CVE-2019-11707

CRITICALNVD 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 38%CVSS: 8.8Exploit: cisa kev · ssvc active · Exploit-DB (verified) · epss top5pct · public exploitExposed: 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 PROB
38%
EPSS %ILE
98%
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
ubuntuxul-ext-lightning (1:60.7.2+build2-0ubuntu0.19.04.1) @ disco2026-09-19ubuntu
ubuntufirefox-testsuite (67.0.3+build1-0ubuntu0.18.04.1) @ bionic2026-09-19ubuntu
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.el7_62019-06-27redhat
redhatthunderbird-0:60.7.2-2.el8_02019-06-27redhat
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.

Affected Packages

(15 across 9 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.7.1esr-1—
thunderbird—1:60.7.2-1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.7.1esr-1—
thunderbird—1:60.7.2-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.7.1esr-1—
thunderbird—1:60.7.2-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—60.7.1esr-1—
thunderbird—1:60.7.2-1—
Debian:8(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 60.7.0esr-1~deb9u1 (142 versions)60.7.1esr-1~deb8u1—
thunderbird1.5-4 ... 1:60.7.1-1~deb9u1 (80 versions)1:60.7.2-1~deb8u1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 60.7.1esr-1~deb8u1 (105 versions)60.7.1esr-1~deb9u1—
thunderbird1.5-4 ... 1:60.7.2-1~deb8u1 (81 versions)1:60.7.2-1~deb9u1—
Alpine:v3.10(1)
PackageVulnerable rangeFixed inDependents
mozjs60—60.7.2-r0—
Alpine:v3.11(1)
PackageVulnerable rangeFixed inDependents
mozjs60—60.7.2-r0—
Alpine:v3.12(1)
PackageVulnerable rangeFixed inDependents
mozjs60—60.7.2-r0—

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 90× in last 7d / 395× 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 1,420 total refreshes for this CVE.

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

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 ↗

Frequently asked(6)

What is CVE-2019-11707?
CVE-2019-11707 is a critical 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2019-11707

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