Mozilla Network Security Services (NSS) before 3.12.3, Firefox before 3.0.13, Thunderbird before 2.0.0.23, and SeaMonkey before 1.1.18 do not properly handle a '\0' character in a domain name in the subject's Common Name (CN) field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority. NOTE: this was originally reported for Firefox before 3.5.
This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.9, indicating it can be exploited remotely over the network but requires specific conditions to be met without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts integrity (unauthorized modifications), for affected systems. Impacting 9 products from mozilla, from mozilla, from mozilla and 6 others, organizations running these solutions should prioritize assessment and patching.
Originally identified in 2009, this vulnerability predates many modern security frameworks and practices. The vulnerability landscape of that era was characterized by different threat models and less mature defense mechanisms compared to contemporary standards.
2009-07-30T19:30:00.313
2025-04-09T00:30:58.490
Deferred
CVSSv3.1: 5.9 (MEDIUM)
AV:N/AC:M/Au:N/C:P/I:P/A:P
8.6
6.4
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | mozilla | firefox | < 3.0.13 | Yes |
| Application | mozilla | network_security_services | < 3.12.3 | Yes |
| Application | mozilla | seamonkey | < 1.1.18 | Yes |
| Application | mozilla | thunderbird | < 2.0.0.23 | Yes |
| Operating System | opensuse | opensuse | ≤ 11.1 | Yes |
| Operating System | suse | linux_enterprise | 10.0 | Yes |
| Operating System | suse | linux_enterprise | 11.0 | Yes |
| Operating System | suse | linux_enterprise_server | 9 | Yes |
| Operating System | debian | debian_linux | 5.0 | Yes |
| Operating System | canonical | ubuntu_linux | 8.04 | Yes |
| Operating System | canonical | ubuntu_linux | 8.10 | Yes |
| Operating System | canonical | ubuntu_linux | 9.04 | Yes |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For mozilla's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.