CVE-2019-9810

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 30%CVSS: 8.8Exploit: Elevated riskExposed: 0

A fix is available — apply it.

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.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity88% × 45%
Exploitation40% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
30%
EPSS %ILE
98%
KEV
Not listed

Published

April 26, 2019

Last Modified

November 25, 2025

Advisory Details (7)

Auto-updated Aug 10, 2026
Patch available. Sources: redhat.
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2019:1144
redhat Patch Available

Affected: Red Hat Enterprise Linux 8.

https://access.redhat.com/errata/RHSA-2019:0966
generic

Locked Out | Packet Storm

http://packetstormsecurity.com/files/155592/Mozilla-Firefox-Windows-64-Bit-Chain-Exploit.html
generic

Security vulnerabilities fixed in Thunderbird 60.6.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-12/
generic

Security vulnerabilities fixed in Firefox 60.6.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-10/
generic

Security vulnerabilities fixed in Firefox 66.0.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-09/
generic

1537924 - (CVE-2019-9810) ZDI-CAN-8368 IonMonkey MArraySlice has incorrect alias information

https://bugzilla.mozilla.org/show_bug.cgi?id=1537924

Vendor Advisories for CVE-2019-9810(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuxul-ext-lightning (1:60.6.1+build2-0ubuntu0.18.10.1) @ cosmic2026-05-27ubuntu
ubuntufirefox-testsuite (66.0.1+build1-0ubuntu0.16.04.1) @ xenial2026-05-27ubuntu
redhatthunderbird-0:60.6.1-1.el82019-05-13redhat
redhatfirefox-0:60.6.1-1.el82019-05-07redhat
redhatthunderbird-0:60.6.1-1.el7_62019-03-28redhat
redhatthunderbird-0:60.6.1-1.el6_102019-03-28redhat
redhatfirefox-0:60.6.1-1.el7_62019-03-27redhat
redhatfirefox-0:60.6.1-1.el6_102019-03-27redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 6 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.6.1esr-1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.6.1esr-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.6.1esr-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.6.1esr-1—
Debian:8(1)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 60.6.0esr-1~deb9u1 (131 versions)60.6.1esr-1~deb8u1—
Debian:9(1)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 60.6.1esr-1~deb8u1 (94 versions)60.6.1esr-1~deb9u1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(4)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 6× in last 7d / 22× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 123 total refreshes for this CVE.

  1. 2026-09-18 19:23 UTCEPSS rescore
  2. 2026-09-17 19:22 UTCEPSS rescore
  3. 2026-09-16 14:04 UTCEPSS rescore
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  7. 2026-09-11 14:48 UTCEPSS rescore
  8. 2026-09-11 09:32 UTCEPSS rescore
  9. 2026-09-08 11:58 UTCOSV refresh
  10. 2026-09-06 13:44 UTCEPSS rescore
  11. 2026-09-05 15:24 UTCEPSS rescore
  12. 2026-09-04 13:56 UTCEPSS rescore
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  21. 2026-08-21 22:44 UTCOSV refresh
  22. 2026-08-20 22:51 UTCEPSS rescore
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  24. 2026-08-18 13:44 UTCEPSS rescore
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  1. 2026-08-16 02:11 UTCEPSS rescore
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  5. 2026-08-08 16:33 UTCEPSS rescore
  6. 2026-08-07 16:23 UTCEPSS rescore
  7. 2026-08-06 13:43 UTCEPSS rescore
  8. 2026-08-06 04:54 UTCOSV refresh
  9. 2026-08-05 19:14 UTCEPSS rescore
  10. 2026-08-04 15:06 UTCEPSS rescore
  11. 2026-08-04 10:34 UTCEPSS rescore
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  17. 2026-07-26 14:51 UTCEPSS rescore
  18. 2026-07-25 14:14 UTCEPSS rescore
  19. 2026-07-24 14:14 UTCEPSS rescore
  20. 2026-07-23 14:15 UTCEPSS rescore
  21. 2026-07-23 14:15 UTCEPSS rescore
  22. 2026-07-23 01:47 UTCEG score recompute
  23. 2026-07-22 22:30 UTCEG score recompute
  24. 2026-07-22 14:05 UTCEPSS rescore
  25. 2026-07-21 15:22 UTCEPSS rescore
  26. 2026-07-21 15:22 UTCEPSS rescore
  27. 2026-07-20 17:04 UTCEPSS rescore
  28. 2026-07-20 17:04 UTCOSV refresh
  29. 2026-07-19 14:28 UTCEPSS rescore
  30. 2026-07-19 14:28 UTCEPSS rescore
  31. 2026-07-19 02:26 UTCEPSS rescore
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  40. 2026-07-12 05:44 UTCEPSS rescore
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  42. 2026-07-09 19:06 UTCEPSS rescore
  43. 2026-07-07 13:43 UTCEPSS rescore
  44. 2026-07-06 16:25 UTCEPSS rescore
  45. 2026-07-06 16:25 UTCEPSS rescore
  46. 2026-07-04 06:28 UTCEPSS rescore
  47. 2026-07-03 12:26 UTCOSV refresh
  48. 2026-07-01 15:03 UTCEPSS rescore
  49. 2026-07-01 15:03 UTCEPSS rescore
  50. 2026-06-28 14:05 UTCEPSS rescore
  51. 2026-06-28 04:54 UTCEPSS rescore
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  53. 2026-06-27 03:06 UTCEPSS rescore
  54. 2026-06-25 13:47 UTCEPSS rescore
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  58. 2026-06-23 21:31 UTCEPSS rescore
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  60. 2026-06-21 01:57 UTCEPSS rescore
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  62. 2026-06-18 17:50 UTCEPSS rescore
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  64. 2026-06-17 17:50 UTCEPSS rescore
  65. 2026-06-16 17:50 UTCEPSS rescore
  66. 2026-06-15 17:46 UTCEPSS rescore
  67. 2026-06-15 02:43 UTCOSV refresh
  68. 2026-06-14 23:15 UTCEPSS rescore
  69. 2026-06-14 23:15 UTCEPSS rescore
  70. 2026-06-12 23:09 UTCEPSS rescore
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  72. 2026-06-10 22:16 UTCEPSS rescore
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  74. 2026-06-10 13:19 UTCEPSS rescore
  75. 2026-06-08 14:15 UTCEPSS rescore

Publicly available exploits

(4 references)

Working exploit code is in the public domain (2 GitHub PoCs) (2 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-47752
    First seen Dec 7, 2019

    Mozilla FireFox (Windows 10 x64) - Full Chain Client Side Attack

    Open source ↗
  • GitHub PoC0vercl0k/CVE-2019-9810
    First seen May 5, 2019

    Exploit for CVE-2019-9810 Firefox on Windows 64-bit.

    Open source ↗
  • Exploit-DBEDB-46605
    First seen Mar 26, 2019

    Firefox < 66.0.1 - 'Array.prototype.slice' Buffer Overflow

    Open source ↗
  • GitHub PoCxuechiyaobai/CVE-2019-9810-PoC
    First seen Mar 25, 2019

    Array.prototype.slice wrong alias information.

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2019-9810?
CVE-2019-9810 is a high vulnerability published on April 26, 2019. 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.
When was CVE-2019-9810 disclosed?
CVE-2019-9810 was first published in the National Vulnerability Database on April 26, 2019, with the most recent update on November 25, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-9810 actively exploited?
CVE-2019-9810 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 30% probability of exploitation in the next 30 days, which ranks it in the top 1.9% of all scored CVEs.
What is the CVSS score of CVE-2019-9810?
CVE-2019-9810 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2019-9810?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-9810, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-9810

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