What’s Vulnerable › Vulnerabilities

CVE-2019-11705

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 9.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2019-07-23 · updated 2026-06-17
• Weakness: CWE-787

Description

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

Affected products

• Mozilla Thunderbird: before 60.7.1 — fixed in 60.7.1

How to fix

Upgrade to a fixed version: Mozilla Thunderbird 60.7.1. Check the vendor advisory for mitigations.

References

• https://bugzilla.mozilla.org/show_bug.cgi?id=1553808
• https://security.gentoo.org/glsa/201908-20
• https://www.mozilla.org/security/advisories/mfsa2019-17/
• https://bugzilla.mozilla.org/show_bug.cgi?id=1553808
• https://security.gentoo.org/glsa/201908-20
• https://www.mozilla.org/security/advisories/mfsa2019-17/

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