The US Cybersecurity and Infrastructure Security Agency (CISA) has added a zero-day flaw affecting Microsoft’s .NET and Visual Studio products to its Known Exploited Vulnerabilities Catalog.
The vulnerability, tracked as CVE-2023-38180, was fixed by Microsoft with its August 2023 Patch Tuesday updates, which also address CVE-2023-36884, an Office vulnerability exploited by Russian threat actors.
CVE-2023-38180 can be exploited for denial-of-service (DoS) attacks, and Microsoft noted in its advisory that it’s aware of malicious exploitation. No details are available on the attacks leveraging the vulnerability.
Microsoft’s advisory reveals that remote exploitation is possible and no user interaction or privileges are required.
The vulnerability has been assigned an ‘important’ severity rating and a CVSS score of 7.5 (high severity). According to Microsoft, it impacts Visual Studio 2022 versions 17.2, 17.4 and 17.6, as well as .NET 6.0 and 7.0, and ASP.NET Core 2.1.
CISA has added CVE-2023-38180 to its so-called ‘must patch’ list, instructing government organizations to apply patches or mitigations by August 30, as per Binding Operational Directive 22-01.
CISA’s catalog also includes a few other exploited vulnerabilities affecting .NET and/or Visual Studio.
Related: Microsoft SmartScreen Zero-Day Exploited to Deliver Magniber Ransomware
Related: Microsoft Warns of Office Zero-Day Attacks, No Patch Available
Related: Microsoft Patch Tuesday: 40 Vulnerabilities, 2 Zero-Days
Eduard Kovacs (@EduardKovacs) is a managing editor at SecurityWeek. He worked as a high school IT teacher for two years before starting a career in journalism as Softpedia’s security news reporter. Eduard holds a bachelor’s degree in industrial informatics and a master’s degree in computer techniques applied in electrical engineering.
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