CVE-2019-11757

HIGHNVD 8.88.8—
EchelonGraph scoreMEDIUM confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: None knownExposed: 0

A fix is available — apply it.

When following the value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

CVSS v3
8.8
EG Score
8.8(medium)
EG Risk
45(Track)
EG Risk 45/100SSVC: Track

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
Severity88% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
69%
KEV
Not listed

Published

January 8, 2020

Last Modified

November 21, 2024

Advisory Details (5)

Auto-updated Aug 17, 2026
No patch confirmed yet.
generic

Security vulnerabilities fixed in - Firefox ESR 68.2 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-33/
generic

Mozilla Thunderbird: Multiple vulnerabilities (GLSA 202003-10) — Gentoo security

https://security.gentoo.org/glsa/202003-10
generic

1577107 - (CVE-2019-11757) Use After Free in IndexedDB

https://bugzilla.mozilla.org/show_bug.cgi?id=1577107
generic

Security vulnerabilities fixed in - Thunderbird 68.2 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-35/
generic

Security vulnerabilities fixed in - Firefox 70 — Mozilla

https://www.mozilla.org/security/advisories/mfsa2019-34/

Patch Availability(9)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntufirefox-mozsymbols (70.0+build2-0ubuntu0.16.04.1) @ xenial2026-05-27ubuntu
ubuntuxul-ext-lightning (1:68.7.0+build1-0ubuntu0.16.04.2) @ xenial2026-05-27ubuntu
ubuntuxul-ext-lightning (1:68.2.1+build1-0ubuntu0.19.10.1) @ eoan2026-05-27ubuntu
redhatthunderbird-0:68.2.0-2.el6_102019-11-06redhat
redhatfirefox-0:68.2.0-4.el6_102019-10-31redhat
redhatthunderbird-0:68.2.0-1.el7_72019-10-29redhat
redhatthunderbird-0:68.2.0-1.el8_02019-10-29redhat
redhatfirefox-0:68.2.0-1.el7_72019-10-24redhat
redhatfirefox-0:68.2.0-2.el8_02019-10-24redhat

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

(14 across 7 ecosystems)
Debian:10(2)
PackageVulnerable rangeFixed inDependents
firefox-esr60.7.2esr-1 ... 68.2.0esr-1~deb9u2 (14 versions)68.2.0esr-1~deb10u1—
thunderbird1:60.7.2-1 ... 1:68.2.2-1~deb9u1 (19 versions)1:68.2.2-1~deb10u1—
Debian:11(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.2.0esr-1—
thunderbird—1:68.2.1-1—
Debian:12(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.2.0esr-1—
thunderbird—1:68.2.1-1—
Debian:13(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.2.0esr-1—
thunderbird—1:68.2.1-1—
Debian:14(2)
PackageVulnerable rangeFixed inDependents
firefox-esr—68.2.0esr-1—
thunderbird—1:68.2.1-1—
Debian:8(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.0.1esr-1 ... 68.1.0esr-1 (157 versions)68.2.0esr-1~deb8u1—
thunderbird1.5-4 ... 1:68.2.1-1 (99 versions)1:68.2.2-1~deb8u1—
Debian:9(2)
PackageVulnerable rangeFixed inDependents
firefox-esr45.9.0esr-1 ... 68.2.0esr-1~deb9u1 (121 versions)68.2.0esr-1~deb9u2—
thunderbird1.5-4 ... 1:68.2.2-1~deb8u1 (100 versions)1:68.2.2-1~deb9u1—

Weakness Classification(1)

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

All Vendor Advisories

(9)

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 8× in last 7d / 30× 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 125 total refreshes for this CVE.

  1. 2026-08-21 07:14 UTCOSV refresh
  2. 2026-08-20 22:51 UTCEPSS rescore
  3. 2026-08-19 17:00 UTCEPSS rescore
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  5. 2026-07-23 01:39 UTCEG score recompute
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  11. 2026-07-19 22:18 UTCOSV refresh
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  25. 2026-07-09 19:06 UTCEPSS rescore
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  65. 2026-06-13 22:58 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2019-11757?
CVE-2019-11757 is a high vulnerability published on January 8, 2020. When following the value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.
When was CVE-2019-11757 disclosed?
CVE-2019-11757 was first published in the National Vulnerability Database on January 8, 2020, 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-2019-11757 actively exploited?
CVE-2019-11757 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 31.0% of all scored CVEs.
What is the CVSS score of CVE-2019-11757?
CVE-2019-11757 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2019-11757?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-11757, 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

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