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Vulnerability details: VCID-g3cr-g9q8-k7dr
Vulnerability ID VCID-g3cr-g9q8-k7dr
Aliases CVE-2019-11755
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 6.8
Risk 3.4
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-290 Authentication Bypass by Spoofing
CWE-347 Improper Verification of Cryptographic Signature
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11755.json
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
epss 0.00406 https://api.first.org/data/v1/epss?cve=CVE-2019-11755
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2019-11755
cvssv3.1 7.5 https://nvd.nist.gov/vuln/detail/CVE-2019-11755
generic_textual none https://www.mozilla.org/en-US/security/advisories/mfsa2019-32
Reference id Reference type URL
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11755.json
https://api.first.org/data/v1/epss?cve=CVE-2019-11755
https://bugzilla.mozilla.org/show_bug.cgi?id=1240290
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11755
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11757
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11759
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11760
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11761
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11762
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11763
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11764
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15903
https://www.mozilla.org/security/advisories/mfsa2019-32/
1762818 https://bugzilla.redhat.com/show_bug.cgi?id=1762818
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
CVE-2019-11755 https://nvd.nist.gov/vuln/detail/CVE-2019-11755
mfsa2019-32 https://www.mozilla.org/en-US/security/advisories/mfsa2019-32
USN-4202-1 https://usn.ubuntu.com/4202-1/
USN-4335-1 https://usn.ubuntu.com/4335-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-11755.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:N/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11755
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2019-11755
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.60251
EPSS Score 0.00406
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:10:02.289555+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2019/mfsa2019-32.yml 37.0.0