CVE-2017-16853

The DynamicMetadataProvider class in saml/saml2/metadata/impl/DynamicMetadataProvider.cpp in OpenSAML-C in OpenSAML before 2.6.1 fails to properly configure itself with the MetadataFilter plugins and does not perform critical security checks such as signature verification, enforcement of validity periods, and other checks specific to deployments, aka CPPOST-105.

Published: 2017-11-16 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-16853 is rated Moderate Risk (57.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.40%). Review affected assets and schedule 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-2017-16853

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 0.67% 1.40% +0.73%
2 2025-03-17 1.85% 0.67% -1.18%
3 2024-12-17 — 1.85% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-16853

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.1 3.0 HIGH
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H 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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.2 5.9 [email protected]
6.8 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 6.4 [email protected]

Weakness enumeration for CVE-2017-16853

OS Trackers for CVE-2017-16853

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2017-16853
suse high CVE-2017-16853 severity important: SUSE including 20 source package names (libsaml-devel, libsaml-devel-2.5.5-3.3.1, …), 93 product×package rows across 34 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (34 product lines)): Fixed 55, Known Not Affected 38. https://www.suse.com/security/cve/CVE-2017-16853/
ubuntu medium CVE-2017-16853 medium priority: Ubuntu including 1 source packages (opensaml2), 7 status rows across 7 suites (artful, bionic, cosmic, trusty, upstream, xenial, zesty): released 5, not-affected 2. https://ubuntu.com/security/CVE-2017-16853

Affected software / configurations for CVE-2017-16853

Vendor Product Version Raw CPE
shibboleth opensaml < 2.6.1 cpe:2.3:a:shibboleth:opensaml:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2017-16853

cvelogic Threat Intelligence