How severe is CVE-2021-35053?

CVE-2021-35053 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-2021-35053 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-35053?

CVE-2021-35053 affects Kaspersky Endpoint Security. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-35053?

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-2021-35053 published?

CVE-2021-35053 was published on 2021-11-03 and last updated on 2026-06-17.

CVE-2021-35053

CVE-2021-35053 is a high-severity vulnerability in Kaspersky Endpoint 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: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Kaspersky Endpoint Security
Published: 2021-11-03
Last modified: 2026-06-17

Description

Possible system denial of service in case of arbitrary changing Firefox browser parameters. An attacker could change specific Firefox browser parameters file in a certain way and then reboot the system to make the system unbootable.

Frequently asked questions

What is CVE-2021-35053?: Possible system denial of service in case of arbitrary changing Firefox browser parameters. An attacker could change specific Firefox browser parameters file in a certain way and then reboot the system to make the system unbootable.
How severe is CVE-2021-35053?: CVE-2021-35053 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-2021-35053 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-35053?: CVE-2021-35053 affects Kaspersky Endpoint Security. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-35053?: 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-2021-35053 published?: CVE-2021-35053 was published on 2021-11-03 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kaspersky:endpoint_security:*:*:*:*:*:*:*:*

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