N/A
https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E
mailing-list
https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E
mailing-list
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
vendor-advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
vendor-advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
vendor-advisory
https://www.oracle.com/security-alerts/cpujan2022.html
N/A
https://security.netapp.com/advisory/ntap-20210917-0004/
N/A
https://www.tenable.com/security/tns-2021-17
N/A
https://www.oracle.com/security-alerts/cpuapr2022.html
N/A
https://security.gentoo.org/glsa/202208-20
vendor-advisory
https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html
mailing-list
Hyperlink: https://portswigger.net/research/http2
Resource: N/A
Hyperlink: https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch
Resource: N/A
Hyperlink: https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E
Resource:
mailing-list
Hyperlink: https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E
Resource:
mailing-list
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
Resource:
vendor-advisory
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
Resource:
vendor-advisory
Hyperlink: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
Resource:
vendor-advisory
Hyperlink: https://www.oracle.com/security-alerts/cpujan2022.html
Resource: N/A
Hyperlink: https://security.netapp.com/advisory/ntap-20210917-0004/
Resource: N/A
Hyperlink: https://www.tenable.com/security/tns-2021-17
Resource: N/A
Hyperlink: https://www.oracle.com/security-alerts/cpuapr2022.html
Resource: N/A
Hyperlink: https://security.gentoo.org/glsa/202208-20
Resource:
vendor-advisory
Hyperlink: https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html
Resource:
mailing-list
▼Authorized Data Publishers (ADP)
CVE Program Container
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://portswigger.net/research/http2
x_transferred
https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch
x_transferred
https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E
mailing-list
x_transferred
https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E
mailing-list
x_transferred
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
vendor-advisory
x_transferred
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
vendor-advisory
x_transferred
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
vendor-advisory
x_transferred
https://www.oracle.com/security-alerts/cpujan2022.html
x_transferred
https://security.netapp.com/advisory/ntap-20210917-0004/
x_transferred
https://www.tenable.com/security/tns-2021-17
x_transferred
https://www.oracle.com/security-alerts/cpuapr2022.html
x_transferred
https://security.gentoo.org/glsa/202208-20
vendor-advisory
x_transferred
https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html
mailing-list
x_transferred
Hyperlink: https://portswigger.net/research/http2
Resource:
x_transferred
Hyperlink: https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch
Resource:
x_transferred
Hyperlink: https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E
Resource:
mailing-list
x_transferred
Hyperlink: https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E
Resource:
mailing-list
x_transferred
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
Resource:
vendor-advisory
x_transferred
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
Resource:
vendor-advisory
x_transferred
Hyperlink: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
Resource:
vendor-advisory
x_transferred
Hyperlink: https://www.oracle.com/security-alerts/cpujan2022.html
Resource:
x_transferred
Hyperlink: https://security.netapp.com/advisory/ntap-20210917-0004/
Resource:
x_transferred
Hyperlink: https://www.tenable.com/security/tns-2021-17
Resource:
x_transferred
Hyperlink: https://www.oracle.com/security-alerts/cpuapr2022.html
Resource:
x_transferred
Hyperlink: https://security.gentoo.org/glsa/202208-20
Resource:
vendor-advisory
x_transferred
Hyperlink: https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html
Resource:
mailing-list
x_transferred
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security@apache.org
Published At:16 Aug, 2021 | 08:15
Updated At:01 May, 2025 | 15:40

A crafted method sent through HTTP/2 will bypass validation and be forwarded by mod_proxy, which can lead to request splitting or cache poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Primary3.17.5HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Primary2.05.0MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N
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:H/A:N
Type: Primary
Version: 2.0
Base score: 5.0
Base severity: MEDIUM
Vector:
AV:N/AC:L/Au:N/C:N/I:P/A:N
CPE Matches

