CVE-2017-6413

The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka mod_auth_openidc) module before 2.1.6 for the Apache HTTP Server does not skip OIDC_CLAIM_ and OIDCAuthNHeader headers in an "AuthType oauth20" configuration, which allows remote attackers to bypass authentication via crafted HTTP traffic.

Published: 2017-03-02 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-6413 is rated High Risk (69.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 4.25%). EPSS rose +3.68% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-6413

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.58% 4.25% +3.68%
2 2026-05-26 0.41% 0.58% +0.17%
3 2025-11-21 — 0.41% —

Full EPSS history (11 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-6413

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.6 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 4.0 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-6413

OS Trackers for CVE-2017-6413

vendor priority summary link
debian not yet assigned CVE-2017-6413 not yet assigned priority: Debian including 1 source packages (libapache2-mod-auth-openidc), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-6413
redhat medium — https://access.redhat.com/security/cve/CVE-2017-6413
ubuntu medium CVE-2017-6413 medium priority: Ubuntu including 1 source packages (libapache2-mod-auth-openidc), 23 status rows across 23 suites (artful, bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, precise, questing, trusty, upstream, xenial, yakkety, zesty): not-affected 16, ignored 3, DNE 2, needed 1, released 1. https://ubuntu.com/security/CVE-2017-6413

Affected software / configurations for CVE-2017-6413

Vendor Product Version Raw CPE
openidc mod_auth_openidc <= 2.1.5 cpe:2.3:a:openidc:mod_auth_openidc:*:*:*:*:*:*:*:*

References for CVE-2017-6413

URL Tags
http://www.securityfocus.com/bid/96549
https://access.redhat.com/errata/RHSA-2019:2112
https://github.com/pingidentity/mod_auth_openidc/blob/master/ChangeLog Issue Tracking Patch Third Party Advisory
https://github.com/pingidentity/mod_auth_openidc/commit/21e3728a825c41ab41efa75e664108051bb9665e Issue Tracking Patch Third Party Advisory
https://github.com/pingidentity/mod_auth_openidc/releases/tag/v2.1.6 Patch Release Notes Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2V3HIGXMUKJGOBMAQAQPGC7G5YYWSUVA/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EJXBG3DG2FUYFGTUTSJFMPIINVFKKB4Z/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WTWUMQ46GZY3O4WU4JCF333LN53R2XQH/
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