CVE-2017-7781: Mozilla Firefox vulnerability

CVE-2017-7781: An error occurs in the elliptic curve point addition algorithm that uses mixed Jacobian-affine coordinates...

An error occurs in the elliptic curve point addition algorithm that uses mixed Jacobian-affine coordinates where it can yield a result "POINT_AT_INFINITY" when it should not. A man-in-the-middle attacker could use this to interfere with a connection, resulting in an attacked party computing an incorrect shared secret. This vulnerability affects Firefox < 55.

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

Security readout for executives and security teams

Firefox versions before 55 had a cryptographic calculation bug that could let a man-in-the-middle interfere with a connection. The source bundle does not show active exploitation or a CVSS score. Business risk is mainly legacy browser exposure, especially where old Firefox is still used for sensitive web sessions. Exposure is limited to systems still running Firefox versions earlier than 55. Modern, supported Firefox deployments should not be assumed affected from this bundle. Confirm any embedded, kiosk, VDI, or unmanaged endpoints that may retain legacy browser versions. Address this as a legacy exposure cleanup item. It is not KEV-listed in the provided bundle, but outdated browsers handling sensitive sessions create avoidable cryptographic risk. Mitigation focus: Upgrade Firefox to version 55 or a current supported release.; Remove or isolate Firefox versions earlier than 55 from business use.; Check Mozilla MFSA2017-18 and vendor guidance for remediation details..

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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CVE-2017-7781 mapping review

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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/mfsa2017-18/CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=1352039CVE 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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