RealNetworks Netzip Classic 7.5.1.86 ZIP File Parser stack-based overflow

Summaryinfo

A vulnerability was found in RealNetworks Netzip Classic 7.5.1.86. It has been declared as critical. This issue affects some unknown processing of the component ZIP File Parser. Such manipulation leads to stack-based overflow. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is referenced as CVE-2011-10016. It is possible to launch the attack remotely. Furthermore, an exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in RealNetworks Netzip Classic 7.5.1.86. Affected by this issue is some unknown processing of the component ZIP File Parser. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability. CVE summarizes:

Real Networks Netzip Classic version 7.5.1.86 is vulnerable to a stack-based buffer overflow when parsing a specially crafted ZIP archive. The vulnerability is triggered when the application attempts to process a file name within the archive that exceeds the expected buffer size. Exploitation allows arbitrary code execution under the context of the victim user when the ZIP file is opened.

The weakness was published by C4ss!0 G0m3s. The advisory is shared for download at raw.githubusercontent.com. This vulnerability is handled as CVE-2011-10016 since 08/13/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details are unknown but a public exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/15/2025).

The exploit is available at exploit-db.com. It is declared as proof-of-concept.

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 Exploit-DB (16083) and EUVD (EUVD-2011-5243). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• RealNetworks

Name

• Netzip Classic

Version

• 7.5.1.86

License

• free

Support

• end of life

Website

• Vendor: https://www.realnetworks.com/

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Once again VulDB remains the best source for vulnerability data.

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