CVE-2017-5400: Mozilla Firefox vulnerability

CVE-2017-5400: JIT-spray targeting asm.js combined with a heap spray allows for a bypass of ASLR and DEP protections leadi...

JIT-spray targeting asm.js combined with a heap spray allows for a bypass of ASLR and DEP protections leading to potential memory corruption attacks. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 14:55 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2017-5400 is a Mozilla browser and mail-client flaw where crafted JavaScript techniques could bypass memory protections and support memory corruption attacks. It affects old Firefox, Firefox ESR, and Thunderbird versions. The business risk is mainly legacy endpoint exposure, not modern fully patched installations. Exposure is likely limited to systems still running the affected 2017-era Mozilla versions, including unmanaged desktops, legacy VDI images, servers with GUI/mail tooling, and long-lived Linux distributions without backported security updates. Treat this as a high-priority legacy software cleanup issue. Modern patched systems should not be affected, but any remaining vulnerable Mozilla clients represent browser or email attack surface with weakened exploit protections. Mitigation focus: Upgrade Firefox to version 52 or later where applicable.; Upgrade Firefox ESR to version 45.8 or later where applicable.; Upgrade Thunderbird to version 52 or 45.8 or later as applicable..

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

Conservative CVE-to-ATT&CK context

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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

10Source 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://www.mozilla.org/security/advisories/mfsa2017-09/CVE reference · x_refsource_CONFIRM
DSA-3832CVE reference · vendor-advisory, x_refsource_DEBIAN
https://www.mozilla.org/security/advisories/mfsa2017-07/CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2017-05/CVE reference · x_refsource_CONFIRM
GLSA-201705-06CVE reference · vendor-advisory, x_refsource_GENTOO
DSA-3805CVE reference · vendor-advisory, x_refsource_DEBIAN
https://www.mozilla.org/security/advisories/mfsa2017-06/CVE reference · x_refsource_CONFIRM
GLSA-201705-07CVE reference · vendor-advisory, x_refsource_GENTOO
https://bugzilla.mozilla.org/show_bug.cgi?id=1334933CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaFirefoxunspecifiedListed

MozillaFirefox ESRunspecifiedListed

MozillaThunderbirdunspecified, unspecifiedListed

Weakness

CWE details

No CWE listed

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