CVE-2017-5419

Public Exploit

Description

If a malicious site repeatedly triggers a modal authentication prompt, eventually the browser UI will become non-responsive, requiring shutdown through the operating system. This is a denial of service (DOS) attack. This vulnerability affects Firefox < 52 and Thunderbird < 52.

7.5

CVSS

Severity: High

CVSS 3.0 •

CVSS 2.0 •

EPSS 2.17% Top 20%

Vendor Advisory mozilla.org Vendor Advisory mozilla.org

Affected: Mozilla Firefox

Affected: Mozilla Thunderbird

References

Link	Tags
https://www.mozilla.org/security/advisories/mfsa2017-09/	vendor advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1312243	patch issue tracking exploit
https://www.mozilla.org/security/advisories/mfsa2017-05/	vendor advisory
http://www.securitytracker.com/id/1037966	third party advisory vdb entry
http://www.securityfocus.com/bid/96692	third party advisory vdb entry

Frequently Asked Questions

What is the severity of CVE-2017-5419?: CVE-2017-5419 has been scored as a high severity vulnerability.
How to fix CVE-2017-5419?: To fix CVE-2017-5419, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2017-5419 being actively exploited in the wild?: It is possible that CVE-2017-5419 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2017-5419?: CVE-2017-5419 affects Mozilla Firefox, Mozilla Thunderbird.

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