admin.htm in Geo++ GNCASTER 1.4.0.7 and earlier does not properly enforce HTTP Digest Authentication, which allows remote authenticated users to use HTTP Basic Authentication, bypassing intended server policy.

HTTP authentication implementation in Geo++ GNCASTER 1.4.0.7 and earlier allows remote attackers to read authentication headers of other users via a large request with an incorrect authentication attempt, which includes sensitive memory in the response. NOTE: this is referred to as a "memory leak" by some sources, but is better characterized as "memory disclosure."

Geo++ GNCASTER 1.4.0.7 and earlier allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via multiple requests for a non-existent file using a long URI.

Geo++ GNCASTER 1.4.0.7 and earlier allows remote authenticated users to cause a denial of service (application crash) and possibly execute arbitrary code via a long NMEA data sentence.

The HTTP Authentication implementation in Geo++ GNCASTER 1.4.0.7 and earlier uses the same nonce for all authentication, which allows remote attackers to hijack web sessions or bypass authentication via a replay attack.