Security News > 2023 > September > Millions of Exim mail servers exposed to zero-day RCE attacks
A critical zero-day vulnerability in all versions of Exim mail transfer agent software can let unauthenticated attackers gain remote code execution on Internet-exposed servers.
MTA servers like Exim are highly vulnerable targets, primarily because they are often accessible via the Internet, serving as easy entry points for attackers into a target's network.
According to the survey, Exim is installed on more than 56% out of a total of 602,000 mail servers reachable on the Internet, representing just over 342,000 Exim servers.
Just over 3.5 million Exim servers are currently exposed online per a Shodan search, most of them in the United States, followed by Russia and Germany.
While a patch is not yet available to secure vulnerable Exim servers against potential attacks, ZDI advised admins to restrict remote access from the Internet to thwart incoming exploitation attempts.
New PaperCut critical bug exposes unpatched servers to RCE attacks.
News URL
Related news
- New scanner finds Linux, UNIX servers exposed to CUPS RCE attacks (source)
- Palo Alto Networks warns of critical RCE zero-day exploited in attacks (source)
- Critical RCE bug in VMware vCenter Server now exploited in attacks (source)
- Rackspace internal monitoring web servers hit by zero-day (source)
- Rackspace monitoring data stolen in ScienceLogic zero-day attack (source)
- 'Patch yesterday': Zimbra mail servers under siege through RCE vuln (source)
- Critical Zimbra RCE flaw exploited to backdoor servers using emails (source)
- Critical Ivanti RCE flaw with public exploit now used in attacks (source)
- Qualcomm patches high-severity zero-day exploited in attacks (source)
- Ivanti warns of three more CSA zero-days exploited in attacks (source)