FastNetMon FastNetMon Community Edition up to 1.2.9 Packet Capture Interface simple_packet_parser_ng.cpp get_ihl out-of-bounds

Summaryinfo

A vulnerability classified as problematic was found in FastNetMon FastNetMon Community Edition up to 1.2.9. This vulnerability affects the function get_ihl of the file src/simple_packet_parser_ng.cpp of the component Packet Capture Interface. Executing a manipulation can lead to out-of-bounds. The identification of this vulnerability is CVE-2026-48682. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic was found in FastNetMon FastNetMon Community Edition up to 1.2.9. This vulnerability affects the function get_ihl of the file src/simple_packet_parser_ng.cpp of the component Packet Capture Interface. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality. CVE summarizes:

FastNetMon Community Edition through 1.2.9 contains an out-of-bounds read in the IPv4 packet parser. In src/simple_packet_parser_ng.cpp, after validating that the packet contains at least sizeof(ipv4_header_t) bytes (20 bytes), the code advances the local_pointer by '4 * ipv4_header->get_ihl()' (line 164) without validating that (a) IHL >= 5 (the minimum valid value per RFC 791), or (b) 4 * IHL bytes are actually available in the packet. The IHL field is 4 bits, allowing values 0-15, so the advance can be 0-60 bytes. An IHL value of 15 with only 20 bytes validated causes a 40-byte over-read. An IHL of 0-4 causes the pointer to not advance past the IP header, resulting in the TCP/UDP header being parsed from IP header data (type confusion). This vulnerability is reachable via any packet capture interface.

The advisory is available at github.com. This vulnerability was named CVE-2026-48682 since 05/22/2026. The exploitation appears to be easy. Technical details are known, but there is no available exploit.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• FastNetMon

Name

• FastNetMon Community Edition

Version

• 1.2.0
• 1.2.1
• 1.2.2
• 1.2.3
• 1.2.4
• 1.2.5
• 1.2.6
• 1.2.7
• 1.2.8
• 1.2.9

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Discussion