CVE-2025-62820
Description
A flaw was found in Slack Nebula. An improper CIDR construction in the hostmap logic makes the inbound firewall overly permissive for nodes with certificates allowing subnets or multiple IPs. An attacker controlling such a node can send packets with arbitrary source IP addresses within the network. This allows the attacker to impersonate other nodes, disrupt traffic via TCP RST packets, or send arbitrary UDP packets.
Statement
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery. For more information about this vulnerability and the products it affects, please see the linked references.
Understanding the Weakness (CWE)
Access Control
Technical Impact: Gain Privileges or Assume Identity; Bypass Protection Mechanism
Frequently Asked Questions
Not sure what something means? Check out our Security Glossary.
Want to get errata notifications? Sign up here.
