CVE-2019-11755
This vulnerability affects Thunderbird < 68.1.1.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.29%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A crafted S/MIME message consisting of an inner encryption layer and an outer SignedData layer was shown as having a valid digital signature, although the signer might have had no access to the contents of the encrypted message, and might have stripped a different signature from the encrypted message. Previous versions had only suppressed showing a digital signature for messages with an outer multipart/signed layer. This vulnerability affects Thunderbird < 68.1.1.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.29% probability · 70th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-347
- Affected
- mozilla/thunderbird
- Source
- security@mozilla.org
EPSS 1.3% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1240290Issue Tracking, Permissions Required, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2019/11/msg00017.html
- https://seclists.org/bugtraq/2019/Nov/24
- https://usn.ubuntu.com/4202-1/
- https://usn.ubuntu.com/4335-1/
- https://www.debian.org/security/2019/dsa-4571
- https://www.mozilla.org/security/advisories/mfsa2019-32/Vendor Advisory
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=1240290Issue Tracking, Permissions Required, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2019/11/msg00017.html
- https://seclists.org/bugtraq/2019/Nov/24
- https://usn.ubuntu.com/4202-1/
- https://usn.ubuntu.com/4335-1/
- https://www.debian.org/security/2019/dsa-4571
- https://www.mozilla.org/security/advisories/mfsa2019-32/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.