Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

CVE record · CVE-2019-17026

Type confusion in Mozilla Firefox ESR and others

CVSS 8.8 HighCriticalIn CISA KEVEPSS 0.46 · 98th percentile

Critical, because:

  • In CISA’s KEV catalogue since 3 Nov 2021: it is known to be exploited.
  • CVSS score 8.8 (7.0 or more) and EPSS 0.46 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: mozilla) at 2 Mar 2020, 04:05 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
Mozilla Firefox ESR
  • affected unspecified to before 68.4.1 custom
Mozilla Thunderbird
  • affected unspecified to before 68.4.1 custom
Mozilla Firefox
  • affected unspecified to before 72.0.1 custom
Identifiers
CVE-2019-17026
CNA
mozilla
Weakness (CWE)
CWE-843
Tags
Published
2 Mar 2020
Updated
21 Oct 2025

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.8 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H ADP (CISA-ADP)
  • CISA KEV Listed since 3 Nov 2021: known to be exploited.
  • EPSS 0.46, the 98th percentile, on 8 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 2 Mar 2020. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.