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Vulnerability details: VCID-4dx6-52mp-aaae
Vulnerability ID VCID-4dx6-52mp-aaae
Aliases CVE-2016-4979
Summary The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the "SSLVerifyClient require" directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.
Status Published
Exploitability 0.5
Weighted Severity 8.2
Risk 4.1
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-284 Improper Access Control
CWE-287 Improper Authentication
System Score Found at
generic_textual Medium http://httpd.apache.org/security/vulnerabilities_24.html
cvssv3 9.1 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-4979.json
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00211 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00282 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00282 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00282 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.00282 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.40641 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.40641 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.40641 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.40641 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.40641 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.44542 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
epss 0.51078 https://api.first.org/data/v1/epss?cve=CVE-2016-4979
rhbs medium https://bugzilla.redhat.com/show_bug.cgi?id=1352476
cvssv2 7.8 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
apache_httpd important https://httpd.apache.org/security/json/CVE-2016-4979.json
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2016-4979
cvssv3 7.5 https://nvd.nist.gov/vuln/detail/CVE-2016-4979
cvssv3.1 8.1 http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
generic_textual HIGH http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
Reference id Reference type URL
http://httpd.apache.org/security/vulnerabilities_24.html
http://packetstormsecurity.com/files/137771/Apache-2.4.20-X509-Authentication-Bypass.html
https://access.redhat.com/errata/RHSA-2016:1420
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-4979.json
https://api.first.org/data/v1/epss?cve=CVE-2016-4979
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4979
http://seclists.org/fulldisclosure/2016/Jul/11
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/apache/httpd/commit/2d0e4eff04ea963128a41faaef21f987272e05a2
https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r76142b8c5119df2178be7c2dba88fde552eedeec37ea993dfce68d1d%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9@%3Ccvs.httpd.apache.org%3E
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E
https://security.gentoo.org/glsa/201610-02
https://security.netapp.com/advisory/ntap-20180601-0001/
http://www.apache.org/dist/httpd/CHANGES_2.4
http://www.openwall.com/lists/oss-security/2016/07/05/5
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html
http://www.securityfocus.com/bid/91566
http://www.securitytracker.com/id/1036225
1352476 https://bugzilla.redhat.com/show_bug.cgi?id=1352476
cpe:2.3:a:apache:http_server:2.4.18:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.4.18:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.19:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.4.19:*:*:*:*:*:*:*
cpe:2.3:a:apache:http_server:2.4.20:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:apache:http_server:2.4.20:*:*:*:*:*:*:*
CVE-2016-4979 https://httpd.apache.org/security/json/CVE-2016-4979.json
CVE-2016-4979 https://nvd.nist.gov/vuln/detail/CVE-2016-4979
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2016-4979.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: AV:N/AC:L/Au:N/C:C/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2016-4979
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2016-4979
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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H Found at http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
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 0.59434
EPSS Score 0.00211
Published At Nov. 1, 2024, midnight
Date Actor Action Source VulnerableCode Version
There are no relevant records.