CVE-2019-9810

Name: CVE-2019-9810
Creator: NVD / NIST
Published: 2019-04-26T17:29:04.007+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8.8/10EPSS 29.51%

Last modified Jun 17, 2026

CVE-2019-9810 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. Incorrect alias information in IonMonkey JIT compiler for Array.prototype.slice method may lead to missing bounds check and a buffer overflow. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.. EPSS estimates a 29.51% chance of exploitation in the next 30 days.

Description

Incorrect alias information in IonMonkey JIT compiler for Array.prototype.slice method may lead to missing bounds check and a buffer overflow. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.

Metrics

CVSS 3.1

8.8/10

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

EPSS Probability

29.51%

97.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-119

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 60.6.1
Mozilla	Firefox	< 66.0.1
Mozilla	Thunderbird	< 60.6.1
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux Eus	8.1
Redhat	Enterprise Linux Eus	8.2
Redhat	Enterprise Linux Eus	8.4
Redhat	Enterprise Linux Server Aus	8.2
Redhat	Enterprise Linux Server Aus	8.4
Redhat	Enterprise Linux Server Tus	8.2
Redhat	Enterprise Linux Server Tus	8.4

References

http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.htmlExploit, Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2019:0966Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1144Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1537924Exploit, Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-09/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-10/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-12/Vendor Advisory
http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.htmlExploit, Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2019:0966Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:1144Third Party Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1537924Exploit, Issue Tracking, Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-09/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-10/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-12/Vendor Advisory

Timeline

Published: Apr 26, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-9810?

How severe is CVE-2019-9810?

CVE-2019-9810 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 29.51% probability of exploitation in the next 30 days.

How do I fix CVE-2019-9810?

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-2019-9810?

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

Scan your code now

Source: NVD / NIST