CVE-2019-11705

9.8 criticalEPSS 9.9%

Critical (9.8) in mozilla thunderbird. EPSS 9.9% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 9.9% chance of exploitation in the next 30 days; higher than 95% of CVEs (scores of 2026-10-31)
CWE: CWE-787
Published: 2019-07-23
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

mozilla:thunderbird

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

Check your stack JSON