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Vulnerability details: VCID-8gcm-7q3n-q7bm
Vulnerability ID VCID-8gcm-7q3n-q7bm
Aliases CVE-2016-4975
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 4.8
Risk 2.4
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
System Score Found at
cvssv3 3.7 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-4975.json
epss 0.73272 https://api.first.org/data/v1/epss?cve=CVE-2016-4975
epss 0.73272 https://api.first.org/data/v1/epss?cve=CVE-2016-4975
epss 0.73272 https://api.first.org/data/v1/epss?cve=CVE-2016-4975
epss 0.73272 https://api.first.org/data/v1/epss?cve=CVE-2016-4975
epss 0.73272 https://api.first.org/data/v1/epss?cve=CVE-2016-4975
epss 0.75341 https://api.first.org/data/v1/epss?cve=CVE-2016-4975
epss 0.75341 https://api.first.org/data/v1/epss?cve=CVE-2016-4975
epss 0.75341 https://api.first.org/data/v1/epss?cve=CVE-2016-4975
cvssv3 3.9 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
apache_httpd moderate https://httpd.apache.org/security/json/CVE-2016-4975.json
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-4975.json
https://api.first.org/data/v1/epss?cve=CVE-2016-4975
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4975
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
1375968 https://bugzilla.redhat.com/show_bug.cgi?id=1375968
CVE-2016-4975 https://httpd.apache.org/security/json/CVE-2016-4975.json
RHSA-2017:0906 https://access.redhat.com/errata/RHSA-2017:0906
RHSA-2018:2185 https://access.redhat.com/errata/RHSA-2018:2185
RHSA-2018:2186 https://access.redhat.com/errata/RHSA-2018:2186
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-4975.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.98788
EPSS Score 0.73272
Published At April 9, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:36:20.169902+00:00 Apache HTTPD Importer Import https://httpd.apache.org/security/json/CVE-2016-4975.json 38.0.0