CVE-2016-4975
UnknownEPSS 19.80%
Last modified
CVE-2016-4975 is a vulnerability of currently unknown severity. Possible CRLF injection allowing HTTP response splitting attacks for sites which use mod_userdir. This issue was mitigated by changes made in 2.4.25 and 2.2.32 which prohibit CR or LF injection into the "Location" or other outbound header key or value. EPSS estimates a 19.80% chance of exploitation in the next 30 days.
Description
Possible CRLF injection allowing HTTP response splitting attacks for sites which use mod_userdir. This issue was mitigated by changes made in 2.4.25 and 2.2.32 which prohibit CR or LF injection into the "Location" or other outbound header key or value. Fixed in Apache HTTP Server 2.4.25 (Affected 2.4.1-2.4.23). Fixed in Apache HTTP Server 2.2.32 (Affected 2.2.0-2.2.31).
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Apache | Http Server | 2.2.0 |
| Apache | Http Server | 2.2.2 |
| Apache | Http Server | 2.2.3 |
| Apache | Http Server | 2.2.4 |
| Apache | Http Server | 2.2.6 |
| Apache | Http Server | 2.2.8 |
| Apache | Http Server | 2.2.9 |
| Apache | Http Server | 2.2.10 |
| Apache | Http Server | 2.2.11 |
| Apache | Http Server | 2.2.12 |
| Apache | Http Server | 2.2.13 |
| Apache | Http Server | 2.2.14 |
| Apache | Http Server | 2.2.15 |
| Apache | Http Server | 2.2.16 |
| Apache | Http Server | 2.2.17 |
| Apache | Http Server | 2.2.18 |
| Apache | Http Server | 2.2.19 |
| Apache | Http Server | 2.2.20 |
| Apache | Http Server | 2.2.21 |
| Apache | Http Server | 2.2.22 |
| Apache | Http Server | 2.2.23 |
| Apache | Http Server | 2.2.24 |
| Apache | Http Server | 2.2.25 |
| Apache | Http Server | 2.2.26 |
| Apache | Http Server | 2.2.27 |
| Apache | Http Server | 2.2.29 |
| Apache | Http Server | 2.2.31 |
| Apache | Http Server | 2.4.1 |
| Apache | Http Server | 2.4.2 |
| Apache | Http Server | 2.4.3 |
| Apache | Http Server | 2.4.4 |
| Apache | Http Server | 2.4.6 |
| Apache | Http Server | 2.4.7 |
| Apache | Http Server | 2.4.9 |
| Apache | Http Server | 2.4.10 |
| Apache | Http Server | 2.4.12 |
| Apache | Http Server | 2.4.16 |
| Apache | Http Server | 2.4.17 |
| Apache | Http Server | 2.4.18 |
| Apache | Http Server | 2.4.20 |
| Apache | Http Server | 2.4.23 |
References
- http://www.securityfocus.com/bid/105093Third Party Advisory, VDB Entry
- https://security.netapp.com/advisory/ntap-20180926-0006/Third Party Advisory
- http://www.securityfocus.com/bid/105093Third Party Advisory, VDB Entry
- https://security.netapp.com/advisory/ntap-20180926-0006/Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2016-4975?
Possible CRLF injection allowing HTTP response splitting attacks for sites which use mod_userdir. This issue was mitigated by changes made in 2.4.25 and 2.2.32 which prohibit CR or LF injection into the "Location" or other outbound header key or value. Fixed in Apache HTTP Server 2.4.25 (Affected 2.4.1-2.4.23). Fixed in Apache HTTP Server 2.2.32 (Affected 2.2.0-2.2.31).
How severe is CVE-2016-4975?
Severity scoring for CVE-2016-4975 is pending analysis. The EPSS model estimates a 19.80% probability of exploitation in the next 30 days.
How do I fix CVE-2016-4975?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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