CVE-2021-40438 (GCVE-0-2021-40438)
Vulnerability from cvelistv5 – Published: 2021-09-16 14:40 – Updated: 2026-08-06 03:55Title
mod_proxy SSRF
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.
Severity
9 (Critical)
SSVC
Exploitation: active
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2021-10-14 00:00 UTC
CWE
- CWE-918 - Server Side Request Forgery (SSRF)
Assigner
References
20 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Apache Software Foundation | Apache HTTP Server |
Affected:
Apache HTTP Server 2.4 , ≤ 2.4.48
(custom)
|
guessed |
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 95af384b-7aba-4d32-b24f-c51a8b507e7c
Exploited: Yes
Timestamps
First Seen: 2021-12-01
Asserted: 2021-12-01
Scope
Notes: KEV entry: Apache HTTP Server-Side Request Forgery (SSRF) | Affected: Apache / Apache | 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: 2021-12-15 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://nvd.nist.gov/vuln/detail/CVE-2021-40438
Evidence
Type: Vendor Report
Signal: Successful Exploitation
Confidence: 80%
Source: cisa-kev
Details
| Cwes | CWE-918 |
|---|---|
| Feed | CISA Known Exploited Vulnerabilities Catalog |
| Product | Apache |
| Due Date | 2021-12-15 |
| Date Added | 2021-12-01 |
| Vendorproject | Apache |
| Vulnerabilityname | Apache HTTP Server-Side Request Forgery (SSRF) |
| Knownransomwarecampaignuse | Unknown |
References
Created: 2026-02-02 13:26 UTC
| Updated: 2026-02-06 07:53 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 830d0342-b044-4e8f-9ca0-55ee097201fe
Exploited: Yes
Characteristics
Severity:
90.0
Timestamps
First Seen: 2023-10-14
Asserted: 2023-10-14
Last Seen: 2026-10-23
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Apache / Apache HTTP Server | Class: web-server | Severity: Critical (CVSS 9) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-10-23: 33
Evidence
Type: Honeypot
Signal: In The Wild Attempts
Confidence: 70%
Source: shadowserver
Details
| 1D | 5 |
|---|---|
| Iot | no |
| Feed | Shadowserver Foundation honeypot/exploited-vulnerabilities |
| Type | http-scan |
| Class | web-server |
| 7D Avg | 4 |
| Vendor | Apache |
| 30D Avg | 9 |
| 90D Avg | 5 |
| Product | Apache HTTP Server |
| Cisa Kev | yes |
| Connections | 33 |
| Observation Date | 2026-10-23 |
| Vulnerability Class | CVSS |
| Vulnerability Score | 9 |
| Vulnerability Severity | Critical |
References
Created: 2026-07-01 05:53 UTC
| Updated: 2026-10-25 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 8f552444-6f2a-45f9-9d84-94f60fbb8aa9
Exploited: Yes
Timestamps
First Seen: 2021-12-01
Asserted: 2021-12-01
Scope
Notes: KEVIntel entry: mod_proxy SSRF | Affected: Apache Software Foundation / Apache HTTP Server | CVSS: 9.0 (CRITICAL) | EPSS: 0.99999 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence
Type: Public Report
Signal: Successful Exploitation
Confidence: 70%
Source: kevintel
Details
| Feed | KEVIntel (kevintel.com) |
|---|---|
| Title | mod_proxy SSRF |
| Vendor | Apache Software Foundation |
| Product | Apache HTTP Server |
| Added Date | 2021-12-01T00:00:00.000Z |
| Cvss Score | 9.0 |
| Epss Score | 0.99999 |
| Cvss Severity | CRITICAL |
| Epss Percentile | 0.99997 |
| Used In Malware | unknown |
| Ahead Of Cisa Kev | None |
| Not Yet In Cisa Kev | False |
References
Created: 2026-06-23 11:13 UTC
| Updated: 2026-06-23 11:13 UTC
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.