CVE-2016-4979

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Summary

CVECVE-2016-4979
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-07-06 14:59:04 UTC
Updated2026-05-06 22:30:45 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.0 7.5 HIGH from [email protected]

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Problem Types: CWE-284 | n/a

VersionSourceTypeScoreSeverityVector
3.0[email protected]Primary7.5HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
2.0[email protected]Primary5AV:N/AC:L/Au:N/C:N/I:P/A:N

CVSS v3.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None

AV:N/AC:L/Au:N/C:N/I:P/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Apache Http Server 2.4.18 All All All
Application Apache Http Server 2.4.19 All All All
Application Apache Http Server 2.4.20 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
August 2016 Apache HTTP Server Vulnerabilities in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
Full Disclosure: CVE-2016-4979: HTTPD webserver - X509 Client certificate based authentication can be bypassed when HTTP/2 is used [vs] af854a3a-2127-422b-91ae-364da2661108 seclists.org
modssl: reset client-verify state when renegotiation is aborted · apache/httpd@2d0e4ef · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com
Apache HTTPD HTTP/2 Certificate Validation Flaw Lets Remote Users Bypass Client Certificate Authentication on the Target System - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Oracle Critical Patch Update - October 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Oracle Solaris Bulletin - October 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com
www.apache.org/dist/httpd/CHANGES_2.4 af854a3a-2127-422b-91ae-364da2661108 www.apache.org
oss-security - CVE-2016-4979: HTTPD webserver - X509 Client certificate based authentication can be bypassed when HTTP/2 is used [vs] af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Apache HTTP Server 2.4 vulnerabilities - The Apache HTTP Server Project af854a3a-2127-422b-91ae-364da2661108 httpd.apache.org Patch, Vendor Advisory
Apache HTTP Server CVE-2016-4979 Authentication Bypass Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
Red Hat Customer Portal af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Apache 2.4.20 X509 Authentication Bypass ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Pony Mail! af854a3a-2127-422b-91ae-364da2661108 lists.apache.org
Apache: Multiple vulnerabilities (GLSA 201610-02) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org
Pony Mail! MITRE lists.apache.org
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