CVE-2021-45457 | Overly broad CORS configuration

In Apache Kylin, Cross-origin requests with credentials are allowed to be sent from any origin. This issue affects Apache Kylin 2 version 2.6.6 and prior versions; Apache Kylin 3 version 3.1.2 and prior versions; Apache Kylin 4 version 4.0.0 and prior versions.

Published: 2022-01-06 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-45457 is rated Moderate Risk (60/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.34%). EPSS rose +1.50% over the last day, indicating growing attacker interest. 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-2021-45457

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 0.84% 2.34% +1.50%
2 2026-04-20 1.14% 0.84% -0.30%
3 2025-12-05 — 1.14% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-45457

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:H/I:N/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: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:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/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:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2021-45457

GitHub Security Advisory for CVE-2021-45457

GHSA-mgpf-hhgf-cxg4 · Severity: high · Ecosystem: maven — In Apache Kylin, Cross-origin requests with credentials are allowed to be sent from any origin.

Affected software / configurations for CVE-2021-45457

Vendor Product Version Raw CPE
apache kylin >= 2.0.0, <= 2.6.6 cpe:2.3:a:apache:kylin:*:*:*:*:*:*:*:*
apache kylin >= 3.0.0, < 3.1.3 cpe:2.3:a:apache:kylin:*:*:*:*:*:*:*:*
apache kylin 4.0.0 cpe:2.3:a:apache:kylin:4.0.0:-:*:*:*:*:*:*
apache kylin 4.0.0 cpe:2.3:a:apache:kylin:4.0.0:alpha:*:*:*:*:*:*
apache kylin 4.0.0 cpe:2.3:a:apache:kylin:4.0.0:beta:*:*:*:*:*:*

References for CVE-2021-45457

cvelogic Threat Intelligence