CVE-2019-11705
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.
Does this matter?
A public exploit is published in Exploit-DB and the impact is critical, while EPSS rates exploitation at 9.9%. Anyone can run this; patch or mitigate before the next change window and check exposed instances for signs of use.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 9.90% probability · 96th percentile
- Public exploits
- 1 in Exploit-DB · first 17 June 2019
- CISA KEV
- Not listed
- Weakness
- CWE-787
- Affected
- mozilla/thunderbird
- Source
- security@mozilla.org
EPSS 9.9% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
Public exploits (1)
Entries in Exploit-DB that cite this CVE. Links go to the Exploit-DB page and to the file in the public repository; nothing is hosted here. A verified tick means the Exploit-DB team confirmed the exploit works against the stated version.
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.