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CVE-2021-29975

MEDIUMCVSS 6.5/10EPSS 0.97%

Last modified

CVE-2021-29975 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Through a series of DOM manipulations, a message, over which the attacker had control of the text but not HTML or formatting, could be overlaid on top of another domain (with the new domain correctly shown in the address bar) resulting in possible user confusion. This vulnerability affects Firefox < 90.. EPSS estimates a 0.97% chance of exploitation in the next 30 days.

Description

Through a series of DOM manipulations, a message, over which the attacker had control of the text but not HTML or formatting, could be overlaid on top of another domain (with the new domain correctly shown in the address bar) resulting in possible user confusion. This vulnerability affects Firefox < 90.

Metrics

CVSS 3.1
6.5/10

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

EPSS Probability
0.97%

57.2th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
MozillaFirefox< 90.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-29975?
Through a series of DOM manipulations, a message, over which the attacker had control of the text but not HTML or formatting, could be overlaid on top of another domain (with the new domain correctly shown in the address bar) resulting in possible user confusion. This vulnerability affects Firefox < 90.
How severe is CVE-2021-29975?
CVE-2021-29975 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.97% probability of exploitation in the next 30 days.
How do I fix CVE-2021-29975?
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-2021-29975?

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

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Source: NVD / NIST