CVE-2020-27173

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-10-16 · updated 2026-06-17
Weakness: CWE-770

Description

In vm-superio before 0.1.1, the serial console FIFO can grow to unlimited memory usage when data is sent to the input source (i.e., standard input). This behavior cannot be reproduced from the guest side. When no rate limiting is in place, the host can be subject to memory pressure, impacting all other VMs running on the same host.

Affected products

Vm-Superio Project Vm-Superio: before 0.1.1 — fixed in 0.1.1

How to fix

Upgrade to a fixed version: Vm-Superio Project Vm-Superio 0.1.1. Check the vendor advisory for mitigations.

References

https://github.com/rust-vmm/vm-superio/issues/17
https://github.com/rust-vmm/vm-superio/pull/19
https://github.com/rust-vmm/vm-superio/issues/17
https://github.com/rust-vmm/vm-superio/pull/19

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