CVE-2019-9792

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-24. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Exploit-DB (verified), epss top5pct, public exploit)
CISA-KEV: Not listedEPSS PROB: 13%CVSS: 9.8Exploit: Exploit-DB (verified) · epss top5pct · public exploitExposed services: Not assessed

A fix is available — apply it.

The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
75
EG Risk 75/100CISA SSVC

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
Severity98% × 45%
Exploitation65% × 40%
Automatability30% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
13%
EPSS %ILE
96th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

April 26, 2019

Last Modified

November 25, 2025

Advisory Details (7)

Auto-updated Oct 1, 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

Packet Storm - Human Validation

http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.html
generic

Security vulnerabilities fixed in Thunderbird 60.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-11/
generic

Security vulnerabilities fixed in Firefox ESR 60.6 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-08/
generic

Security vulnerabilities fixed in Firefox 66 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-07/
generic

1532599 - (CVE-2019-9792) Spidermonkey: IonMonkey leaks JS_OPTIMIZED_OUT magic value to script

https://bugzilla.mozilla.org/show_bug.cgi?id=1532599

Vendor Advisories for CVE-2019-9792(6)

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

Patch Availability(9)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntufirefox-testsuite (66.0+build3-0ubuntu0.18.10.1) @ cosmic2026-05-27ubuntu
ubuntuxul-ext-lightning (1:60.6.1+build2-0ubuntu0.16.04.1) @ xenial2026-05-27ubuntu
ubuntufirefox-testsuite (66.0.1+build1-0ubuntu0.14.04.1) @ trusty2026-05-27ubuntu
redhatthunderbird-0:60.6.1-1.el82019-05-13redhat
redhatfirefox-0:60.6.1-1.el82019-05-07redhat
redhatthunderbird-0:60.6.1-1.el6_102019-03-28redhat
redhatthunderbird-0:60.6.1-1.el7_62019-03-28redhat
redhatfirefox-0:60.6.0-3.el6_102019-03-20redhat
redhatfirefox-0:60.6.0-3.el7_62019-03-20redhat

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

(12 across 6 ecosystems)
Debian:11(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.6.0esr-1: fixed in 60.6.0esr-1
—
thunderbird—
  • every version up to 1:60.6.1-1: fixed in 1:60.6.1-1
—
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.6.0esr-1: fixed in 60.6.0esr-1
—
thunderbird—
  • every version up to 1:60.6.1-1: fixed in 1:60.6.1-1
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.6.0esr-1: fixed in 60.6.0esr-1
—
thunderbird—
  • every version up to 1:60.6.1-1: fixed in 1:60.6.1-1
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr—
  • every version up to 60.6.0esr-1: fixed in 60.6.0esr-1
—
thunderbird—
  • every version up to 1:60.6.1-1: fixed in 1:60.6.1-1
—
Debian:8(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.0.1esr-1 ... 60.5.1esr-1~deb9u1 (128 versions)
  • every version up to 60.6.0esr-1~deb8u1: fixed in 60.6.0esr-1~deb8u1
—
thunderbird1.5-4 ... 1:60.5.1-1~deb9u1 (71 versions)
  • every version up to 1:60.6.1-1~deb8u1: fixed in 1:60.6.1-1~deb8u1
—
Debian:9(2)
PackageVulnerable rangeFix by version rangeDependents
firefox-esr45.9.0esr-1 ... 60.6.0esr-1~deb8u1 (91 versions)
  • every version up to 60.6.0esr-1~deb9u1: fixed in 60.6.0esr-1~deb9u1
—
thunderbird1.5-4 ... 1:60.6.1-1~deb8u1 (72 versions)
  • every version up to 1:60.6.1-1~deb9u1: fixed in 1:60.6.1-1~deb9u1
—

Weakness Classification(2)

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

Additional Vendor Advisories

(3)

