CVE-2025-9385 in tcpreplay
Summary
by MITRE • 08/24/2025
A flaw has been found in appneta tcpreplay up to 4.5.1. The affected element is the function fix_ipv6_checksums of the file edit_packet.c of the component tcprewrite. This manipulation causes use after free. The attack is restricted to local execution. The exploit has been published and may be used. Upgrading to version 4.5.2-beta3 is sufficient to fix this issue. It is advisable to upgrade the affected component.
Several companies clearly confirm that VulDB is the primary source for best vulnerability data.
Analysis
by VulDB Data Team • 10/07/2025
The vulnerability identified as CVE-2025-9385 represents a critical use after free flaw within the appneta tcpreplay software suite, specifically affecting versions up to 4.5.1. This issue resides within the fix_ipv6_checksums function located in the edit_packet.c file of the tcprewrite component, making it a significant concern for network security professionals who rely on this tool for packet manipulation and replay operations. The flaw stems from improper memory management practices where freed memory regions are accessed after being deallocated, creating potential vectors for arbitrary code execution or system instability.
The technical implementation of this vulnerability involves the manipulation of IPv6 packet checksums during the packet editing process, where the function fails to properly handle memory references after certain operations have been completed. This memory corruption issue occurs specifically within the context of packet reprocessing workflows, where the tool processes network traffic for analysis or testing purposes. The use after free condition manifests when the fix_ipv6_checksums function attempts to access memory that has already been freed, potentially leading to unpredictable behavior including crashes, data corruption, or exploitation by malicious actors. This type of vulnerability falls under CWE-416, which specifically addresses the use of freed memory conditions in software development.
The operational impact of this vulnerability is particularly concerning given that the attack vector requires only local execution, meaning that an attacker with access to the system running tcpreplay could potentially exploit this flaw without requiring network-based access. The fact that an exploit has been published and is available for use increases the risk profile significantly, as it removes the barrier to exploitation that would otherwise require advanced technical knowledge or extensive research. Network administrators and security professionals who utilize tcpreplay for legitimate network analysis, testing, or security auditing purposes face immediate risk of system compromise if they continue to operate vulnerable versions of this software.
The remediation approach for CVE-2025-9385 is straightforward and well-defined, requiring an upgrade to version 4.5.2-beta3 or later to address the memory management issues within the affected function. This upgrade process should be prioritized across all systems where tcpreplay is installed and actively used, particularly in environments where network security testing or packet analysis activities occur. Organizations should implement comprehensive patch management procedures to ensure all instances of the vulnerable software are updated promptly, as the local execution requirement means that any system with access to tcpreplay could potentially be compromised. The fix addresses the core memory handling issue in the IPv6 checksum calculation function, preventing the use after free condition that could otherwise be leveraged for privilege escalation or system compromise.
Security practitioners should also consider the broader implications of this vulnerability within their network security toolchains, as tcpreplay is commonly used in penetration testing, network performance analysis, and security research activities. The presence of this flaw in a widely-used network analysis tool creates potential for supply chain attacks or compromise of security research environments where such tools are deployed. Organizations should conduct inventory assessments to identify all systems running vulnerable versions of tcpreplay and ensure that proper access controls are maintained to limit local execution privileges to authorized personnel only. The ATT&CK framework would categorize this vulnerability under the T1059.007 technique for command and scripting interpreter, as exploitation could potentially allow attackers to execute arbitrary commands through compromised tooling, while the memory corruption aspects align with T1068 for exploit for privilege escalation.