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: 38799646-2460-4afe-b5b9-a92164d0fe1d
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 12:28 UTC
| Updated: 2026-02-06 07:17 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 64701c03-2a8d-498c-bde5-c33adbd62722
Exploited: Yes
Characteristics
Severity:
90.0
Timestamps
First Seen: 2023-10-14
Asserted: 2023-10-14
Last Seen: 2026-07-20
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 2026-07-20: 58
Evidence
Type: Honeypot
Signal: In The Wild Attempts
Confidence: 70%
Source: shadowserver
Details
| 1D | 1 |
|---|---|
| Iot | no |
| Feed | Shadowserver Foundation honeypot/exploited-vulnerabilities |
| Type | http-scan |
| Class | web-server |
| 7D Avg | 1 |
| Vendor | Apache |
| 30D Avg | 1 |
| 90D Avg | 2 |
| Product | Apache HTTP Server |
| Cisa Kev | yes |
| Connections | 58 |
| Observation Date | 2026-07-20 |
| Vulnerability Class | CVSS |
| Vulnerability Score | 9 |
| Vulnerability Severity | Critical |
References
Created: 2026-06-30 09:23 UTC
| Updated: 2026-07-22 01:00 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 72346d81-450a-485b-9228-f48146f22c39
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 14:04 UTC
| Updated: 2026-07-10 06:14 UTC
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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.
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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.
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