How severe is CVE-2021-45918?

CVE-2021-45918 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-45918 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-45918?

CVE-2021-45918 affects Nhi Health Insurance Web Service Component. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-45918?

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

When was CVE-2021-45918 published?

CVE-2021-45918 was published on 2022-06-20 and last updated on 2026-06-17.

CVE-2021-45918

CVE-2021-45918 is a high-severity vulnerability in Nhi Health Insurance Web Service Component with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-1284.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 1% (70th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-1284
Affected product: Nhi Health Insurance Web Service Component
Published: 2022-06-20
Last modified: 2026-06-17

Description

NHI’s health insurance web service component has insufficient validation for input string length, which can result in heap-based buffer overflow attack. A remote attacker can exploit this vulnerability to flood the memory space reserved for the program, in order to terminate service without authentication, which requires a system restart to recover service.

Frequently asked questions

What is CVE-2021-45918?: NHI’s health insurance web service component has insufficient validation for input string length, which can result in heap-based buffer overflow attack. A remote attacker can exploit this vulnerability to flood the memory space reserved for the program, in order to terminate service without authentication, which requires a system restart to recover service.
How severe is CVE-2021-45918?: CVE-2021-45918 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-45918 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (70th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-45918?: CVE-2021-45918 affects Nhi Health Insurance Web Service Component. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-45918?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-45918 published?: CVE-2021-45918 was published on 2022-06-20 and last updated on 2026-06-17.

References

https://www.twcert.org.tw/tw/cp-132-6227-eaf49-1.html

Affected products (1)

cpe:2.3:a:nhi:health_insurance_web_service_component:-:*:*:*:*:*:*:*

More vulnerabilities in Nhi Health Insurance Web Service Component

CVE-2022-35217 — High (CVSS 7.8): The NHI card’s web service component has a stack-based buffer overflow vulnerability due to insufficient validation…
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