How severe is CVE-2017-18256?

CVE-2017-18256 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2017-18256 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2017-18256?

CVE-2017-18256 affects Brave Brave Browser. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2017-18256?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2017-18256 published?

CVE-2017-18256 was published on 2018-04-04 and last updated on 2026-06-17.

CVE-2017-18256

CVE-2017-18256 is a medium-severity vulnerability in Brave Brave Browser with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.3
EPSS exploit prediction: 5% (91st percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Brave Brave Browser
Published: 2018-04-04
Last modified: 2026-06-17

Description

Brave Browser before 0.13.0 allows remote attackers to cause a denial of service (resource consumption) via a long alert() argument in JavaScript code, because window dialogs are mishandled.

Frequently asked questions

What is CVE-2017-18256?: Brave Browser before 0.13.0 allows remote attackers to cause a denial of service (resource consumption) via a long alert() argument in JavaScript code, because window dialogs are mishandled.
How severe is CVE-2017-18256?: CVE-2017-18256 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2017-18256 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 5% (91st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2017-18256?: CVE-2017-18256 affects Brave Brave Browser. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2017-18256?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2017-18256 published?: CVE-2017-18256 was published on 2018-04-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:brave:brave_browser:*:*:*:*:*:*:*:*

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