Vulnerability in Apache HTTP Server
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).
Vulnerability class: CRLF Injection
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.198 (97.3th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 97.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.198 · newest: 0.198 · change: 0.000
Affected products
- Apache HTTP Server — versions 2.2.0, 2.2.2, 2.2.3
- Apache Software Foundation HTTP Server — versions 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)
Weakness classification (CWE)
Public proof-of-concept exploits
References
- httpd.apache.org/security/vulnerabilities_22.html (Vendor Advisory)
- security.netapp.com/advisory/ntap-20180926-0006/ (Third Party Advisory)
- support.hpe.com/hpsc/doc/public/display
- www.securityfocus.com/bid/105093 (VDB Entry, Third Party Advisory, vdb-entry)
- httpd.apache.org/security/vulnerabilities_24.html (Vendor Advisory)
- lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd6… (mailing-list)
- lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209… (mailing-list)
- lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863b… (mailing-list)
- lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951… (mailing-list)
- lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a… (mailing-list)
Frequently asked questions
- What is CVE-2016-4975?
- CVE-2016-4975 is a medium-severity vulnerability in Apache HTTP Server, classified under CRLF Injection. CVSS score: 6.1/10. Published 2018-08-14.
- How severe is CVE-2016-4975?
- Medium severity. CVSS v3 base score is 6.1 out of 10.
- Is CVE-2016-4975 known to be exploited?
- 32 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.