CVE-2019-11707

HIGHNVD 8.89.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-05-23), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.8 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 5 sources updated this weekExploited in the wild
8.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 38%CVSS: 8.8Exploit: NoneExposed: 0

A fix is available — apply it.

A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 60.7.1, Firefox < 67.0.3, and Thunderbird < 60.7.2.

CVSS v3
8.8
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: Attend

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
Severity90% × 45%
Exploitation100% × 40%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS
98.4%
KEV
⚠ Exploited

Published

July 23, 2019

Last Modified

October 27, 2025

Advisory Details (5)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2019-11707
generic🔴 Active Exploitation

Security vulnerabilities fixed in Thunderbird 60.7.2 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-20/
generic🔴 Active Exploitation

Security vulnerabilities fixed in Firefox 67.0.3 and Firefox ESR 60.7.1 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-18/
generic

Mozilla Firefox: Multiple vulnerabilities (GLSA 201908-12) — Gentoo security

https://security.gentoo.org/glsa/201908-12
generic🔴 Active Exploitation

1544386 - (CVE-2019-11707) Spidermonkey: IonMonkey incorrectly predicts return type of Array.prototype.pop, leading to type confusions

https://bugzilla.mozilla.org/show_bug.cgi?id=1544386

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-testsuite (67.0.3+build1-0ubuntu0.19.04.1) @ disco2026-07-21ubuntu
ubuntuxul-ext-lightning (1:60.7.2+build2-0ubuntu0.16.04.1) @ xenial2026-07-21ubuntu
redhatfirefox-0:60.7.2-3.el8_02019-07-08redhat
redhatthunderbird-0:60.7.2-2.el6_102019-06-27redhat
redhatthunderbird-0:60.7.2-2.el8_02019-06-27redhat
redhatthunderbird-0:60.7.2-2.el7_62019-06-27redhat
redhatfirefox-0:60.7.2-1.el7_62019-06-25redhat
redhatfirefox-0:60.7.2-1.el6_102019-06-25redhat

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.

Weakness Classification(1)

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

All Vendor Advisories

(8)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 96× in last 7d / 387× 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 682 total refreshes for this CVE.

