The alert about new Exchange bugs come soon after on-premises Exchange customers were told to patch against a campaign actively exploiting a zero-day vulnerability. (Jeenah Moon/Getty Images)

Microsoft suggested that on-premises Exchange customers install fixes "as soon as possible" to mitigate newly patched critical vulnerabilities.

"We have not seen the vulnerabilities used in attacks against our customers. However, given recent adversary focus on exchange, we recommend customers install the updates as soon as possible to ensure they remain protected from these and other threats," Microsoft writes in a blog post.

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