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NVD / CVE Program· CNA mozilla

CVE-2019-11728: 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 us

Noroxi assessment

Priority: Monitor (action score 18/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.1% (FIRST EPSS); higher than 65.8% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: enigmail (openSUSE:Leap 15.0) 2.1.2-lp150.34.1; MozillaFirefox (openSUSE:Leap 15.0) 68.1.0-lp150.3.66.1; MozillaThunderbird (openSUSE:Leap 15.0) 68.1.1-lp150.3.51.1.

Low priority for now. Upgrade to enigmail (openSUSE:Leap 15.0) 2.1.2-lp150.34.1; MozillaFirefox (openSUSE:Leap 15.0) 68.1.0-lp150.3.66.1; MozillaThunderbird (openSUSE:Leap 15.0) 68.1.1-lp150.3.51.1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 4.7 · v3.1—No exploit Fix available
Published
Jul 23, 2019
Updated
Jun 16, 2026
EPSS
1.1% · 65th percentile

Report tools

JSON

Action score

18

Monitor

Low priority for now.

CVSS
18 / 40 · 4.7 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2019-11728

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillafirefox
opensuseleap

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla firefoxbefore 68.0
  • opensuse leap15.0
  • opensuse leap15.1

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla Firefox

    • unspecified and later · before 68affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
openSUSE:Leap 15.0enigmailbefore 2.1.2-lp150.34.12.1.2-lp150.34.1
openSUSE:Leap 15.0MozillaFirefoxbefore 68.1.0-lp150.3.66.168.1.0-lp150.3.66.1
openSUSE:Leap 15.0MozillaThunderbirdbefore 68.1.1-lp150.3.51.168.1.1-lp150.3.51.1
openSUSE:Leap 15.1enigmailbefore 2.1.2-lp151.2.6.12.1.2-lp151.2.6.1
openSUSE:Leap 15.1MozillaFirefoxbefore 68.1.0-lp151.2.14.168.1.0-lp151.2.14.1
openSUSE:Leap 15.1MozillaThunderbirdbefore 68.1.1-lp151.2.13.168.1.1-lp151.2.13.1
SUSE:HPE Helion OpenStack 8MozillaFirefoxbefore 68.1.0-109.89.168.1.0-109.89.1
SUSE:HPE Helion OpenStack 8MozillaFirefox-branding-SLEbefore 68-32.8.168-32.8.1
SUSE:Linux Enterprise Module for Desktop Applications 15MozillaFirefoxbefore 68.1.0-3.54.268.1.0-3.54.2
SUSE:Linux Enterprise Module for Desktop Applications 15MozillaFirefox-branding-SLEbefore 68-4.8.568-4.8.5
SUSE:Linux Enterprise Workstation Extension 15MozillaThunderbirdbefore 68.1.1-3.51.168.1.1-3.51.1

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypassKEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2019-11725Jul 23, 2019 · When a user navigates to site marked as unsafe by the Safebrowsing API, warning messages are displayed and navigation is interrupted but res
    26Monitor
  • ← EarlierCVE-2019-11727Jul 23, 2019 · A vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when
    22Monitor
  • Later →CVE-2019-11729Jul 23, 2019 · Empty or malformed p256-ECDH public keys may trigger a segmentation fault due values being improperly sanitized before being copied into mem
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
opensuse:enigmail2.1.2-lp150.34.1 · openSUSE:Leap 15.0Package registry (OSV)
opensuse:MozillaFirefox68.1.0-lp151.2.14.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:MozillaThunderbird68.1.1-lp150.3.51.1 · openSUSE:Leap 15.0Package registry (OSV)
suse:MozillaFirefox68.1.0-3.54.2 · SUSE:Linux Enterprise Module for Desktop Applications 15Package registry (OSV)
suse:MozillaFirefox-branding-SLE68-4.8.5 · SUSE:Linux Enterprise Module for Desktop Applications 15Package registry (OSV)
suse:MozillaThunderbird68.1.1-3.51.1 · SUSE:Linux Enterprise Workstation Extension 15Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none

Impact can extend beyond the vulnerable component (scope changes).

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Changed
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-668 · Exposure of Resource to Wrong Sphere

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (6 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records