What’s Vulnerable › Vulnerabilities

CVE-2019-9810

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 27.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-04-26 · updated 2026-06-17
• Weakness: CWE-119

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.

Affected products

• Mozilla Firefox: before 60.6.1; before 66.0.1 — fixed in 60.6.1, 66.0.1
• Mozilla Thunderbird: before 60.6.1 — fixed in 60.6.1
• Red Hat Enterprise Linux: 8.0
• RedHat Enterprise Linux Eus: 8.1, 8.2, 8.4
• RedHat Enterprise Linux Server Aus: 8.2, 8.4
• RedHat Enterprise Linux Server Tus: 8.2, 8.4

How to fix

Upgrade to a fixed version: Mozilla Firefox 60.6.1, 66.0.1; Mozilla Thunderbird 60.6.1. Check the vendor advisory for mitigations.

References

• http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html
• https://access.redhat.com/errata/RHSA-2019:0966
• https://access.redhat.com/errata/RHSA-2019:1144
• https://bugzilla.mozilla.org/show_bug.cgi?id=1537924
• https://www.mozilla.org/security/advisories/mfsa2019-09/
• https://www.mozilla.org/security/advisories/mfsa2019-10/
• https://www.mozilla.org/security/advisories/mfsa2019-12/
• http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html
• https://access.redhat.com/errata/RHSA-2019:0966
• https://access.redhat.com/errata/RHSA-2019:1144
• https://bugzilla.mozilla.org/show_bug.cgi?id=1537924
• https://www.mozilla.org/security/advisories/mfsa2019-09/

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