Vulnerability Details : CVE-2021-33193
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.
Products affected by CVE-2021-33193
- cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:secure_backup:*:*:*:*:*:*:*:*
- cpe:2.3:a:oracle:zfs_storage_appliance_kit:8.8:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:*
Threat overview for CVE-2021-33193
Top countries where our scanners detected CVE-2021-33193
Top open port discovered on systems with this issue
80
IPs affected by CVE-2021-33193 5,186,871
Threat actors abusing to this issue?
Yes
Find out if you* are
affected by CVE-2021-33193!
*Directly or indirectly through your vendors, service providers and 3rd parties.
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attack surface intelligence
from SecurityScorecard.
Exploit prediction scoring system (EPSS) score for CVE-2021-33193
0.13%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 46 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-33193
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.0
|
MEDIUM | AV:N/AC:L/Au:N/C:N/I:P/A:N |
10.0
|
2.9
|
NIST | |
|
7.5
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N |
3.9
|
3.6
|
NIST |
References for CVE-2021-33193
-
https://lists.debian.org/debian-lts-announce/2023/03/msg00002.html
[SECURITY] [DLA 3351-1] apache2 security update
-
https://www.oracle.com/security-alerts/cpuapr2022.html
Oracle Critical Patch Update Advisory - April 2022Patch;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DSM6UWQICBJ2TU727RENU3HBKEAFLT6T/
[SECURITY] Fedora 34 Update: httpd-2.4.50-1.fc34 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://www.oracle.com/security-alerts/cpujan2022.html
Oracle Critical Patch Update Advisory - January 2022Patch;Third Party Advisory
-
https://lists.apache.org/thread.html/ree7519d71415ecdd170ff1889cab552d71758d2ba2904a17ded21a70@%3Ccvs.httpd.apache.org%3E
[httpd-site] branch main updated: Add descriptions for CVE-2021-33193 CVE-2021-36160 - Pony MailMailing List;Patch;Vendor Advisory
-
https://security.gentoo.org/glsa/202208-20
Apache HTTPD: Multiple Vulnerabilities (GLSA 202208-20) — Gentoo securityThird Party Advisory
-
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-apache-httpd-2.4.49-VWL69sWQ
Multiple Vulnerabilities in Apache HTTP Server Affecting Cisco Products: November 2021Third Party Advisory
-
https://portswigger.net/research/http2
HTTP/2: The Sequel is Always Worse | PortSwigger ResearchExploit;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EUVJVRJRBW5QVX4OY3NOHZDQ3B3YOTSG/
[SECURITY] Fedora 35 Update: httpd-2.4.50-1.fc35 - package-announce - Fedora Mailing-ListsMailing List;Third Party Advisory
-
https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch
Patch;Third Party Advisory
-
https://lists.apache.org/thread.html/re4162adc051c1a0a79e7a24093f3776373e8733abaff57253fef341d@%3Ccvs.httpd.apache.org%3E
Pony Mail!Mailing List;Patch;Vendor Advisory
-
https://www.tenable.com/security/tns-2021-17
[R1] Stand-alone Security Patch Available for Tenable.sc versions 5.16.0 to 5.19.1: Patch 202110.1 - Security Advisory | Tenable®Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20210917-0004/
CVE-2021-33193 Apache HTTP Server Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
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