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Vulnerability record · CVE-2021-35053 · published 3 November 2021

CVE-2021-35053: Kaspersky endpoint security vulnerability

Kaspersky · Endpoint Security

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.

7.5 CVSS 3.1 High EPSS 2.6% · top 15.2%
7.5CVSS 3.1 base score, v2 7.8
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://support.kaspersky.com/general/vulnerability.aspx?el=12430#01112021 Broken Link
https://www.zerodayinitiative.com/advisories/ZDI-21-1280/ Third Party AdvisoryVDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-431/ Third Party AdvisoryVDB Entry
https://support.kaspersky.com/general/vulnerability.aspx?el=12430#01112021 Broken Link
https://www.zerodayinitiative.com/advisories/ZDI-21-1280/ Third Party AdvisoryVDB Entry
https://www.zerodayinitiative.com/advisories/ZDI-22-431/ Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-27534Kaspersky anti-virus vulnerabilityKaspersky Anti-Virus products for home and Kaspersky Endpoint Security with antivirus databases released before 12 March 2022 had a bug in a data par…EPSS 3.1%6.8CVE-2020-26200Kaspersky endpoint security improper authentication vulnerabilityA component of Kaspersky custom boot loader allowed loading of untrusted UEFI modules due to insufficient check of their authenticity. This component…EPSS 0.23%5.5CVE-2021-27223Kaspersky anti-virus vulnerabilityA denial-of-service issue existed in one of modules that was incorporated in Kaspersky Anti-Virus products for home and Kaspersky Endpoint Security. …EPSS 0.20%

Source: NIST National Vulnerability Database (record CVE-2021-35053), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.