CVE-2017-7811: Mozilla Firefox vulnerability

CVE-2017-7811: Memory safety bugs were reported in Firefox 55.

Memory safety bugs were reported in Firefox 55. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 56.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 16:12 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2017-7811 covers memory safety defects in Firefox 55. Mozilla reported evidence of memory corruption and assessed that some bugs could potentially be exploited to run arbitrary code. The business risk is mainly from outdated Firefox installations older than version 56. Exposure is limited to Mozilla Firefox installations below version 56. The provided sources do not identify other affected Mozilla products, platforms, or special configurations. Treat this as a legacy browser cleanup priority. It is not shown as actively exploited in the provided sources, but possible code execution in an outdated browser justifies prompt removal or upgrade of affected Firefox versions. Mitigation focus: Upgrade Firefox installations below version 56 to a non-affected version.; Follow Mozilla advisory MFSA2017-21 for vendor-confirmed remediation guidance.; Remove unsupported legacy Firefox builds from managed endpoints..

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://www.mozilla.org/security/advisories/mfsa2017-21/CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1392105%2C1395919%2C1388113%2C1348955%2C1394522%2C1387659%2C1369560%2C1388045%2C1378658%2C1379414%2C1385112%2C1367497CVE 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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