Is CVE-2017-7798 in the CISA KEV catalog?

No. CVE-2017-7798 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2017-7798?

CVE-2017-7798 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2017-7798?

CVE-2017-7798 has an EPSS score of 2.10% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2017-7798?

Upgrade firefox on debian unstable to 55.0-1 or later. Fixes are available for 4 affected products.

CVE & CISA-KEV Catalog

CVE-2017-7798

HIGHEPSS 79th pctl

8.8

CVSS v3

NVD

Description

The Developer Tools feature suffers from a XUL injection vulnerability due to improper sanitization of the web page source code. In the worst case, this could allow arbitrary code execution when opening a malicious page with the style editor tool. This vulnerability affects Firefox ESR < 52.3 and Firefox < 55.

CWE-94Code Injection

How to fix

Remediation Available

firefoxDebian

Fixed in:55.0-1CVE-2017-7798

firefoxUbuntu

Fixed in:55.0.1+build2-0ubuntu0.14.04.2USN-3391-1

Fixed in:55.0.1+build2-0ubuntu0.16.04.2USN-3391-1

DeveloperEditionWindows application

Affected:52.3.0Fixed in:52.3.0Mozilla

Affected:55.0Fixed in:55.0Mozilla

Mozilla Firefox (en-US)Windows application

Affected:52.3.0Fixed in:52.3.0Mozilla

Affected:55.0Fixed in:55.0Mozilla

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

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.10%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Vendor Advisory3

Third-Party Advisory4

Related Vulnerabilities

Other CWE-94 (Code Injection) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-9841	Critical	9.8	100%	KEV	Fix
CVE-2015-1635	Critical	9.8	100%	KEV	-
CVE-2022-22954	Critical	9.8	100%	KEV + Ransom	-
CVE-2021-22204	Medium	6.8	100%	KEV	Fix
CVE-2025-3248	Critical	9.8	100%	KEV	Fix
CVE-2012-0158	High	8.8	100%	KEV	-

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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 2025-11-25.