CVE-2016-6496

The LDAP directory connector in Atlassian Crowd before 2.8.8 and 2.9.x before 2.9.5 allows remote...

9.8 Critical

The LDAP directory connector in Atlassian Crowd before 2.8.8 and 2.9.x before 2.9.5 allows remote attackers to execute arbitrary code via an LDAP attribute with a crafted serialized Java object, aka LDAP entry poisoning.

Attack profile

How easy it is to exploit

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

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

4.71%Down 1.1 points since Feb 4, 2022

What each source reports

NVD Score used 9.8

Record: CVE-2016-6496
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-20
Updated: 2026-11-02

CVE List No score

Record: CVE-2016-6496
Updated: 2026-11-02

EUVDEUVD-2016-7418 No score

Record: EUVD-2016-7418
Updated: 2026-11-03

GitHub AdvisoriesGHSA-gqpx-798c-8554 9.8

The LDAP directory connector in Atlassian Crowd before 2.8.8 and 2.9.x before 2.9.5 allows remote...

Record: GHSA-gqpx-798c-8554
CVSS 3.0: 9.8 CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-20
Updated: 2026-11-02

Affected products

atlassian crowd

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-6496 is a critical vulnerability (CVSS 9.8) in Atlassian Crowd, published December 9, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 4.71%, the 91st percentile. No source names a fixed version.