CVE-2019-11728

MEDIUMNVD 4.74.7—Trending — 4 sources updated this week

4.7

The HTTP Alternative Services header, Alt-Svc, can be used by a malicious site to scan all TCP ports of any host that the accessible to a user when web content is loaded. This vulnerability affects Firefox < 68.

CVSS v3: 4.7
EG Score: 4.7(medium)
EPSS: 70.6%
KEV: Not listed

Published

July 23, 2019

Last Modified

November 21, 2024

References (14)

security@mozillahttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
security@mozillahttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
security@mozillahttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
security@mozillahttp://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=1552993
security@mozillahttps://security.gentoo.org/glsa/201908-12
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2019-21/
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
af854a3a-2127-422b-91ae-364da2661108http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.mozilla.org/show_bug.cgi?id=1552993
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/201908-12
af854a3a-2127-422b-91ae-364da2661108https://www.mozilla.org/security/advisories/mfsa2019-21/

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	firefox-mozsymbols (68.0+build3-0ubuntu0.16.04.1) @ xenial	2026-05-27	ubuntu

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-668Exposure of Resource to Wrong Sphere

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

UbuntuUSN-4054-1MEDIUM
Firefox vulnerabilities

Data Freshness Timeline

(refreshed 12× in last 7d / 18× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 17:04 UTCEG score recompute
2026-05-27 17:04 UTCVendor advisory
2026-05-27 17:03 UTCGHSA enrichment
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-25 22:16 UTCOSV refresh

Frequently asked(5)

What is CVE-2019-11728?

CVE-2019-11728 is a medium vulnerability published on July 23, 2019. The HTTP Alternative Services header, Alt-Svc, can be used by a malicious site to scan all TCP ports of any host that the accessible to a user when web content is loaded. This vulnerability affects Firefox < 68.

When was CVE-2019-11728 disclosed?

CVE-2019-11728 was first published in the National Vulnerability Database on July 23, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2019-11728 actively exploited?

CVE-2019-11728 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 70.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-11728?

CVE-2019-11728 has a CVSS v3 base score of 4.7 (NVD).

How do I remediate CVE-2019-11728?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-11728, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2019-11728

Published

Last Modified

References (14)

Patch Availability(1)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-11728?

Same vendor

Same CWE

CVE-2019-11728

📅 Published

🔄 Last Modified

🔗 References (14)

Patch Availability(1)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-11728?

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References (14)

Frequently asked(5)

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