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The CVE-2025-13674 vulnerability stems from a flaw in the BPv7 (Bundle Protocol version 7) dissector within Wireshark version 4.6.0. When processing network traffic, the dissector fails to properly handle specially crafted BPv7 packets. This occurs due to insufficient validation of packet fields, such as bundle blocks or headers. Specifically, the dissector may attempt to dereference null pointers or access memory out of bounds when parsing malformed data. The issue arises in the epan/dissectors/packet-bp7.c file where edge cases are not managed. Attackers can exploit this by injecting malicious BPv7 packets into network traffic or by creating a crafted pcap file. When Wireshark analyzes such packets, either via live capture or file opening, the dissector triggers an assertion failure or segmentation fault. This causes the Wireshark process to crash abruptly, leading to denial of service. The crash disrupts network analysis and troubleshooting activities. The vulnerability is particularly relevant in delay-tolerant networking (DTN) environments using BPv7. No user interaction is required beyond capturing traffic or loading a file. The flaw was reported to the Wireshark development team, and a patch is expected to enhance input validation routines in the dissector code.
Platform: Wireshark
Version: 4.6.0
Vulnerability: BPv7 dissector crash
Severity: Critical
Date: 2025-11-26
Prediction: Patch expected 2025-12
What Undercode Say:
bash commands:
wireshark -v
tshark -i any -Y bp7
editcap -r input.pcap output.pcap
codes:
// Malformed BPv7 packet example
struct bp7_bundle {
uint8_t version;
uint8_t data; // Potential null dereference
};
// Patch snippet suggestion
if (bp7_header == NULL) {
return; // Avoid crash
}
How Exploit:
Craft malicious BPv7 packets. Inject into network traffic. Or create malicious pcap file. Open with Wireshark to trigger crash.
Protection from this CVE
Update Wireshark patched version. Avoid untrusted pcap files. Restrict network capture scope.
Impact:
Denial of service. Application crash. Disrupted network analysis.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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