CVE-2019-11705

Name: CVE-2019-11705
Creator: NVD / NIST
Published: 2019-07-23T14:15:15.093+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 9.90%

Last modified Jun 17, 2026

CVE-2019-11705 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 9.90% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

9.90%

95.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-787

Affected Software

Vendor	Product	Versions
Mozilla	Thunderbird	< 60.7.1

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1553808Issue Tracking, Permissions Required, Vendor Advisory
https://security.gentoo.org/glsa/201908-20Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-17/Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1553808Issue Tracking, Permissions Required, Vendor Advisory
https://security.gentoo.org/glsa/201908-20Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-17/Vendor Advisory

Timeline

Published: Jul 23, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-11705?

How severe is CVE-2019-11705?

CVE-2019-11705 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 9.90% probability of exploitation in the next 30 days.

How do I fix CVE-2019-11705?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-11705?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST