Is CVE-2017-7839 in the CISA KEV catalog?

No. CVE-2017-7839 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-7839?

CVE-2017-7839 has a CVSS v3 base score of 6.1 (MEDIUM).

What is the EPSS score for CVE-2017-7839?

CVE-2017-7839 has an EPSS score of 1.14% (63th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-7839?

Upgrade firefox on debian unstable to 57.0-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2017-7839

MEDIUM

6.1

CVSS v3

NVD

Description

Control characters prepended before "javascript:" URLs pasted in the addressbar can cause the leading characters to be ignored and the pasted JavaScript to be executed instead of being blocked. This could be used in social engineering and self-cross-site-scripting (self-XSS) attacks where users are convinced to copy and paste text into the addressbar. This vulnerability affects Firefox < 57.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

firefoxDebian

Fixed in:57.0-1CVE-2017-7839

firefoxUbuntu

Fixed in:57.0+build4-0ubuntu0.14.04.4USN-3477-1

Fixed in:57.0+build4-0ubuntu0.16.04.5USN-3477-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploit Intelligence

1.14%probability of exploitation in 30 days

63rdpercentile

Moderate risk: more likely to be exploited than 63% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Third-Party Advisory2

Issue Tracking1

bugzilla.mozilla.org

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.