Search for vulnerabilities
Vulnerability details: VCID-kvsf-hz19-wfcc
Vulnerability ID VCID-kvsf-hz19-wfcc
Aliases CVE-2025-3522
Summary Thunderbird processes the X-Mozilla-External-Attachment-URL header to handle attachments which can be hosted externally. When an email is opened, Thunderbird accesses the specified URL to determine file size, and navigates to it when the user clicks the attachment. Because the URL is not validated or sanitized, it can reference internal resources like chrome:// or SMB share file:// links, potentially leading to hashed Windows credential leakage and opening the door to more serious security issues.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-1220 Insufficient Granularity of Access Control
System Score Found at
cvssv3 7.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-3522.json
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00033 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00045 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00049 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00049 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
epss 0.00054 https://api.first.org/data/v1/epss?cve=CVE-2025-3522
cvssv3.1 6.3 https://bugzilla.mozilla.org/show_bug.cgi?id=1955372
ssvc Track https://bugzilla.mozilla.org/show_bug.cgi?id=1955372
cvssv3.1 7.4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-26
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-27
cvssv3.1 6.3 https://www.mozilla.org/security/advisories/mfsa2025-26/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-26/
cvssv3.1 6.3 https://www.mozilla.org/security/advisories/mfsa2025-27/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-27/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-3522.json
https://api.first.org/data/v1/epss?cve=CVE-2025-3522
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-3522
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2359793 https://bugzilla.redhat.com/show_bug.cgi?id=2359793
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-2025-3522 https://nvd.nist.gov/vuln/detail/CVE-2025-3522
mfsa2025-26 https://www.mozilla.org/en-US/security/advisories/mfsa2025-26
mfsa2025-26 https://www.mozilla.org/security/advisories/mfsa2025-26/
mfsa2025-27 https://www.mozilla.org/en-US/security/advisories/mfsa2025-27
mfsa2025-27 https://www.mozilla.org/security/advisories/mfsa2025-27/
RHSA-2025:4229 https://access.redhat.com/errata/RHSA-2025:4229
RHSA-2025:4389 https://access.redhat.com/errata/RHSA-2025:4389
RHSA-2025:4512 https://access.redhat.com/errata/RHSA-2025:4512
RHSA-2025:4513 https://access.redhat.com/errata/RHSA-2025:4513
RHSA-2025:4514 https://access.redhat.com/errata/RHSA-2025:4514
RHSA-2025:4617 https://access.redhat.com/errata/RHSA-2025:4617
RHSA-2025:4649 https://access.redhat.com/errata/RHSA-2025:4649
RHSA-2025:4654 https://access.redhat.com/errata/RHSA-2025:4654
RHSA-2025:4665 https://access.redhat.com/errata/RHSA-2025:4665
RHSA-2025:7435 https://access.redhat.com/errata/RHSA-2025:7435
RHSA-2025:7507 https://access.redhat.com/errata/RHSA-2025:7507
show_bug.cgi?id=1955372 https://bugzilla.mozilla.org/show_bug.cgi?id=1955372
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-3522.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: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1955372
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-15T18:49:37Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1955372
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L Found at https://www.mozilla.org/security/advisories/mfsa2025-26/
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-15T18:49:37Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-26/
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L Found at https://www.mozilla.org/security/advisories/mfsa2025-27/
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: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-04-15T18:49:37Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-27/
Exploit Prediction Scoring System (EPSS)
Percentile 0.07104
EPSS Score 0.0003
Published At April 16, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-04-15T18:46:13.345923+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2025/mfsa2025-27.yml 36.0.0