  1. 2026-07-23 01:39 UTCEG score recompute
  2. 2026-07-22 22:05 UTCEG score recompute
  3. 2026-07-22 22:05 UTCVendor advisory
  4. 2026-07-22 22:05 UTCGHSA enrichment
  5. 2026-07-22 19:40 UTCCISA KEV update
  6. 2026-07-22 17:45 UTCEG score recompute
  7. 2026-07-22 17:45 UTCVendor advisory
  8. 2026-07-22 17:45 UTCGHSA enrichment
  9. 2026-07-22 14:05 UTCEPSS rescore
  10. 2026-07-22 13:24 UTCVendor advisory
  11. 2026-07-22 13:24 UTCGHSA enrichment
  12. 2026-07-22 09:06 UTCVendor advisory
  13. 2026-07-22 09:06 UTCGHSA enrichment
  14. 2026-07-22 04:47 UTCVendor advisory
  15. 2026-07-22 04:47 UTCGHSA enrichment
  16. 2026-07-22 00:28 UTCVendor advisory
  17. 2026-07-22 00:28 UTCGHSA enrichment
  18. 2026-07-21 19:37 UTCEG score recompute
  19. 2026-07-21 19:37 UTCVendor advisory
  20. 2026-07-21 19:37 UTCGHSA enrichment
  21. 2026-07-21 15:22 UTCEPSS rescore
  22. 2026-07-21 15:22 UTCEPSS rescore
  23. 2026-07-21 15:16 UTCVendor advisory
  24. 2026-07-21 15:16 UTCGHSA enrichment
  25. 2026-07-21 14:37 UTCCISA KEV update
Show 75 more
  1. 2026-07-21 10:58 UTCVendor advisory
  2. 2026-07-21 10:58 UTCGHSA enrichment
  3. 2026-07-21 06:39 UTCVendor advisory
  4. 2026-07-21 06:39 UTCGHSA enrichment
  5. 2026-07-21 02:20 UTCVendor advisory
  6. 2026-07-21 02:19 UTCGHSA enrichment
  7. 2026-07-20 22:01 UTCVendor advisory
  8. 2026-07-20 22:00 UTCGHSA enrichment
  9. 2026-07-20 17:42 UTCEG score recompute
  10. 2026-07-20 17:42 UTCVendor advisory
  11. 2026-07-20 17:42 UTCGHSA enrichment
  12. 2026-07-20 17:04 UTCEPSS rescore
  13. 2026-07-20 13:23 UTCVendor advisory
  14. 2026-07-20 13:23 UTCGHSA enrichment
  15. 2026-07-20 09:05 UTCVendor advisory
  16. 2026-07-20 09:04 UTCGHSA enrichment
  17. 2026-07-20 04:45 UTCVendor advisory
  18. 2026-07-20 04:45 UTCGHSA enrichment
  19. 2026-07-20 00:27 UTCVendor advisory
  20. 2026-07-20 00:27 UTCGHSA enrichment
  21. 2026-07-19 20:08 UTCVendor advisory
  22. 2026-07-19 20:08 UTCGHSA enrichment
  23. 2026-07-19 15:47 UTCVendor advisory
  24. 2026-07-19 15:47 UTCGHSA enrichment
  25. 2026-07-19 11:29 UTCVendor advisory
  26. 2026-07-19 11:29 UTCGHSA enrichment
  27. 2026-07-19 07:10 UTCVendor advisory
  28. 2026-07-19 07:10 UTCGHSA enrichment
  29. 2026-07-19 02:51 UTCEG score recompute
  30. 2026-07-19 02:51 UTCVendor advisory
  31. 2026-07-19 02:51 UTCGHSA enrichment
  32. 2026-07-19 02:26 UTCEPSS rescore
  33. 2026-07-19 02:26 UTCEPSS rescore
  34. 2026-07-18 22:32 UTCVendor advisory
  35. 2026-07-18 22:32 UTCGHSA enrichment
  36. 2026-07-18 18:13 UTCVendor advisory
  37. 2026-07-18 18:13 UTCGHSA enrichment
  38. 2026-07-18 13:53 UTCEG score recompute
  39. 2026-07-18 13:53 UTCVendor advisory
  40. 2026-07-18 13:53 UTCGHSA enrichment
  41. 2026-07-18 10:01 UTCEPSS rescore
  42. 2026-07-18 09:34 UTCVendor advisory
  43. 2026-07-18 09:34 UTCGHSA enrichment
  44. 2026-07-18 05:15 UTCVendor advisory
  45. 2026-07-18 05:15 UTCGHSA enrichment
  46. 2026-07-18 00:56 UTCVendor advisory
  47. 2026-07-18 00:56 UTCGHSA enrichment
  48. 2026-07-17 20:37 UTCVendor advisory
  49. 2026-07-17 20:37 UTCGHSA enrichment
  50. 2026-07-17 16:18 UTCVendor advisory
  51. 2026-07-17 16:18 UTCGHSA enrichment
  52. 2026-07-17 12:00 UTCVendor advisory
  53. 2026-07-17 11:59 UTCGHSA enrichment
  54. 2026-07-17 07:40 UTCEG score recompute
  55. 2026-07-17 07:40 UTCVendor advisory
  56. 2026-07-17 07:40 UTCGHSA enrichment
  57. 2026-07-17 03:21 UTCVendor advisory
  58. 2026-07-17 03:21 UTCGHSA enrichment
  59. 2026-07-16 23:02 UTCVendor advisory
  60. 2026-07-16 23:02 UTCGHSA enrichment
  61. 2026-07-16 18:44 UTCVendor advisory
  62. 2026-07-16 18:44 UTCGHSA enrichment
  63. 2026-07-16 17:04 UTCCISA KEV update
  64. 2026-07-16 16:59 UTCEPSS rescore
  65. 2026-07-16 16:59 UTCEPSS rescore
  66. 2026-07-16 14:25 UTCVendor advisory
  67. 2026-07-16 14:25 UTCGHSA enrichment
  68. 2026-07-16 10:05 UTCVendor advisory
  69. 2026-07-16 10:05 UTCGHSA enrichment
  70. 2026-07-16 05:47 UTCVendor advisory
  71. 2026-07-16 05:47 UTCGHSA enrichment
  72. 2026-07-16 01:28 UTCVendor advisory
  73. 2026-07-16 01:28 UTCGHSA enrichment
  74. 2026-07-15 21:09 UTCVendor advisory
  75. 2026-07-15 21:09 UTCGHSA enrichment

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-50691
    First seen Feb 2, 2022

    Mozilla Firefox 67 - Array.pop JIT Type Confusion

    Open source ↗
  • GitHub PoCflabbergastedbd/cve-2019-11707
    First seen Apr 13, 2020

    https://bugs.chromium.org/p/project-zero/issues/detail?id=1820

    Open source ↗
  • GitHub PoCvigneshsrao/CVE-2019-11707
    First seen Aug 18, 2019

    Exploit code for CVE-2019-11707 on Firefox 66.0.3 running on Ubuntu

    Open source ↗
  • Exploit-DBEDB-47038✓ verified
    First seen Jun 26, 2019

    Mozilla Spidermonkey - IonMonkey 'Array.prototype.pop' Type Confusion

    Open source ↗

Related CVEs(same vendor + same CWE)

Frequently asked(6)

What is CVE-2019-11707?
CVE-2019-11707 is a high vulnerability published on July 23, 2019. A type confusion vulnerability can occur when manipulating JavaScript objects due to issues in Array.pop. This can allow for an exploitable crash. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 60.7.1, Firefox < 67.0.3, and Thunderbird <…
When was CVE-2019-11707 disclosed?
CVE-2019-11707 was first published in the National Vulnerability Database on July 23, 2019, with the most recent update on October 27, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-11707 actively exploited?
Yes. CISA added CVE-2019-11707 to the Known Exploited Vulnerabilities catalog on May 23, 2022, affecting Mozilla Firefox and Thunderbird. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2019-11707?
CVE-2019-11707 has a CVSS v3 base score of 8.8 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2019-11707?
CVE-2019-11707 affects Mozilla Firefox and Thunderbird. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2019-11707?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-11707, 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

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