CVE-2017-16853

The DynamicMetadataProvider class in saml/saml2/metadata/impl/DynamicMetadataProvider.cpp in...

8.1 HighFix available

CVE-2017-16853 is a high vulnerability (CVSS 8.1) in Shibboleth Opensaml, published November 16, 2017. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.40%, the 72nd percentile. Fixed in opensaml2 2.4.3-4+deb7u2.

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.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

1.40%Down 0.1 points since Apr 14, 2021

What each source reports

NVD Score used 8.1

Record: CVE-2017-16853
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-347
Updated: 2026-11-02

CVE List No score

Record: CVE-2017-16853
Updated: 2026-11-02

EUVDEUVD-2017-8027 No score

Record: EUVD-2017-8027
Updated: 2026-11-03

GitHub AdvisoriesGHSA-hrv7-jmr6-cr43 8.1

The DynamicMetadataProvider class in saml/saml2/metadata/impl/DynamicMetadataProvider.cpp in...

Record: GHSA-hrv7-jmr6-cr43
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-347
Updated: 2026-11-02

OSVUBUNTU-CVE-2017-16853 8.1

Record: UBUNTU-CVE-2017-16853
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVopenSUSE-SU-2024:11122-1 No score

libsaml-devel-3.2.0-1.2 on GA media

These are all security issues fixed in the libsaml-devel-3.2.0-1.2 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:11122-1
Updated: 2026-11-02

OSVSUSE-SU-2017:3234-1 No score

Security update for opensaml

This update for opensaml fixes the following issues:

Security issue fixed:

CVE-2017-16853: Fix the DynamicMetadataProvider class to properly configure itself with the MetadataFilter plugins, to avoid possible MITM attacks (bsc#1068685).

Record: SUSE-SU-2017:3234-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`opensaml2` Debian:7	before 2.4.3-4+deb7u2, plus listed versions 2.4.3-42.4.3-4+deb7u1	2.4.3-4+deb7u2
`opensaml2` Debian:8	before 2.5.3-2+deb8u2, plus listed versions 2.5.3-22.5.3-2+deb8u1	2.5.3-2+deb8u2
`opensaml2` Debian:9	before 2.6.0-4+deb9u1, plus listed versions 2.6.0-42.6.0-4+deb9u1~bpo8+1	2.6.0-4+deb9u1
`opensaml` SUSE:Linux Enterprise Server for Raspberry Pi 12 SP2	before 2.5.5-3.3.1	2.5.5-3.3.1
`opensaml` SUSE:Linux Enterprise Software Development Kit 12 SP2	before 2.5.5-3.3.1	2.5.5-3.3.1
`opensaml` SUSE:Linux Enterprise Software Development Kit 12 SP3	before 2.5.5-3.3.1	2.5.5-3.3.1
`opensaml` SUSE:Linux Enterprise Server 12 SP2	before 2.5.5-3.3.1	2.5.5-3.3.1
`opensaml` SUSE:Linux Enterprise Server for SAP Applications 12 SP2	before 2.5.5-3.3.1	2.5.5-3.3.1
`opensaml` SUSE:Linux Enterprise Server 12 SP3	before 2.5.5-3.3.1	2.5.5-3.3.1
`opensaml` SUSE:Linux Enterprise Server for SAP Applications 12 SP3	before 2.5.5-3.3.1	2.5.5-3.3.1
`opensaml2` Ubuntu:14.04:LTS	before 2.5.3-2+deb8u2build0.14.04.1, plus listed versions 2.5.3-2	2.5.3-2+deb8u2build0.14.04.1
`opensaml2` Ubuntu:16.04:LTS	before 2.5.5-1ubuntu0.1, plus listed versions 2.5.3-2.1ubuntu22.5.5-1	2.5.5-1ubuntu0.1

History

History
When	Changed	Sources
2026-11-03	aliases	EUVD
2026-11-02	created	CVE List, GitHub Advisories, NVD, OSV

References

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