CVE-2019-11755: mozilla thunderbird
Vulnerability summary
CVE-2019-11755 is a high (CVSS 7.5) vulnerability in mozilla thunderbird. EPSS estimates a 1.29% chance of exploitation in the next 30 days, higher than 70.2% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 6Timeline
- 27-09-2019PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
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 metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
1.29%
Chance of exploitation in the next 30 days
Percentile
70%
Versus all other CVEs
30-day change
Increase +0.21 pp
From 1.07% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Mageia2 products
- thunderbird< 68.1.1-1.mga7
- thunderbird-l10n< 68.1.1-1.mga7
Debian1 product
- thunderbird< 1:68.2.1-1
Mozilla1 product
- thunderbird≥ unspecified, < 68.1.1 | < 68.1.1
Ubuntu1 product
- thunderbird< 1:68.7.0+build1-0ubuntu0.16.04.2 | < 1:68.2.1+build1-0ubuntu0.18.04.1
4 vendors · 5 products
References
19 links- bugzilla.mozilla.org/show_bug.cgi?id=1240290X Refsource MISCIssue TrackingPermissions RequiredVendor AdvisoryREPORT
