CVE-2016-4975
mod_userdir CRLF injection
At a glance
- Severity
- Not available
- EPSS
- EPSS 19.80 % · percentile 97 (2026-10-27)
- State
- PUBLISHED
- Published
- Updated
- Assigner
- apache
- NVD status
- Modified
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).
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.0 | MEDIUM 6.1 | CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N | NVD · nvd@nist.gov (Primary) |
| CVSS 2.0 | MEDIUM 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N | NVD · nvd@nist.gov (Primary) |
Weaknesses (CWE)
European references
- ENISA EUVD · EUVD-2016-5946
- GCVE · GCVE-0-2016-4975
Affected configurations (NVD CPE)
cpe:2.3:a:apache:http_server:2.2.0:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.2:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.3:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.4:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.6:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.8:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.9:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.10:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.11:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.12:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.13:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.14:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.15:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.16:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.17:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.18:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.19:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.20:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.21:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.22:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.23:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.24:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.25:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.26:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.27:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.29:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.2.31:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.1:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.2:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.3:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.4:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.6:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.7:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.9:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.10:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.12:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.16:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.17:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.18:*:*:*:*:*:*:*cpe:2.3:a:apache:http_server:2.4.20:*:*:*:*:*:*:*- +1 more
Affected products
| Product | Versions |
|---|---|
| Apache Software Foundation · Apache HTTP Server | affected Fixed in Apache HTTP Server 2.4.25 (Affected 2.4.1-2.4.23) ; affected Fixed in Apache HTTP Server 2.2.32 (Affected 2.2.0-2.2.31) |
References
- https://httpd.apache.org/security/vulnerabilities_22.html#CVE-2016-4975
- https://security.netapp.com/advisory/ntap-20180926-0006/
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03908en_us
- http://www.securityfocus.com/bid/105093
- https://httpd.apache.org/security/vulnerabilities_24.html#CVE-2016-4975
- https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/rd336919f655b7ff309385e34a143e41c503e133da80414485b3abcc9%40%3Ccvs.httpd.apache.org%3E
- https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |