CVE-2025-3877
Thunderbird Unsolicited PDF Download and Disk Filling Vulnerability
Description
Rejected reason: This CVE was marked as fixed, but due to other code landing - was not actually fixed. It was subsequently fixed in CVE-2025-5986.
INFO
Published Date :
May 14, 2025, 5:15 p.m.
Last Modified :
June 11, 2025, 1:15 p.m.
Source :
[email protected]
Remotely Exploitable :
Yes !
Impact Score :
2.5
Exploitability Score :
2.8
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-3877 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-3877 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Rejected by [email protected]
Jun. 11, 2025
Action Type Old Value New Value -
CVE Modified by [email protected]
Jun. 11, 2025
Action Type Old Value New Value Changed Description A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data (e.g. using /dev/urandom on Linux) or to leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1. Rejected reason: This CVE was marked as fixed, but due to other code landing - was not actually fixed. It was subsequently fixed in CVE-2025-5986. Removed CVSS V3.1 CISA-ADP: AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L Removed CWE CISA-ADP: CWE-200 Removed CPE Configuration OR *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions up to (excluding) 128.10.1 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions from (including) 129.0 up to (excluding) 138.0.1 Removed Reference Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=1958580 Removed Reference Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-34/ Removed Reference Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-35/ Removed Reference Type Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=1958580 Types: Permissions Required Removed Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-34/ Types: Vendor Advisory Removed Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-35/ Types: Vendor Advisory -
Initial Analysis by [email protected]
Jun. 05, 2025
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions up to (excluding) 128.10.1 *cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* versions from (including) 129.0 up to (excluding) 138.0.1 Added Reference Type Mozilla Corporation: https://bugzilla.mozilla.org/show_bug.cgi?id=1958580 Types: Permissions Required Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-34/ Types: Vendor Advisory Added Reference Type Mozilla Corporation: https://www.mozilla.org/security/advisories/mfsa2025-35/ Types: Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 15, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L Removed CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
May. 15, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N Added CWE CWE-200 -
New CVE Received by [email protected]
May. 14, 2025
Action Type Old Value New Value Added Description A crafted HTML email using mailbox:/// links can trigger automatic, unsolicited downloads of .pdf files to the user's desktop or home directory without prompting, even if auto-saving is disabled. This behavior can be abused to fill the disk with garbage data (e.g. using /dev/urandom on Linux) or to leak Windows credentials via SMB links when the email is viewed in HTML mode. While user interaction is required to download the .pdf file, visual obfuscation can conceal the download trigger. Viewing the email in HTML mode is enough to load external content. This vulnerability affects Thunderbird < 128.10.1 and Thunderbird < 138.0.1. Added Reference https://bugzilla.mozilla.org/show_bug.cgi?id=1958580 Added Reference https://www.mozilla.org/security/advisories/mfsa2025-34/ Added Reference https://www.mozilla.org/security/advisories/mfsa2025-35/
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-3877 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-3877
weaknesses.