CVE-2019-20104

Exp

The OpenID client application in Atlassian Crowd before version 3.6.2, and from version 3.7.0 before 3.7.1 allows remote attackers to perform a Denial of Service attack via an XML Entity Expansion vulnerability.

Published: 2020-02-06 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-20104 is rated High Exploit Risk (75/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.43%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2019-20104

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-20104

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 2025-11-21 2.02% 2.43% +0.42%
2 2025-11-18 2.43% 2.02% -0.42%
3 2025-05-06 — 2.43% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-20104

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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: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:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P 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:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2019-20104

Affected software / configurations for CVE-2019-20104

Vendor Product Version Raw CPE
atlassian crowd < 3.2.11 cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*
atlassian crowd >= 3.3.0, < 3.3.8 cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*
atlassian crowd >= 3.4.0, < 3.4.7 cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*
atlassian crowd >= 3.5.0, < 3.5.2 cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*
atlassian crowd >= 3.6.0, < 3.6.2 cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*
atlassian crowd >= 3.6.3, < 3.7.1 cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*
atlassian crowd >= 3.7.2, < 4.0.0 cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*

References for CVE-2019-20104

cvelogic Threat Intelligence