Microsoft discovers critical SolarWinds zero-day under active attack

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SolarWinds, the company at the center of a supply chain attack that compromised nine US agencies and 100 private companies, is scrambling to contain a new security threat: a critical zero-day vulnerability in its Serv-U product line.

Microsoft discovered the exploits and privately reported them to SolarWinds, the latter company said in an advisory published on Friday. SolarWinds said the attacks are entirely unrelated to the supply chain attack discovered in December.

“Microsoft has provided evidence of limited, targeted customer impact, though SolarWinds does not currently have an estimate of how many customers may be directly affected by the vulnerability,” company officials wrote. “SolarWinds is unaware of the identity of the potentially affected customers.”