simsong tcpflow up to 1.61 wifipcap handle_beacon out-of-bounds write

Summaryinfo

A vulnerability, which was classified as critical, has been found in simsong tcpflow up to 1.61. The impacted element is the function handle_beacon of the component wifipcap. Performing a manipulation results in out-of-bounds write. This vulnerability is cataloged as CVE-2026-25061. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in simsong tcpflow up to 1.61. This affects the function handle_beacon of the component wifipcap. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on availability. The summary by CVE is:

tcpflow is a TCP/IP packet demultiplexer. In versions up to and including 1.61, wifipcap parses 802.11 management frame elements and performs a length check on the wrong field when handling the TIM element. A crafted frame with a large TIM length can cause a 1-byte out-of-bounds write past `tim.bitmap[251]`. The overflow is small and DoS is the likely impact; code execution is potential, but still up in the air. The affected structure is stack-allocated in `handle_beacon()` and related handlers. As of time of publication, no known patches are available.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-25061 since 01/28/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 02/26/2026).

The vulnerability scanner Nessus provides a plugin with the ID 297265 (Linux Distros Unpatched Vulnerability : CVE-2026-25061), which helps to determine the existence of the flaw in a target environment.

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

The vulnerability is also documented in the databases at Tenable (297265) and EUVD (EUVD-2026-4944). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• simsong

Name

• tcpflow

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24
• 1.25
• 1.26
• 1.27
• 1.28
• 1.29
• 1.30
• 1.31
• 1.32
• 1.33
• 1.34
• 1.35
• 1.36
• 1.37
• 1.38
• 1.39
• 1.40
• 1.41
• 1.42
• 1.43
• 1.44
• 1.45
• 1.46
• 1.47
• 1.48
• 1.49
• 1.50
• 1.51
• 1.52
• 1.53
• 1.54
• 1.55
• 1.56
• 1.57
• 1.58
• 1.59
• 1.60
• 1.61

Website

• Product: https://github.com/simsong/tcpflow/

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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