CVE-2021-33193high
New! CVE Severity Now Using CVSS v3
The calculated severity for CVEs has been updated to use CVSS v3 by default. CVEs that do not have a CVSS v3 score will fall back CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.
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.
References
https://portswigger.net/research/http2
https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c.patch
https://lists.apache.org/thread.html/[email protected]%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/[email protected]%3Ccvs.httpd.apache.org%3E
https://security.netapp.com/advisory/ntap-20210917-0004/
Details
Source: MITRE
Published: 2021-08-16
Updated: 2021-11-28
Type: NVD-CWE-Other
Risk Information
CVSS v2
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
CVSS v3
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH
Vulnerable Software
Configuration 1
OR
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* versions from 2.4.17 to 2.4.48 (inclusive)
Configuration 2
OR
Configuration 3
OR
cpe:2.3:a:tenable:tenable.sc:*:*:*:*:*:*:*:* versions up to 5.19.1 (inclusive)
Tenable Plugins
| ID | Name | Product | Family | Severity |
|---|---|---|---|---|
| 154240 | Tenable SecurityCenter 5.16.0 < 5.19.2 Multiple Vulnerabilities (TNS-2021-17) | Nessus | Misc. | critical |
| 154188 | Amazon Linux AMI : httpd24 (ALAS-2021-1543) | Nessus | Amazon Linux Local Security Checks | critical |
| 154179 | Amazon Linux 2 : httpd (ALAS-2021-1716) | Nessus | Amazon Linux Local Security Checks | critical |
| 154067 | SUSE SLES15 Security Update : apache2 (SUSE-SU-2021:3335-1) | Nessus | SuSE Local Security Checks | critical |
| 153939 | Photon OS 3.0: Httpd PHSA-2021-3.0-0305 | Nessus | PhotonOS Local Security Checks | high |
| 153816 | FreeBSD : Apache httpd -- multiple vulnerabilities (882a38f9-17dd-11ec-b335-d4c9ef517024) | Nessus | FreeBSD Local Security Checks | critical |
| 153768 | Ubuntu 18.04 LTS / 20.04 LTS / 21.04 : Apache HTTP Server vulnerabilities (USN-5090-1) | Nessus | Ubuntu Local Security Checks | critical |
| 153743 | Photon OS 2.0: Httpd PHSA-2021-2.0-0393 | Nessus | PhotonOS Local Security Checks | high |
| 153689 | Photon OS 1.0: Httpd PHSA-2021-1.0-0435 | Nessus | PhotonOS Local Security Checks | high |
| 153585 | Apache >= 2.4.17 < 2.4.49 mod_http2 | Nessus | Web Servers | high |
| 153456 | Slackware Linux 14.0 / 14.1 / 14.2 / current httpd Multiple Vulnerabilities (SSA:2021-259-01) | Nessus | Slackware Local Security Checks | critical |
| 112981 | Apache 2.4.x < 2.4.49 Multiple Vulnerabilities | Web Application Scanning | Component Vulnerability | critical |
| 153114 | openSUSE 15 Security Update : apache2 (openSUSE-SU-2021:1234-1) | Nessus | SuSE Local Security Checks | high |
| 153022 | SUSE SLED12 / SLES12 Security Update : apache2 (SUSE-SU-2021:2918-1) | Nessus | SuSE Local Security Checks | high |
| 152998 | openSUSE 15 Security Update : apache2 (openSUSE-SU-2021:2954-1) | Nessus | SuSE Local Security Checks | high |
| 152993 | SUSE SLED15 / SLES15 Security Update : apache2 (SUSE-SU-2021:2954-1) | Nessus | SuSE Local Security Checks | high |