CVE-2021-45918: NHI’s health insurance web service component has insufficient validation for input string length, which can re

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HIGH 7.5REMOTEMITIGATE

CVE-2021-45918 is a high-severity flaw (CVSS 7.5) affecting health insurance web service component. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Remotely exploitable, no login, no user action

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.5% (top 25%)
CISA exploited list	No
Weakness	CWE-122, CWE-1284
Published	2022-06-20
Last modified	2026-06-17

Publisher (CNA): TWCERT/CC · Vendor: nhi

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-06-20 06:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

nhi health insurance web service component MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy health-insurance-web-service-component || rpm -q health-insurance-web-service-component || health-insurance-web-service-component --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-45918?

health insurance web service component: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-45918 being exploited?

CVE-2021-45918 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-45918 affect?

CVE-2021-45918 affects health insurance web service component. Severity is high (CVSS 7.5). 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

How urgent is CVE-2021-45918?

Priority 50/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-35219 MEDIUM 5.5 MITIGATE The NHI card’s web service component has a stack-based buffer overflow vulnerability due to insufficient valid
CVE-2022-35218 MEDIUM 5.5 MITIGATE The NHI card’s web service component has a heap-based buffer overflow vulnerability due to insufficient valida
CVE-2022-35217 HIGH 7.8 MITIGATE The NHI card’s web service component has a stack-based buffer overflow vulnerability due to insufficient valid

References

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