CVE-2019-11703

CRITICALNVD 9.89.8—Elevated

9.8

A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parser_get_next_char when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 92.3%
KEV: Not listed

Published

July 23, 2019

Last Modified

November 21, 2024

References (6)

security@mozillahttps://bugzilla.mozilla.org/show_bug.cgi?id=1553820
security@mozillahttps://security.gentoo.org/glsa/201908-20
security@mozillahttps://www.mozilla.org/security/advisories/mfsa2019-17/
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.mozilla.org/show_bug.cgi?id=1553820
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/201908-20
af854a3a-2127-422b-91ae-364da2661108https://www.mozilla.org/security/advisories/mfsa2019-17/

Patch Availability(4)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	xul-ext-lightning (1:60.7.1+build1-0ubuntu0.19.04.1) @ disco	2026-05-23	ubuntu
redhat	thunderbird-0:60.7.2-2.el8_0	2019-06-27	redhat
redhat	thunderbird-0:60.7.2-2.el6_10	2019-06-27	redhat
redhat	thunderbird-0:60.7.2-2.el7_6	2019-06-27	redhat

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.

Weakness Classification(2)

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

All Vendor Advisories

(4)

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 11× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 06:08 UTCepss_batch
2026-06-05 06:08 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-04 13:10 UTCepss_batch
2026-06-02 20:11 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-06-01 13:50 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 22:29 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-31 00:14 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-27 13:38 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-23 03:04 UTCEG score recompute
2026-05-23 03:04 UTCVendor advisory

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-47003
First seen Jun 17, 2019
Thunderbird ESR < 60.7.XXX - 'parser_get_next_char' Heap-Based Buffer Overflow
Open source ↗

Frequently asked(5)

What is CVE-2019-11703?

CVE-2019-11703 is a critical vulnerability published on July 23, 2019. A flaw in Thunderbird's implementation of iCal causes a heap buffer overflow in parsergetnext_char when processing certain email messages, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 60.7.1.

When was CVE-2019-11703 disclosed?

CVE-2019-11703 was first published in the National Vulnerability Database on July 23, 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-2019-11703 actively exploited?

CVE-2019-11703 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 92.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2019-11703?

CVE-2019-11703 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2019-11703?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2019-11703, 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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CVE-2019-11703

Published

Last Modified

References (6)

Patch Availability(4)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-11703?

Same vendor

Same CWE

CVE-2019-11703

📅 Published

🔄 Last Modified

🔗 References (6)

Patch Availability(4)

Weakness Classification(2)

All Vendor Advisories

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2019-11703?

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References (6)

Frequently asked(5)

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