How severe is CVE-2021-45456?

CVE-2021-45456 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-45456 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 89% (100th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45456?

CVE-2021-45456 primarily affects Apache Kylin. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-45456?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2021-45456 published?

CVE-2021-45456 was published on 2022-01-06 and last updated on 2026-06-17.

CVE-2021-45456

CVE-2021-45456 is a critical-severity vulnerability in Apache Kylin with a CVSS 3.x base score of 9.8. Its EPSS exploit-prediction score of 89% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-77.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 89% (100th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-77
Affected product: Apache Kylin
Published: 2022-01-06
Last modified: 2026-06-17

Description

Apache kylin checks the legitimacy of the project before executing some commands with the project name passed in by the user. There is a mismatch between what is being checked and what is being used as the shell command argument in DiagnosisService. This may cause an illegal project name to pass the check and perform the following steps, resulting in a command injection vulnerability. This issue affects Apache Kylin 4.0.0.

Frequently asked questions

What is CVE-2021-45456?: Apache kylin checks the legitimacy of the project before executing some commands with the project name passed in by the user. There is a mismatch between what is being checked and what is being used as the shell command argument in DiagnosisService. This may cause an illegal project name to pass the check and perform the following steps, resulting in a command injection vulnerability. This issue affects Apache Kylin 4.0.0.
How severe is CVE-2021-45456?: CVE-2021-45456 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-45456 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 89% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45456?: CVE-2021-45456 primarily affects Apache Kylin. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-45456?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-45456 published?: CVE-2021-45456 was published on 2022-01-06 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:apache:kylin:4.0.0:-:*:*:*:*:*:*
cpe:2.3:a:apache:kylin:4.0.0:alpha:*:*:*:*:*:*
cpe:2.3:a:apache:kylin:4.0.0:beta:*:*:*:*:*:*

More vulnerabilities in Apache Kylin

CVE-2022-44621 — Critical (CVSS 9.8): Diagnosis Controller miss parameter validation, so user may attacked by command injection via HTTP Request.
CVE-2022-24697 — Critical (CVSS 9.8): Kylin's cube designer function has a command injection vulnerability when overwriting system parameters in the…
CVE-2021-31522 — Critical (CVSS 9.8): Kylin can receive user input and load any class through Class.forName(...). This issue affects Apache Kylin 2 version…
CVE-2020-13926 — Critical (CVSS 9.8): Kylin concatenates and executes a Hive SQL in Hive CLI or beeline when building a new segment; some part of the HQL is…
CVE-2020-13925 — Critical (CVSS 9.8): Similar to CVE-2020-1956, Kylin has one more restful API which concatenates the API inputs into OS commands and then…
CVE-2024-23590 — Critical (CVSS 9.1): Session Fixation vulnerability in Apache Kylin. This issue affects Apache Kylin: from 2.0.0 through 4.x. Users are…

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