CVE-2017-5427: Mozilla Firefox vulnerability

CVE-2017-5427: A non-existent chrome.manifest file will attempt to be loaded during startup from the primary installation...

A non-existent chrome.manifest file will attempt to be loaded during startup from the primary installation directory. If a malicious user with local access puts chrome.manifest and other referenced files in this directory, they will be loaded and activated during startup. This could result in malicious software being added without consent or modification of referenced installed files. This vulnerability affects Firefox < 52.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 15:04 UTC (UTC+00:00)

Security readout for executives and security teams

Firefox before version 52 could load a malicious chrome.manifest file placed in its primary installation directory during startup. A local attacker who can write there could cause Firefox to activate referenced malicious files, adding software without user consent. Exposure is mainly legacy endpoints still running Firefox below 52, especially where non-administrative users or malware can write to the Firefox installation directory. Modern supported Firefox deployments are unlikely to be exposed. Treat this as a legacy hygiene and endpoint hardening issue. Prioritize remediation where old Firefox versions remain on shared workstations, kiosks, lab systems, or unmanaged endpoints. Mitigation focus: Upgrade Firefox to version 52 or later, preferably a currently supported release.; Restrict write access to Firefox installation directories to trusted administrators only.; Investigate and remove unauthorized chrome.manifest files from Firefox installation paths..

Prepared: Jun 7, 2026, 06:44 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jun 11, 2018, 21:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://bugzilla.mozilla.org/show_bug.cgi?id=1295542CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2017-05/CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefoxunspecifiedListed

Weakness

CWE details

No CWE listed

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