Advisory details:
vulnrichment / CVE-2021-40438
| Advisory ID | vulnrichment/CVE-2021-40438 |
| Aliases | |
| Summary | 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. |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 0.0 |
| Risk | |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 9 | |
| ssvc | Act |
| Data source | KEV |
|---|---|
| Date added | Dec. 1, 2021 |
| 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. |
| Required action | Apply updates per vendor instructions. |
| Due date | Dec. 15, 2021 |
| Note | https://nvd.nist.gov/vuln/detail/CVE-2021-40438 |
| Ransomware campaign use | Known |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:A/A:Y/T:T/P:M/B:A/M:M/D:C/2026-08-05T20:03:20Z/
Decision: Act
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2021/40xxx/CVE-2021-40438.json
Source Advisory: vulnrichment/CVE-2021-40438
[{'Exploitation': 'active'},
{'Automatable': 'yes'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]