CVE-2021-35053

Name: CVE-2021-35053
Creator: NVD / NIST
Published: 2021-11-03T20:15:08.347+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.52%

Last modified Jun 17, 2026

CVE-2021-35053 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.52% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.52%

82.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Kaspersky	Endpoint Security	>= 11.1.0, <= 11.6.0

References

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

Timeline

Published: Nov 3, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-35053?

How severe is CVE-2021-35053?

CVE-2021-35053 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.52% probability of exploitation in the next 30 days.

How do I fix CVE-2021-35053?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-35053?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST