CVE-2020-27174 json
In Amazon AWS Firecracker before 0.21.3, and 0.22.x before 0.22.1, the serial console buffer can grow its memory usage without limit when d…
published 2020-10-16 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-19698
- cvss
- 7.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.7%
- EPSS 1.7% chance of exploitation in 30 days, percentile 77%
- public exploits
- 0
- none known
Summary
In Amazon AWS Firecracker before 0.21.3, and 0.22.x before 0.22.1, the serial console buffer can grow its memory usage without limit when data is sent to the standard input. This can result in a memory leak on the microVM emulation thread, possibly occupying more memory than intended on the host.
Patch / fix
- amazon firecracker 0.21.3, 0.22.1
- github.com/firecracker-microvm/firecracker#2178 pull request
- github.com/firecracker-microvm/firecracker#2179 pull request
Exploit prediction
1.74% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
Classification
- Weakness
-
- CWE-401 Missing Release of Memory after Effective Lifetime
References
-
github.com
/firecracker-microvm/firecracker/pull/2178
patch, third-party-advisory
-
github.com
/firecracker-microvm/firecracker/pull/2179
patch, third-party-advisory
-
github.com
/firecracker-microvm/firecracker/issues/2177
third-party-advisory
-
openwall.com
/lists/oss-security/2020/10/23/1
mailing-list, third-party-advisory
Sources
- CVE List CVE-2020-27174
- NVD CVE-2020-27174
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