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Public proof of conceptFix available

CVE-2019-9810

A public proof of concept exists; no exploitation attested.

  • Published2019-04-26
  • WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2019-03-26Exploit-DB entryExploit-DB
  2. 2019-04-2617:29CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2019-9810?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2019-9810?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Redhat enterprise linux eus
BranchAffectedFixed in
8.1= 8.1no fix published
8.2= 8.2no fix published
8.4= 8.4no fix published
Mozilla firefox
BranchAffectedFixed in
66.0< 66.0.166.0.1
60.6< 60.6.160.6.1
Redhat enterprise linux server aus
BranchAffectedFixed in
8.2= 8.2no fix published
8.4= 8.4no fix published

3 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxUbuntu:18.04:LTSall versions · fixed in 66.0.1+build1-0ubuntu0.18.04.1
  • firefoxUbuntu:16.04:LTSall versions · fixed in 66.0.1+build1-0ubuntu0.16.04.1
  • firefoxUbuntu:14.04:LTSall versions · fixed in 66.0.1+build1-0ubuntu0.14.04.1
  • firefoxRed Hat:enterprise_linux:8::appstreamall versions · fixed in 0:60.6.1-1.el8and 5 other packages
  • firefoxRed Hat:enterprise_linux:7::workstationall versions · fixed in 0:60.6.1-1.el7_6and 3 other packages
  • firefoxRed Hat:enterprise_linux:7::serverall versions · fixed in 0:60.6.1-1.el7_6and 3 other packages
  • firefoxRed Hat:enterprise_linux:7::clientall versions · fixed in 0:60.6.1-1.el7_6and 3 other packages
  • firefoxRed Hat:enterprise_linux:6::workstationall versions · fixed in 0:60.6.1-1.el6_10and 3 other packages

55 more package ranges on OSV.dev

Vendor advisories

  • CVE-2019-9810 Red Hat Product Security229 products fixed

    Mozilla: IonMonkey MArraySlice has incorrect alias information

  • RHSA-2019:1144 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2019:0966 Red Hat Product Security13 products fixed

    Red Hat Security Advisory: firefox security update

  • RHSA-2019:0681 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2019:0680 Red Hat Product Security19 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2019:0672 Red Hat Product Security30 products fixed

    Red Hat Security Advisory: firefox security update

1 more advisory

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2019:1144 · 7 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
  2. Vendor fix Red Hat Product Security RHSA-2019:0966 · 13 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 After installing the update, Firefox must be restarted for the changes to take effect.

Advisories and patches

Detection

read 2026-11-02 22:42 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
EDB-46605EDB-47752
Exploit-DB
Proof-of-concept repositories
2 repositories, unverifiedxuechiyaobai/CVE-2019-9810-PoC0vercl0k/CVE-2019-9810
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.18.8read 2026-10-23
  • NVDCVSS 2.06.8read 2026-10-23
  • NVDweakness (CWE)CWE-119read 2026-10-23
  • FIRST EPSSEPSS score27.2 %read 2026-11-02
  • PoC-in-GitHubproof of concept2read 2026-11-02
  • Exploit-DBdetectionread 2026-11-02
  • OSVaffected packages—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2019-04-26
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2019-9810?

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.

Is CVE-2019-9810 actively exploited?

Active exploitation of CVE-2019-9810 has not been confirmed. Its EPSS score was 27.2% on 2026-11-03, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-9810?

CVE-2019-9810 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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