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CRITICAL

CVE-2019-11704

CVSS v3

9.8

CRITICAL

EPSS Score

10.5 %

exploit probability, as of 2026-10-19

CISA KEV

No

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • CVE-2019-11704 Red Hat Product Security62 products fixed · 2 known affected

    libical: Heap buffer overflow in icalmemory_strdup_and_dequote function in icalvalue.c

    libical-devel as a component of Red Hat Enterprise Linux 6 · libical.src as a component of Red Hat Enterprise Linux 6

  • RHSA-2019:1626 Red Hat Product Security16 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2019:1624 Red Hat Product Security19 products fixed

    Red Hat Security Advisory: thunderbird security update

  • RHSA-2019:1623 Red Hat Product Security7 products fixed

    Red Hat Security Advisory: thunderbird security update

Full record on NVD

Description

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

Technical details

Published
2019-07-23
Exploit-DB
EDB-47002

Frequently asked questions

What is CVE-2019-11704?

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

Is CVE-2019-11704 actively exploited?

Active exploitation of CVE-2019-11704 has not been confirmed. Its EPSS score was 10.5% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2019-11704?

CVE-2019-11704 has a CVSS v3 base score of 9.8 (CRITICAL severity).

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