Keeler

**Name of the Vulnerable Software and Affected Versions** Mozilla Network Security Services (NSS) versions prior to 3.19.2.1 Mozilla Network Security Services (NSS) versions 3.20.x prior to 3.20.1 Firefox versions prior to 42.0 Firefox ESR 38.x versions prior to 38.4 **Description** The issue is caused by a heap-based buffer overflow in the ASN.1 decoder. This can be exploited by remote attackers using specially crafted OCTET STRING data, potentially leading to a denial of service or the execution of arbitrary code. **Recommendations** For Mozilla Network Security Services (NSS) versions prior to 3.19.2.1, update to version 3.19.2.1 or later. For Mozilla Network Security Services (NSS) versions 3.20.x prior to 3.20.1, update to version 3.20.1 or later. For Firefox versions prior to 42.0, update to version 42.0 or later. For Firefox ESR 38.x versions prior to 38.4, update to version 38.4 or later.

**Name of the Vulnerable Software and Affected Versions** Mozilla Firefox versions prior to 39.0 Firefox ESR versions prior to 38.1 Thunderbird versions prior to 38.1 **Description** The issue allows user-assisted man-in-the-middle attackers to bypass intended access restrictions. This can be achieved by triggering a user dialog for an X.509 certificate problem, such as an expired certificate or a mismatched hostname for a domain with pinning enabled. **Recommendations** For Mozilla Firefox versions prior to 39.0, update to version 39.0 or later to resolve the issue. For Firefox ESR versions prior to 38.1, update to version 38.1 or later to resolve the issue. For Thunderbird versions prior to 38.1, update to version 38.1 or later to resolve the issue.