CVE-2021-33193
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Apache Http Server
PublishedAug 16, 2021
First seenAug 16, 2021
How to fix
Update
- apache http_server2.4.49 or later
- oracle secure_backup18.1.0.1.0 or later
Vendor advisories
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
- security.gentoo.org/glsa/202208-20
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| apache http_server | 2.4.17 ≤ v < 2.4.49 | 2.4.49 |
| debian debian_linux | 10.0 | — |
| fedoraproject fedora | 34, 35 | — |
| tenable tenable.sc | v ≤ 5.19.1 | — |
| oracle secure_backup | v < 18.1.0.1.0 | 18.1.0.1.0 |
| oracle zfs_storage_appliance_kit | 8.8 | — |
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