TI-2019-07187 Aliases CVE-2019-9801 GHSA-cr8h-fffv-pv55

Improper input validation in Mozilla Thunderbird

LOW 27CWE-20Published 2019-04-26 · Updated 2024-08-04

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: None · Low · None
Fix status: Fixed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA.

Summary

Firefox will accept any registered Program ID as an external protocol handler and offer to launch this local application when given a matching URL on Windows operating systems. This should only happen if the program has specifically registered itself as a "URL Handler" in the Windows registry. *Note: This issue only affects Windows operating systems. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

Why it matters now

EPSS 0.0131 70th percentileScored 2026-11-07

Fix Fixed Thunderbird (Mozilla): 60.6Firefox ESR (Mozilla): 60.6+1 more product

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mozilla	Thunderbird	before 60.6	60.6	Patch available	CNA
Mozilla	Firefox ESR	before 60.6	60.6	Patch available	CNA
Mozilla	Firefox	before 66	66	Patch available	CNA

Thunderbird VendorMozilla Affected before 60.6 Fixed in 60.6 Patch available CNA
Firefox ESR VendorMozilla Affected before 60.6 Fixed in 60.6 Patch available CNA
Firefox VendorMozilla Affected before 66 Fixed in 66 Patch available CNA

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::::	before 66.0	Vulnerable	Mozilla
cpe:2.3:a:mozilla:firefox_esr::::::::	before 60.6	Vulnerable	Mozilla
cpe:2.3:a:mozilla:thunderbird::::::::	before 60.6	Vulnerable	Mozilla
cpe:2.3:o:microsoft:windows:-:::::::*	not specified by NVD	Running on	Microsoft

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 66.0 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 60.6 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 60.6 Vulnerable ·Mozilla
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft

Remediation

Fix · CNA Thunderbird (Mozilla) Fixed in 60.6
Fix · CNA Firefox ESR (Mozilla) Fixed in 60.6
Fix · CNA Firefox (Mozilla) Fixed in 66

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2019-04-26
Mozilla Firefox 66
21 records Highest priority Priority MEDIUM 10 MEDIUM, 11 LOW
Other records, highest priority first
- TI-2019-07177 Type confusion in Mozilla ThunderbirdPriority MEDIUM 61
- TI-2019-07178 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 57
- TI-2019-07190 OS command injection in Mozilla FirefoxPriority MEDIUM 46
Show all 21 records →
Release · 2019-04-26
Mozilla Firefox ESR, Thunderbird 60.6
9 records Highest priority Priority MEDIUM 7 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2019-07177 Type confusion in Mozilla ThunderbirdPriority MEDIUM 61
- TI-2019-07178 Out-of-bounds write in Mozilla ThunderbirdPriority MEDIUM 57
- TI-2019-07182 Use after free in Mozilla ThunderbirdPriority MEDIUM 46
Show all 9 records →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 2 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7

Timeline

2026-10-02 Threatist record created from CVE-2019-9801
2026-10-03 Alias added: GHSA-cr8h-fffv-pv55

References

Advisory 4

TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8

See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences