How severe is CVE-2021-35402?

CVE-2021-35402 has a CVSS 3.x base score of 10.0, 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-2021-35402 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2021-35402?

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.

Does CVE-2021-35402 have an EU (EUVD) identifier?

Yes. CVE-2021-35402 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-22045.

When was CVE-2021-35402 published?

CVE-2021-35402 was published on 2026-02-20 and last updated on 2026-06-17.

CVE-2021-35402

CVE-2021-35402 is a critical-severity vulnerability with a CVSS 3.x base score of 10.0. 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
EPSS exploit prediction: 1% (57th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2021-22045
Weakness: CWE-78
Published: 2026-02-20
Last modified: 2026-06-17

Description

PROLiNK PRC2402M 20190909 before 2021-06-13 allows live_api.cgi?page=satellite_list OS command injection via shell metacharacters in the ip parameter (for satellite_status).

Frequently asked questions

What is CVE-2021-35402?: PROLiNK PRC2402M 20190909 before 2021-06-13 allows live_api.cgi?page=satellite_list OS command injection via shell metacharacters in the ip parameter (for satellite_status).
How severe is CVE-2021-35402?: CVE-2021-35402 has a CVSS 3.x base score of 10.0, 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-2021-35402 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (57th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2021-35402?: 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.
Does CVE-2021-35402 have an EU (EUVD) identifier?: Yes. CVE-2021-35402 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-22045.
When was CVE-2021-35402 published?: CVE-2021-35402 was published on 2026-02-20 and last updated on 2026-06-17.

References

https://starlabs.sg/advisories/21/21-35402/

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