CVE-2017-18256

Exp

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.

Published: 2018-04-04 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-18256 is rated High Exploit Risk (77.9/100): CVSS Medium severity, with high exploitation likelihood (EPSS 11.22%, 93th percentile). 3 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +4.25% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2017-18256

EDB-ID Source Kind Published Link
44474 exploit_db edb 2018-04-17 Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-18256

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-07-11 6.97% 11.22% +4.25%
2 2025-03-30 5.90% 6.97% +1.07%
3 2025-03-29 — 5.90% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-18256

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2017-18256

Affected software / configurations for CVE-2017-18256

Vendor Product Version Raw CPE
brave brave_browser < 0.13.0 cpe:2.3:a:brave:brave_browser:*:*:*:*:*:*:*:*

References for CVE-2017-18256

URL Tags
https://hackerone.com/reports/176066 Exploit Third Party Advisory
https://www.exploit-db.com/exploits/44474/ Exploit Third Party Advisory VDB Entry
cvelogic Threat Intelligence