Path Traversal in Mozilla Thunderbird
CVE-2025-2830
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L.
EPSS exploit prediction
EPSS: 0.004 (26.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 26th percentile — 26.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.000
Affected products
- Mozilla Thunderbird — versions 128.9.2, 137.0.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
- www.mozilla.org/security/advisories/mfsa2025-26/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-27/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-2830?
- CVE-2025-2830 is a medium-severity vulnerability in Mozilla Thunderbird, classified under Path Traversal. CVSS score: 6.3/10. Published 2025-04-15.
- How severe is CVE-2025-2830?
- Medium severity. CVSS v3 base score is 6.3 out of 10.
- Is CVE-2025-2830 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.