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CVE-2019-11707

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, an…

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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 8.8 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.5/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 8.8: +1.32
  • Fresh EPSS: 37.95%: +0.19

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 8 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

www.trendmicro.com
Press · 25 Mar 2020, 07:00 · Review, Refocus, and Recalibrate - www.trendmicro.com
Coinbase
Press · 08 Aug 2019, 07:00 · Responding to Firefox 0-days in the wild - Coinbase
Latest Hacking News - Exploits, Vulnerabilities, Tech and Tutorials
Press · 23 Jun 2019, 07:00 · Mozilla Releases Firefox 67.0.3 As It Fixes An Actively Exploited Zero-Day - Latest Hacking News - Exploits, Vulnerabilities, Tech and Tutorials
Security Affairs
Press · 20 Jun 2019, 07:00 · Tor Browser 8.5.2 fixes Firefox zero-day. Update it now! - Security Affairs
The Hacker News
Press · 20 Jun 2019, 07:00 · Tor Browser 8.5.2 Released — Update to Fix Critical Firefox Vulnerability - The Hacker News
See all 8 source documents
BleepingComputer
Press · 20 Jun 2019, 07:00 · Firefox 0-day Used in Targeted Attacks Against Cryptocurrency Firms - BleepingComputer
Forbes
Press · 19 Jun 2019, 07:00 · Mozilla Issues 'Update Now' Warning To 500 Million Firefox Users (Updated) - Forbes
BleepingComputer
Press · 18 Jun 2019, 07:00 · Mozilla Firefox 67.0.3 Patches Actively Exploited Zero-Day - BleepingComputer

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.5 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

2

Public exploit entries / repo candidates

See 1 repos with metrics
RepositoryStarsForksLanguageUpdated
CosminGGeorgescu/CVE-2019-11707-PoC00Makefile05 Feb 2026, 20:59
Public exploit evidence
Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 8.8; EPSS 38.0%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:03.858787+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
18 Jun 2019, 07:00
Published
23 Jul 2019, 13:20
Latest press mention
25 Mar 2020, 07:00
Added to the CISA KEV catalog
23 May 2022, 00:00
Score calculated
05 Nov 2026, 13:58
PoCs on GitHub
2 repositories