CVE-2025-2830: Vulnerability in Mozilla Thunderbird
By crafting a malformed file name for an attachment in a multipart message, an attacker can trick Thunderbird into including a directory listing of /tmp when the message is forwarded or edited as a new message. This vulnerability could allow attackers to disclose sensitive information from the victim's system. This vulnerability is not limited to Linux; similar behavior has been observed on Windows as well. This vulnerability was fixed in Thunderbird 137.0.2 and Thunderbird 128.9.2.
AI Analysis
Technical Summary
The vulnerability CVE-2025-2830 in Mozilla Thunderbird involves improper handling of attachment file names in multipart messages. By crafting a malformed file name, an attacker can cause Thunderbird to include a directory listing of the /tmp directory when the message is forwarded or edited as a new message. This behavior is not limited to Linux systems; similar effects have been observed on Windows. The vulnerability allows disclosure of potentially sensitive information from the victim's system. Mozilla addressed this issue with official fixes in Thunderbird 137.0.2 and Thunderbird ESR 128.9.2. The vulnerability is tracked under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory).
Potential Impact
Successful exploitation of this vulnerability can lead to information disclosure, specifically the exposure of directory listings from the /tmp directory on Linux and similar directories on Windows. This could reveal sensitive files or data to an attacker. The CVSS 3.1 base score is 6.3, indicating a medium severity impact with confidentiality, integrity, and availability impacts rated as low to medium. There are no reports of active exploitation in the wild.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Thunderbird versions 137.0.2 and 128.9.2 (ESR). Users and administrators should update to these versions or later to remediate the issue. Since the vulnerability is fixed in these releases, no additional mitigation steps are required beyond applying the official patches.
CVE-2025-2830: Vulnerability in Mozilla Thunderbird
Description
By crafting a malformed file name for an attachment in a multipart message, an attacker can trick Thunderbird into including a directory listing of /tmp when the message is forwarded or edited as a new message. This vulnerability could allow attackers to disclose sensitive information from the victim's system. This vulnerability is not limited to Linux; similar behavior has been observed on Windows as well. This vulnerability was fixed in Thunderbird 137.0.2 and Thunderbird 128.9.2.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2025-2830 in Mozilla Thunderbird involves improper handling of attachment file names in multipart messages. By crafting a malformed file name, an attacker can cause Thunderbird to include a directory listing of the /tmp directory when the message is forwarded or edited as a new message. This behavior is not limited to Linux systems; similar effects have been observed on Windows. The vulnerability allows disclosure of potentially sensitive information from the victim's system. Mozilla addressed this issue with official fixes in Thunderbird 137.0.2 and Thunderbird ESR 128.9.2. The vulnerability is tracked under CWE-22 (Improper Limitation of a Pathname to a Restricted Directory).
Potential Impact
Successful exploitation of this vulnerability can lead to information disclosure, specifically the exposure of directory listings from the /tmp directory on Linux and similar directories on Windows. This could reveal sensitive files or data to an attacker. The CVSS 3.1 base score is 6.3, indicating a medium severity impact with confidentiality, integrity, and availability impacts rated as low to medium. There are no reports of active exploitation in the wild.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Thunderbird versions 137.0.2 and 128.9.2 (ESR). Users and administrators should update to these versions or later to remediate the issue. Since the vulnerability is fixed in these releases, no additional mitigation steps are required beyond applying the official patches.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2025-03-26T18:56:39.784Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2025-26/","vendor":"Mozilla"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-27/","vendor":"Mozilla"}]
Threat ID: 69dd057b82d89c981f0174d3
Added to database: 4/13/2026, 3:02:19 PM
Last enriched: 4/13/2026, 3:18:23 PM
Last updated: 4/13/2026, 5:10:13 PM
Views: 3
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