The threat actor responsible for the SolarWinds attack accessed certain Mimecast-issued certificates and related customer server connection information. ("Social Media Breakfast at Mimecast #SMB32" by stevegarfield is licensed under CC BY-NC-SA 2.0)

Mimecast acknowledged Wednesday that the threat actor responsible for the SolarWinds attack used the supply chain compromise to gain entry to a part of Mimecast’s production grid environment, accessing certain Mimecast-issued certificates and related customer server connection information.

In an incident report, Mimecast researchers said the threat actor also accessed a subset of email addresses and other contact information, as well as encrypted and/or hashed and salted credentials. The company said the threat actor also accessed and downloaded a limited number of its source code repositories, but Mimecast found no evidence of any modifications to its source code nor does it believe there was any significant impact on any Mimecast products.

Please register to continue.

Already registered? Log in.

Once you register, you'll receive:

  • News analysis

    The context and insight you need to stay abreast of the most important developments in cybersecurity. CISO and practitioner perspectives; strategy and tactics; solutions and innovation; policy and regulation.

  • Archives

    Unlimited access to nearly 20 years of SC Media industry analysis and news-you-can-use.

  • Daily Newswire

    SC Media’s essential morning briefing for cybersecurity professionals.

  • Learning Express

    One-click access to our extensive program of virtual events, with convenient calendar reminders and ability to earn CISSP credits.