CVE-2021-33193
HighPublic PoC
Published: 16 August 2021
Published
16 August 2021
Modified
01 May 2025
KEV Added
—
Patch
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CVSS Score v3.1
7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS Score
0.0061
70.2th percentile
Risk Priority
15
60% EPSS · 20% KEV · 20% CVSS
Summary
CVE-2021-33193 is a high-severity an unspecified weakness vulnerability in Fedoraproject Fedora. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 29.8% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2021-19907
Vulnerability details
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.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
debian
debian linux
10.0
apache
http server
2.4.17 — 2.4.49
fedoraproject
fedora
34, 35
tenable
tenable.sc
≤ 5.19.1
oracle
secure backup
≤ 18.1.0.1.0
oracle
zfs storage appliance kit
8.8
Mitigating Controls
No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.