CVE-2019-9800

Name: CVE-2019-9800
Creator: NVD / NIST
Published: 2019-07-23T14:15:16.827+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.77%

Last modified Jun 17, 2026

CVE-2019-9800 is a vulnerability of currently unknown severity. Mozilla developers and community members reported memory safety bugs present in Firefox 66, Firefox ESR 60.6, and Thunderbird 60.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. EPSS estimates a 1.77% chance of exploitation in the next 30 days.

Description

Mozilla developers and community members reported memory safety bugs present in Firefox 66, Firefox ESR 60.6, and Thunderbird 60.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 60.7, Firefox < 67, and Firefox ESR < 60.7.

Metrics

EPSS Probability

1.77%

75.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 67.0
Mozilla	Firefox Esr	< 60.7
Mozilla	Thunderbird	< 60.7

References

https://bugzilla.mozilla.org/buglist.cgi?bug_id=1540166%2C1534593%2C1546327%2C1540136%2C1538736%2C1538042%2C1535612%2C1499719%2C1499108%2C1538619%2C1535194%2C1516325%2C1542324%2C1542097%2C1532465%2C1533554%2C1541580Permissions Required
https://www.mozilla.org/security/advisories/mfsa2019-13/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-14/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-15/Vendor Advisory
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1540166%2C1534593%2C1546327%2C1540136%2C1538736%2C1538042%2C1535612%2C1499719%2C1499108%2C1538619%2C1535194%2C1516325%2C1542324%2C1542097%2C1532465%2C1533554%2C1541580Permissions Required
https://www.mozilla.org/security/advisories/mfsa2019-13/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-14/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-15/Vendor Advisory

Timeline

Published: Jul 23, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-9800?

How severe is CVE-2019-9800?

Severity scoring for CVE-2019-9800 is pending analysis. The EPSS model estimates a 1.77% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9800?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-9800?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST