← Global Threat Landscape
CVE-2021-40438
CWE-918
Critical
99.0
RPSRPS range: 0–105; KEV-listed vulnerabilities can receive an exploitation amplifier.
Description
A crafted request uri-path can cause mod_proxy to forward the request to an origin server choosen by the remote user. This issue affects Apache HTTP Server 2.4.48 and earlier.
Source: NVD
Signals
- CVSS
- 9.0
- Critical · v3.1
- EPSS
- 99.99%
- Probability of exploitation in the next 30 days (FIRST)
- CISA KEV
- In CISA KEV since Dec 2021
- Fix commit
- Fix commit known
- Sources: MoreFixes, FreshFixes
- Weakness
- CWE-918
- Published
- 16 Sept 2021
- Last modified 6 Aug 2026
How to read these signals: RPS · EPSS · CISA KEV · Data sources
Get this score from the API
curl -H "Authorization: Bearer dsec_live_xxxxxxxx" \
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Data as of 7 Oct 2026, 05:16 UK time