CVE-2007-0042

CVE-2007-0042 is a high-severity vulnerability in Microsoft .net Framework with a CVSS 2.0 base score of 7.8. Its EPSS exploit-prediction score of 78% places it in the 100th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-200.

Key facts

Description

Interpretation conflict in ASP.NET in Microsoft .NET Framework 1.0, 1.1, and 2.0 for Windows 2000, XP, Server 2003, and Vista allows remote attackers to access configuration files and obtain sensitive information, and possibly bypass security mechanisms that try to constrain the final substring of a string, via %00 characters, related to use of %00 as a string terminator within POSIX functions but a data character within .NET strings, aka "Null Byte Termination Vulnerability."

Frequently asked questions

What is CVE-2007-0042?
Interpretation conflict in ASP.NET in Microsoft .NET Framework 1.0, 1.1, and 2.0 for Windows 2000, XP, Server 2003, and Vista allows remote attackers to access configuration files and obtain sensitive information, and possibly bypass security mechanisms that try to constrain the final substring of a string, via %00 characters, related to use of %00 as a string terminator within POSIX functions but a data character within .NET strings, aka "Null Byte Termination Vulnerability."
How severe is CVE-2007-0042?
CVE-2007-0042 has a CVSS 2.0 base score of 7.8, rated high severity.
Is CVE-2007-0042 being actively exploited?
It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 78% (100th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2007-0042?
CVE-2007-0042 primarily affects Microsoft .net Framework. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2007-0042?
Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2007-0042 published?
CVE-2007-0042 was published on 2007-07-10 and last updated on 2026-06-16.

References

Affected products (3)

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