CVE-2025-9386
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-08-24

Last updated on: 2026-04-29

Assigner: VulDB

Description
A vulnerability has been found in appneta tcpreplay up to 4.5.1. The impacted element is the function get_l2len_protocol of the file get.c of the component tcprewrite. Such manipulation leads to use after free. The attack must be carried out locally. The exploit has been disclosed to the public and may be used. Upgrading to version 4.5.2-beta3 is sufficient to resolve this issue. You should upgrade the affected component.
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Meta Information
Published
2025-08-24
Last Modified
2026-04-29
Generated
2026-06-16
AI Q&A
2025-08-24
EPSS Evaluated
2026-06-14
NVD
CVE-2025-9386
EUVD
EUVD-2025-25642
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
broadcom tcpreplay to 4.5.1 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
CWE-416 The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.
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Executive Summary

CVE-2025-9386 is a use-after-free vulnerability in the AppNeta tcpreplay tool, specifically in the get_l2len_protocol function of the tcprewrite component. This flaw occurs when the function accesses memory that has already been freed after a packet buffer is resized, leading to referencing invalid memory. This can cause program crashes, unexpected behavior, or potentially arbitrary code execution. The attack requires local access and is exploitable with publicly available proof-of-concept code. Upgrading to version 4.5.2-beta3 fixes the issue. [1, 2, 3]

Impact Analysis

This vulnerability can impact you by causing crashes or unexpected behavior in the tcpreplay tool, potentially leading to denial of service or arbitrary code execution on the affected system. It affects the confidentiality, integrity, and availability of the system where tcpreplay is used. Since the exploit requires local access, an attacker with limited privileges could exploit this to escalate impact. The vulnerability has moderate severity and is exploitable with publicly available proof-of-concept code. [1, 2]

Detection Guidance

This vulnerability can be detected by reproducing the use-after-free condition using a proof-of-concept malformed packet capture file named POC_tcprewrite_protocol_length_use_after_free_360. To detect it, compile tcprewrite with AddressSanitizer enabled and run the following command: tcprewrite --fixlen pad -i POC_tcprewrite_protocol_length_use_after_free_360 -o /dev/null. If the program crashes with a heap use-after-free error in get_l2len_protocol, the vulnerability is present. [2, 3]

Mitigation Strategies

The immediate mitigation step is to upgrade the affected tcpreplay component to version 4.5.2-beta3 or later, which resolves the use-after-free vulnerability in the get_l2len_protocol function. [1]

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