Debian GNU/Linux
debian
>>debian_linux>>10.0
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
The Apache Software Foundation
apache
>>http_server>>Versions from 2.4.17(inclusive) to 2.4.49(exclusive)
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
Fedora Project
fedoraproject
>>fedora>>34
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
Fedora Project
fedoraproject
>>fedora>>35
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Tenable, Inc.
tenable
>>tenable.sc>>Versions up to 5.19.1(inclusive)
cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*
Oracle Corporation
oracle
>>secure_backup>>Versions before 18.1.0.1.0(exclusive)
cpe:2.3:a:oracle:secure_backup:*:*:*:*:*:*:*:*
Oracle Corporation
oracle
>>zfs_storage_appliance_kit>>8.8
cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
NVD-CWE-OtherPrimarynvd@nist.gov
CWE ID: NVD-CWE-Other
Type: Primary
Source: nvd@nist.gov
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patchsecurity@apache.org
Patch
https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3Esecurity@apache.org
Patch
https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3Esecurity@apache.org
Patch
https://lists.debian.org/debian-lts-announce/2023/03/msg00002.htmlsecurity@apache.org
Mailing List
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/security@apache.org
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/security@apache.org
Third Party Advisory
https://portswigger.net/research/http2security@apache.org
Exploit
Third Party Advisory
https://security.gentoo.org/glsa/202208-20security@apache.org
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210917-0004/security@apache.org
Third Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQsecurity@apache.org
Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlsecurity@apache.org
Patch
Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.htmlsecurity@apache.org
Patch
Third Party Advisory
https://www.tenable.com/security/tns-2021-17security@apache.org
Third Party Advisory
https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patchaf854a3a-2127-422b-91ae-364da2661108
Patch
https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3Eaf854a3a-2127-422b-91ae-364da2661108
Patch
https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3Eaf854a3a-2127-422b-91ae-364da2661108
Patch
https://lists.debian.org/debian-lts-announce/2023/03/msg00002.htmlaf854a3a-2127-422b-91ae-364da2661108
Mailing List
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://portswigger.net/research/http2af854a3a-2127-422b-91ae-364da2661108
Exploit
Third Party Advisory
https://security.gentoo.org/glsa/202208-20af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://security.netapp.com/advisory/ntap-20210917-0004/af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQaf854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
https://www.oracle.com/security-alerts/cpuapr2022.htmlaf854a3a-2127-422b-91ae-364da2661108
Patch
Third Party Advisory
https://www.oracle.com/security-alerts/cpujan2022.htmlaf854a3a-2127-422b-91ae-364da2661108
Patch
Third Party Advisory
https://www.tenable.com/security/tns-2021-17af854a3a-2127-422b-91ae-364da2661108
Third Party Advisory
Hyperlink: https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch
Source: security@apache.org
Resource:
Patch
Hyperlink: https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E
Source: security@apache.org
Resource:
Patch
Hyperlink: https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E
Source: security@apache.org
Resource:
Patch
Hyperlink: https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html
Source: security@apache.org
Resource:
Mailing List
Third Party Advisory
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
Source: security@apache.org
Resource:
Third Party Advisory
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
Source: security@apache.org
Resource:
Third Party Advisory
Hyperlink: https://portswigger.net/research/http2
Source: security@apache.org
Resource:
Exploit
Third Party Advisory
Hyperlink: https://security.gentoo.org/glsa/202208-20
Source: security@apache.org
Resource:
Third Party Advisory
Hyperlink: https://security.netapp.com/advisory/ntap-20210917-0004/
Source: security@apache.org
Resource:
Third Party Advisory
Hyperlink: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
Source: security@apache.org
Resource:
Third Party Advisory
Hyperlink: https://www.oracle.com/security-alerts/cpuapr2022.html
Source: security@apache.org
Resource:
Patch
Third Party Advisory
Hyperlink: https://www.oracle.com/security-alerts/cpujan2022.html
Source: security@apache.org
Resource:
Patch
Third Party Advisory
Hyperlink: https://www.tenable.com/security/tns-2021-17
Source: security@apache.org
Resource:
Third Party Advisory
Hyperlink: https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Patch
Hyperlink: https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Patch
Hyperlink: https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70%40%3Ccvs.httpd.apache.org%3E
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Patch
Hyperlink: https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Mailing List
Third Party Advisory
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory
Hyperlink: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory
Hyperlink: https://portswigger.net/research/http2
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Exploit
Third Party Advisory
Hyperlink: https://security.gentoo.org/glsa/202208-20
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory
Hyperlink: https://security.netapp.com/advisory/ntap-20210917-0004/
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory
Hyperlink: https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
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.oracle.com/security-alerts/cpujan2022.html
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Patch
Third Party Advisory
Hyperlink: https://www.tenable.com/security/tns-2021-17
Source: af854a3a-2127-422b-91ae-364da2661108
Resource:
Third Party Advisory

Change History

0
Information is not available yet

Similar CVEs

0Records found

Details not found