CVE-2017-5383: Mozilla Thunderbird vulnerability

CVE-2017-5383: URLs containing certain unicode glyphs for alternative hyphens and quotes do not properly trigger punycode...

URLs containing certain unicode glyphs for alternative hyphens and quotes do not properly trigger punycode display, allowing for domain name spoofing attacks in the location bar. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

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

Security readout for executives and security teams

This is a Mozilla URL display spoofing issue. Certain Unicode characters resembling hyphens or quotes could make a malicious domain appear more legitimate in the address bar instead of showing punycode. The main business risk is phishing against users running old Firefox, Firefox ESR, or Thunderbird versions. Exposure is most likely on legacy endpoints, unmanaged systems, or frozen enterprise images still running affected Mozilla versions or old vendor packages from before the 2017 fixes. Treat as a legacy phishing-control issue. Prioritize remediation where old Mozilla clients remain in production, especially on systems used for email, authentication, finance, or administrative access. Mitigation focus: Upgrade Firefox to 51 or later where applicable.; Upgrade Firefox ESR and Thunderbird to 45.7 or later.; Apply relevant Debian, Gentoo, or Red Hat vendor security updates..

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

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/mfsa2017-03/CVE reference · x_refsource_CONFIRM
https://www.mozilla.org/security/advisories/mfsa2017-02/CVE reference · x_refsource_CONFIRM
GLSA-201702-22CVE reference · vendor-advisory, x_refsource_GENTOO
https://bugzilla.mozilla.org/show_bug.cgi?id=1323338CVE reference · x_refsource_CONFIRM
DSA-3832CVE reference · vendor-advisory, x_refsource_DEBIAN
GLSA-201702-13CVE reference · vendor-advisory, x_refsource_GENTOO
DSA-3771CVE reference · vendor-advisory, x_refsource_DEBIAN
https://www.mozilla.org/security/advisories/mfsa2017-01/CVE reference · x_refsource_CONFIRM
https://bugzilla.mozilla.org/show_bug.cgi?id=1324716CVE reference · x_refsource_CONFIRM

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

MozillaThunderbirdunspecifiedListed

MozillaFirefox ESRunspecifiedListed

MozillaFirefoxunspecifiedListed

Weakness

CWE details

No CWE listed

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