Mozilla Network Security Services (NSS) before 3.19, as used in Mozilla Firefox before 39.0, Firefox ESR 31.x before 31.8 and 38.x before 38.1, Thunderbird before 38.1, and other products, does not properly determine state transitions for the TLS state machine, which allows man-in-the-middle attackers to defeat cryptographic protection mechanisms by blocking messages, as demonstrated by removing a forward-secrecy property by blocking a ServerKeyExchange message, aka a "SMACK SKIP-TLS" issue.
CVE-2015-2721 is a security vulnerability that . Impacting 11 products from novell, from canonical, from debian and 8 others, organizations running these solutions should prioritize assessment and patching.
First disclosed in 2015, this vulnerability was reported during a period defined by widespread IoT adoption challenges, mobile security concerns, and the emergence of advanced persistent threat (APT) techniques. Contemporary mitigation strategies focused on secure development practices and third-party component vetting.
2015-07-06T02:00:49.283
2025-04-12T10:46:40.837
Deferred
CVSSv2: 4.3 (MEDIUM)
AV:N/AC:M/Au:N/C:N/I:P/A:N
8.6
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | novell | suse_linux_enterprise_software_development_kit | 12.0 | Yes |
| Operating System | canonical | ubuntu_linux | 12.04 | Yes |
| Operating System | canonical | ubuntu_linux | 14.04 | Yes |
| Operating System | canonical | ubuntu_linux | 14.10 | Yes |
| Operating System | canonical | ubuntu_linux | 15.04 | Yes |
| Operating System | debian | debian_linux | 7.0 | Yes |
| Operating System | debian | debian_linux | 8.0 | Yes |
| Operating System | novell | suse_linux_enterprise_desktop | 12.0 | Yes |
| Operating System | novell | suse_linux_enterprise_server | 11 | Yes |
| Operating System | novell | suse_linux_enterprise_server | 12.0 | Yes |
| Application | mozilla | network_security_services | 3.19 | Yes |
| Application | mozilla | firefox | ≤ 38.1.0 | No |
| Application | mozilla | firefox | 31.0 | No |
| Application | mozilla | firefox | 31.1.0 | No |
| Application | mozilla | firefox | 31.1.1 | No |
| Application | mozilla | firefox | 31.3.0 | No |
| Application | mozilla | firefox | 31.5.1 | No |
| Application | mozilla | firefox | 31.5.2 | No |
| Application | mozilla | firefox | 31.5.3 | No |
| Application | mozilla | firefox | 38.0 | No |
| Application | mozilla | firefox_esr | 31.1 | No |
| Application | mozilla | firefox_esr | 31.2 | No |
| Application | mozilla | firefox_esr | 31.3 | No |
| Application | mozilla | firefox_esr | 31.4 | No |
| Application | mozilla | firefox_esr | 31.5 | No |
| Application | mozilla | firefox_esr | 31.6.0 | No |
| Application | mozilla | firefox_esr | 31.7.0 | No |
| Application | mozilla | thunderbird | ≤ 38.0.1 | No |
| Operating System | oracle | solaris | 11.3 | Yes |
| Operating System | oracle | vm_server | 3.2 | 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 novell'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.