CVE & CISA-KEV Catalog

CVE-2017-5390

CRITICALEPSS 89th pctl
9.8
CVSS v3
NVD

Description

The JSON viewer in the Developer Tools uses insecure methods to create a communication channel for copying and viewing JSON or HTTP headers data, allowing for potential privilege escalation. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

How to fix

Remediation Available
firefoxDebian
Fixed in:51.0-1CVE-2017-5390
firefoxUbuntu
Fixed in:51.0.1+build2-0ubuntu0.14.04.1USN-3175-1
Fixed in:51.0.1+build2-0ubuntu0.16.04.1USN-3175-1
thunderbirdUbuntu
Fixed in:1:45.7.0+build1-0ubuntu0.14.04.1USN-3165-1
Fixed in:1:45.7.0+build1-0ubuntu0.16.04.1USN-3165-1
DeveloperEditionWindows application
Affected:45.7.0Fixed in:45.7.0Mozilla
Affected:51.0Fixed in:51.0Mozilla
Mozilla Firefox (en-US)Windows application
Affected:51.0Fixed in:51.0Mozilla
Affected:45.7.0Fixed in:45.7.0Mozilla
Mozilla Thunderbird (en-US)Windows application
Affected:45.7.0Fixed in:45.7.0Mozilla

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 InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

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

Exploit Intelligence

3.96%probability of exploitation in 30 days
89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

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HTML

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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.