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Microsoft has revised the severity of a security vulnerability it originally patched in September 2022, upgrading it to “Critical” after it emerged that it could be exploited to achieve remote code execution.

Tracked as CVE-2022-37958 (CVSS score: 8.1), the flaw was previously described as an information disclosure vulnerability in SPNEGO Extended Negotiation (NEGOEX) Security Mechanism.

SPNEGO, short for Simple and Protected GSSAPI Negotiation Mechanism (SPNEGO), is a scheme that allows a client and remote server to arrive at a consensus on the choice of the protocol to be used (e.g., Kerberos or NTLM) for authentication.

But a further analysis of the flaw by IBM Security X-Force researcher Valentina Palmiotti found that it could allow remote execution of arbitrary code, prompting Microsoft to reclassify its severity.

images from Hacker News