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 4× in last 7d / 24× 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 147 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-03 14:22 UTCEPSS rescore
  3. 2026-09-30 14:59 UTCEPSS rescore
  4. 2026-09-30 10:30 UTCEG score recompute
  5. 2026-09-28 08:02 UTCOSV refresh
  6. 2026-09-27 13:40 UTCEPSS rescore
  7. 2026-09-26 15:54 UTCEPSS rescore
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  21. 2026-09-11 09:32 UTCEPSS rescore
  22. 2026-09-08 12:04 UTCOSV refresh
  23. 2026-09-07 15:57 UTCEPSS rescore
  24. 2026-09-06 13:44 UTCEPSS rescore
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  1. 2026-09-04 13:56 UTCEPSS rescore
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  5. 2026-08-30 19:14 UTCEPSS rescore
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  7. 2026-08-28 21:37 UTCEPSS rescore
  8. 2026-08-27 14:21 UTCEPSS rescore
  9. 2026-08-26 14:42 UTCEPSS rescore
  10. 2026-08-25 13:45 UTCEPSS rescore
  11. 2026-08-21 22:44 UTCOSV refresh
  12. 2026-08-20 22:51 UTCEPSS rescore
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  23. 2026-08-06 13:43 UTCEPSS rescore
  24. 2026-08-06 04:54 UTCOSV refresh
  25. 2026-08-05 19:14 UTCEPSS rescore
  26. 2026-08-04 15:06 UTCEPSS rescore
  27. 2026-08-01 04:12 UTCEPSS rescore
  28. 2026-07-30 16:24 UTCEPSS rescore
  29. 2026-07-28 15:32 UTCEPSS rescore
  30. 2026-07-25 14:14 UTCEPSS rescore
  31. 2026-07-24 14:14 UTCEPSS rescore
  32. 2026-07-23 14:15 UTCEPSS rescore
  33. 2026-07-23 14:15 UTCEPSS rescore
  34. 2026-07-23 01:47 UTCEG score recompute
  35. 2026-07-22 22:30 UTCEG score recompute
  36. 2026-07-22 14:05 UTCEPSS rescore
  37. 2026-07-21 15:22 UTCEPSS rescore
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  39. 2026-07-20 17:04 UTCEPSS rescore
  40. 2026-07-20 17:04 UTCOSV refresh
  41. 2026-07-19 14:28 UTCEPSS rescore
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  45. 2026-07-18 10:02 UTCEPSS rescore
  46. 2026-07-16 16:59 UTCEPSS rescore
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  48. 2026-07-15 16:55 UTCEPSS rescore
  49. 2026-07-13 22:27 UTCEPSS rescore
  50. 2026-07-12 05:44 UTCEPSS rescore
  51. 2026-07-11 08:24 UTCEPSS rescore
  52. 2026-07-09 19:06 UTCEPSS rescore
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  54. 2026-07-07 13:43 UTCEPSS rescore
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  58. 2026-07-05 02:27 UTCEPSS rescore
  59. 2026-07-03 12:26 UTCOSV refresh
  60. 2026-07-01 15:03 UTCEPSS rescore
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  62. 2026-06-30 23:20 UTCEPSS rescore
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  64. 2026-06-29 14:04 UTCEPSS rescore
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  69. 2026-06-27 03:06 UTCEPSS rescore
  70. 2026-06-25 13:47 UTCEPSS rescore
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  74. 2026-06-23 21:31 UTCEPSS rescore
  75. 2026-06-23 21:31 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-46939✓ verified
    First seen May 29, 2019

    Spidermonkey - IonMonkey Leaks JS_OPTIMIZED_OUT Magic Value to Script

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2019-9792?
CVE-2019-9792 is a critical vulnerability published on April 26, 2019. The IonMonkey just-in-time (JIT) compiler can leak an internal JSOPTIMIZEDOUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash. This vulnerability affects Thunderbird <…
When was CVE-2019-9792 disclosed?
CVE-2019-9792 was first published 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-2019-9792 actively exploited?
CVE-2019-9792 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 13% probability of exploitation in the next 30 days (96th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2019-9792?
CVE-2019-9792 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-9792?
A fix for CVE-2019-9792 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2019-9792 are linked in the Vendor Advisories panel on this page.

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