Mozilla developers and community members reported memory safety bugs present in Firefox 68. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 69.
CVE-2019-11734
CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence
This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 37% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
- High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0
A fix is available — apply it.
- CVSS v3
- 9.8
- EG Score
- 9.8(medium)
- EPSS
- 67.0%
- KEV
- Not listed
Published
September 27, 2019
Last Modified
November 21, 2024
Advisory Details (2)
Auto-updated May 27, 2026No patch confirmed yet.
generic
Security vulnerabilities fixed in Firefox 69 — Mozilla
https://www.mozilla.org/security/advisories/mfsa2019-25/generic
Client Challenge
https://bugzilla.mozilla.org/buglist.cgi?bug_id=1352875%2C1536227%2C1557208%2C1560641Frequently asked(5)
What is CVE-2019-11734?
CVE-2019-11734 is a critical vulnerability published on September 27, 2019. Mozilla developers and community members reported memory safety bugs present in Firefox 68. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Firefox < 69.
When was CVE-2019-11734 disclosed?
CVE-2019-11734 was first published in the National Vulnerability Database on September 27, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-11734 actively exploited?
CVE-2019-11734 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 67.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2019-11734?
CVE-2019-11734 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-11734?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-11734, 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
Explore the affected products and dependency analysis for CVE-2019-11734
Is Your Infrastructure Affected by CVE-2019-11734?
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