How severe is CVE-2021-31518?

CVE-2021-31518 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-2021-31518 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-31518?

CVE-2021-31518 primarily affects Trendmicro Home Network Security. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-31518?

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-2021-31518 published?

CVE-2021-31518 was published on 2021-05-05 and last updated on 2026-06-17.

CVE-2021-31518

CVE-2021-31518 is a high-severity vulnerability in Trendmicro Home Network Security 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.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 7.8
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Trendmicro Home Network Security
Published: 2021-05-05
Last modified: 2026-06-17

Description

Trend Micro Home Network Security 6.5.599 and earlier is vulnerable to a file-parsing vulnerability which could allow an attacker to exploit the vulnerability and cause a denial-of-service to the device. This vulnerability is similar, but not identical to CVE-2021-31517.

Frequently asked questions

What is CVE-2021-31518?: Trend Micro Home Network Security 6.5.599 and earlier is vulnerable to a file-parsing vulnerability which could allow an attacker to exploit the vulnerability and cause a denial-of-service to the device. This vulnerability is similar, but not identical to CVE-2021-31517.
How severe is CVE-2021-31518?: CVE-2021-31518 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-2021-31518 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-31518?: CVE-2021-31518 primarily affects Trendmicro Home Network Security. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-31518?: 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-2021-31518 published?: CVE-2021-31518 was published on 2021-05-05 and last updated on 2026-06-17.

References

https://helpcenter.trendmicro.com/en-us/article/TMKA-10312

Affected products (3)

cpe:2.3:a:trendmicro:home_network_security:*:*:*:en:*:*:*:*
cpe:2.3:a:trendmicro:home_network_security:*:*:*:ja:*:*:*:*
cpe:2.3:a:trendmicro:home_network_security:*:*:*:zh:*:*:*:*

More vulnerabilities in Trendmicro Home Network Security

CVE-2021-32458 — High (CVSS 7.8): Trend Micro Home Network Security version 6.6.604 and earlier is vulnerable to an iotcl stack-based buffer overflow…
CVE-2021-32457 — High (CVSS 7.8): Trend Micro Home Network Security version 6.6.604 and earlier is vulnerable to an iotcl stack-based buffer overflow…
CVE-2021-31517 — High (CVSS 7.5): Trend Micro Home Network Security 6.5.599 and earlier is vulnerable to a file-parsing vulnerability which could allow…
CVE-2021-32459 — Medium (CVSS 6.5): Trend Micro Home Network Security version 6.6.604 and earlier contains a hard-coded password vulnerability in the log…

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